HomeDocs changes
Documentation changes
What the docs quietly changed.
Anthropic's published documentation, fetched on a schedule and diffed against the last copy. Every edit dated, including the ones that never made a release note.
Last poll read all 4 cleanly: Claude Code CLI, Claude Developer Platform, Claude Documentation, Model Context Protocol. A date here is when this site noticed, not when Anthropic edited.
Claude Developer Platform
821pages tracked
774 changed this week · last read 23 Oct 2026
Claude Code CLI
228pages tracked
148 changed this week · last read 23 Oct 2026
Claude Documentation
280pages tracked
81 changed this week · last read 23 Oct 2026
Model Context Protocol
357pages tracked
171 changed this week · last read 23 Oct 2026
100 on this page
10,119 of the ledger's changes in api. Show every change
ReadSourcePageWhatLines
23 Sep 2026
282 pages
+95953 −37143 lines
api
api/beta/models/retrieve
±changed
+5−1
apichanged
api/beta/models/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/models/list
±changed
+5−1
apichanged
api/beta/models/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/models
±changed
+10−2
apichanged
api/beta/models
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+10 −2 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages/create
±changed
+4342−2068
apichanged
api/beta/messages/create
No line of the body moved in this read.
+4342 −2068 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages/count_tokens
±changed
+2171−1991
apichanged
api/beta/messages/count_tokens
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+2171 −1991 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages/batches/retrieve
±changed
+5−1
apichanged
api/beta/messages/batches/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages/batches/results
±changed
+2168−77
apichanged
api/beta/messages/batches/results
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+2168 −77 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages/batches/list
±changed
+5−1
apichanged
api/beta/messages/batches/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages/batches/delete
±changed
+5−1
apichanged
api/beta/messages/batches/delete
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages/batches/create
±changed
+2171−1991
apichanged
api/beta/messages/batches/create
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+2171 −1991 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages/batches/cancel
±changed
+5−1
apichanged
api/beta/messages/batches/cancel
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages/batches
±changed
+10848−2300
apichanged
api/beta/messages/batches
No line of the body moved in this read.
+10848 −2300 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/messages
±changed
+41022−6884
apichanged
api/beta/messages
No line of the body moved in this read.
+41022 −6884 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/update
±changed
+5−1
apichanged
api/beta/memory_stores/update
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/retrieve
±changed
+5−1
apichanged
api/beta/memory_stores/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memory_versions/retrieve
±changed
+5−1
apichanged
api/beta/memory_stores/memory_versions/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memory_versions/redact
±changed
+5−1
apichanged
api/beta/memory_stores/memory_versions/redact
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memory_versions/list
±changed
+5−1
apichanged
api/beta/memory_stores/memory_versions/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memory_versions
±changed
+15−3
apichanged
api/beta/memory_stores/memory_versions
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+15 −3 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memories/update
±changed
+5−1
apichanged
api/beta/memory_stores/memories/update
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memories/retrieve
±changed
+5−1
apichanged
api/beta/memory_stores/memories/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memories/list
±changed
+5−1
apichanged
api/beta/memory_stores/memories/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memories/delete
±changed
+5−1
apichanged
api/beta/memory_stores/memories/delete
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memories/create
±changed
+5−1
apichanged
api/beta/memory_stores/memories/create
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/memories
±changed
+25−5
apichanged
api/beta/memory_stores/memories
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+25 −5 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/list
±changed
+5−1
apichanged
api/beta/memory_stores/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/delete
±changed
+5−1
apichanged
api/beta/memory_stores/delete
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/create
±changed
+5−1
apichanged
api/beta/memory_stores/create
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores/archive
±changed
+5−1
apichanged
api/beta/memory_stores/archive
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/memory_stores
±changed
+70−14
apichanged
api/beta/memory_stores
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+70 −14 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/files/upload
±changed
+5−1
apichanged
api/beta/files/upload
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/files/retrieve_metadata
±changed
+5−1
apichanged
api/beta/files/retrieve_metadata
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/files/list
±changed
+5−1
apichanged
api/beta/files/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/files/download
±changed
+5−1
apichanged
api/beta/files/download
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/files/delete
±changed
+5−1
apichanged
api/beta/files/delete
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/files
±changed
+25−5
apichanged
api/beta/files
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+25 −5 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/work/update
±changed
+5−1
apichanged
api/beta/environments/work/update
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/work/stop
±changed
+5−1
apichanged
api/beta/environments/work/stop
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/work/stats
±changed
+5−1
apichanged
api/beta/environments/work/stats
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/work/retrieve
±changed
+5−1
apichanged
api/beta/environments/work/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/work/poll
±changed
+5−1
apichanged
api/beta/environments/work/poll
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/work/list
±changed
+5−1
apichanged
api/beta/environments/work/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/work/heartbeat
±changed
+5−1
apichanged
api/beta/environments/work/heartbeat
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/work/ack
±changed
+5−1
apichanged
api/beta/environments/work/ack
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/work
±changed
+40−8
apichanged
api/beta/environments/work
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+40 −8 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/update
±changed
+5−1
apichanged
api/beta/environments/update
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/retrieve
±changed
+5−1
apichanged
api/beta/environments/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/list
±changed
+5−1
apichanged
api/beta/environments/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/delete
±changed
+5−1
apichanged
api/beta/environments/delete
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/create
±changed
+5−1
apichanged
api/beta/environments/create
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments/archive
±changed
+5−1
apichanged
api/beta/environments/archive
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/environments
±changed
+70−14
apichanged
api/beta/environments
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+70 −14 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/dreams/retrieve
±changed
+5−1
apichanged
api/beta/dreams/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/dreams/list
±changed
+5−1
apichanged
api/beta/dreams/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/dreams/create
±changed
+5−1
apichanged
api/beta/dreams/create
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/dreams/cancel
±changed
+5−1
apichanged
api/beta/dreams/cancel
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/dreams/archive
±changed
+5−1
apichanged
api/beta/dreams/archive
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/dreams
±changed
+25−5
apichanged
api/beta/dreams
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+25 −5 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployments/update
±changed
+5−1
apichanged
api/beta/deployments/update
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployments/unpause
±changed
+5−1
apichanged
api/beta/deployments/unpause
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployments/run
±changed
+5−1
apichanged
api/beta/deployments/run
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployments/retrieve
±changed
+5−1
apichanged
api/beta/deployments/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployments/pause
±changed
+5−1
apichanged
api/beta/deployments/pause
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployments/list
±changed
+5−1
apichanged
api/beta/deployments/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployments/create
±changed
+5−1
apichanged
api/beta/deployments/create
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployments/archive
±changed
+5−1
apichanged
api/beta/deployments/archive
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployments
±changed
+40−8
apichanged
api/beta/deployments
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+40 −8 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployment_runs/retrieve
±changed
+5−1
apichanged
api/beta/deployment_runs/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployment_runs/list
±changed
+5−1
apichanged
api/beta/deployment_runs/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+5 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/deployment_runs
±changed
+10−2
apichanged
api/beta/deployment_runs
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
+10 −2 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/agents/versions/list
±changed
+10−2
apichanged
api/beta/agents/versions/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+10 −2 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/agents/versions
±changed
+10−2
apichanged
api/beta/agents/versions
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+10 −2 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/agents/update
±changed
+16−4
apichanged
api/beta/agents/update
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+16 −4 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/agents/retrieve
±changed
+10−2
apichanged
api/beta/agents/retrieve
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+10 −2 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/agents/list
±changed
+10−2
apichanged
api/beta/agents/list
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+10 −2 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/agents/create
±changed
+16−4
apichanged
api/beta/agents/create
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+16 −4 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/agents/archive
±changed
+10−2
apichanged
api/beta/agents/archive
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+10 −2 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta/agents
±changed
+98−22
apichanged
api/beta/agents
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
- `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
- `"inline-tools-2026-09-15"`
- `"mcp-client-2026-09-15"`
+98 −22 lines
Recorded here 23 Sep 2026 18:37 UTC
api
api/beta
±changed
+11744−6339
apichanged
api/beta
No line of the body moved in this read.
+11744 −6339 lines
Recorded here 23 Sep 2026 18:37 UTC
api
agents-and-tools/tool-use/web-fetch-tool
±changed
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apichanged
agents-and-tools/tool-use/web-fetch-tool
To minimize exfiltration risks, Claude cannot fetch URLs that appear only in its own output. Claude can only fetch URLs that have previously appeared in the conversation: URLs in
To minimize exfiltration risks, Claude cannot fetch URLs that appear only in its own output. Claude can only fetch URLs that have previously appeared in the conversation: URLs in
However, there is still residual risk that you should carefully consider when using this tool.
* `url_not_allowed`: URL blocked by domain filtering rules (including your organization's settings) or by Anthropic-side restrictions, such as private addresses and `robots.txt`
+6 −2 lines
Recorded here 23 Sep 2026 18:37 UTC
api
agents-and-tools/tool-use/tool-runner
±changed
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apichanged
agents-and-tools/tool-use/tool-runner
For long-running agentic tasks, the TypeScript and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#client-sid
For long-running agentic tasks, the TypeScript and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#client-sid
+1 −1 lines
Recorded here 23 Sep 2026 18:37 UTC
api
agents-and-tools/tool-use/overview
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apichanged
agents-and-tools/tool-use/overview
| Model | Tool choice | Tool use
| ------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------ | ---------
| Claude Opus 5.5 | `auto`, `none` | 286 token
| Claude Opus 5 | `auto`, `none`***`any`, `tool` | 286 token
| Claude Opus 4.8 | `auto`, `none`***`any`, `tool` | 290 token
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Recorded here 23 Sep 2026 18:37 UTC
api
agents-and-tools/tool-use/build-a-tool-using-agent
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apichanged
agents-and-tools/tool-use/build-a-tool-using-agent
MESSAGES='[{"role": "user", "content": "Schedule a weekly team standup every Monday at 9am for the next 4 weeks. Invite the whole team: [email protected], [email protected], carol@
MESSAGES='[{"role": "user", "content": "Schedule a weekly team standup every Monday at 9am for the next 4 weeks, starting Monday, March 30, 2026. Invite the whole team: alice@exa
MESSAGES='[{"role": "user", "content": "Schedule a weekly team standup every Monday at 9am for the next 4 weeks. Invite the whole team: [email protected], [email protected], carol@
MESSAGES='[{"role": "user", "content": "Schedule a weekly team standup every Monday at 9am for the next 4 weeks, starting Monday, March 30, 2026. Invite the whole team: alice@exa
"content": "Schedule a weekly team standup every Monday at 9am for the next 4 weeks. Invite the whole team: [email protected], [email protected], [email protected].",
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Recorded here 23 Sep 2026 18:37 UTC
api
agents-and-tools/agent-skills/claude-api-skill
±changed
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apichanged
agents-and-tools/agent-skills/claude-api-skill
When the scope is ambiguous (for example, a bare `/claude-api migrate to claude-opus-5`), the skill asks you to choose between the entire working directory, a specific subdirectory
When the scope is ambiguous (for example, a bare `/claude-api migrate to claude-opus-5-5`), the skill asks you to choose between the entire working directory, a specific subdirecto
* **Model ID swaps**, including typed SDK constants (`Model.CLAUDE_OPUS_4_8` → `Model.CLAUDE_OPUS_5`) across all supported languages, and classifies each file as a caller, a model
* **Model ID swaps**, including typed SDK constants (`Model.CLAUDE_OPUS_4_8` → `Model.CLAUDE_OPUS_5_5`) across all supported languages, and classifies each file as a caller, a mode
For the full list of model-specific changes the skill applies, see [Migrating to Claude Opus 5.5 from Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5-5/migration-g
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Recorded here 23 Sep 2026 18:37 UTC
api
about-claude/pricing
±changed
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apichanged
about-claude/pricing
| Model | Base input tokens | 5m cache writes | 1h c
| :------------------------------------------------------------------------------------------------------------------------------------ | :---------------- | :-------------- | :---
| Claude Fable 5.1 | $10 / MTok | $12.50 / MTok | $20
| Claude Mythos 5.1 ([limited availability](https://anthropic.com/glasswing)) | $10 / MTok | $12.50 / MTok | $20
| Claude Fable 5 | $10 / MTok | $12.50 / MTok | $20
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Recorded here 23 Sep 2026 18:37 UTC
api
about-claude/models/choosing-a-model
±changed
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apichanged
about-claude/models/choosing-a-model
<Card title="What's new in Claude Opus 5" icon="sparkle" href="https://platform.claude.com/docs/en/models/opus-5/whats-new-opus-5">
Explore the improvements in Claude Opus 5
</Card>
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Recorded here 23 Sep 2026 18:37 UTC
api
about-claude/model-deprecations
±changed
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apichanged
about-claude/model-deprecations
<Note>
[Claude Mythos Preview](https://anthropic.com/glasswing) (`claude-mythos-preview`) is deprecated. To migrate to [Claude Mythos 5](https://anthropic.com/glasswing) (`claude-mythos
</Note>
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Recorded here 23 Sep 2026 18:37 UTC
api
manage-claude/cmek-google-cloud-kms
±changed
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apichanged
manage-claude/cmek-google-cloud-kms
The `--labels` option adds the organization label, `anthropic-org-<ORGANIZATION_UUID>` with the value `true`, where `<ORGANIZATION_UUID>` is your Anthropic organization ID in l
<Note>
**Finding your organization ID:** Copy the **Organization ID** field under **Settings > Organization** in the Claude Console, or under **Organization settings > Organization*
</Note>
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Recorded here 23 Sep 2026 16:37 UTC
api
manage-claude/cmek-azure-key-vault
±changed
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apichanged
manage-claude/cmek-azure-key-vault
The `--tags` option adds the organization tag, `anthropic-org-<ORGANIZATION_UUID>` with the value `true`, where `<ORGANIZATION_UUID>` is your Anthropic organization ID in lower
<Note>
**Finding your organization ID:** Copy the **Organization ID** field under **Settings > Organization** in the Claude Console, or under **Organization settings > Organization*
</Note>
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Recorded here 23 Sep 2026 16:37 UTC
api
manage-claude/cmek-aws-kms
±changed
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apichanged
manage-claude/cmek-aws-kms
<Note>
**Claude Platform on AWS:** Skip this step. Your key policy grants access to an AWS service principal, and it has no organization condition. [Set up CMEK on Claude Platform o
</Note>
To find [your AWS account ID](https://docs.aws.amazon.com/IAM/latest/UserGuide/console-account-id.html), run `aws sts get-caller-identity --query Account --output text`.
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Recorded here 23 Sep 2026 16:37 UTC
22 Sep 2026
161 pages
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api
test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
±changed
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apichanged
test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model="claude-opus-5",
model="claude-opus-5-5",
model: "claude-opus-5",
+8 −8 lines
Recorded here 22 Sep 2026 16:37 UTC
api
test-and-evaluate/develop-tests
±changed
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apichanged
test-and-evaluate/develop-tests
model="claude-opus-5",
model="claude-opus-5-5",
model: "claude-opus-5",
model: "claude-opus-5-5",
Model = Model.ClaudeOpus5,
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api
resources/overview
±changed
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apichanged
resources/overview
<Card title="Claude Opus 5.5 System Card" icon="file" href="https://www.anthropic.com/claude-opus-5-5-system-card">
Detailed documentation of Claude Opus 5.5.
</Card>
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release-notes/system-prompts/overview
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<Card id="claude-opus-5-5" title="Claude Opus 5.5" icon="file" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-5-5" />
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release-notes/overview
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### September 22, 2026
* We've launched **Claude Opus 5.5** (`claude-opus-5-5`), a model for long-running agentic coding and knowledge work. It has a [1M token context window](https://platform.claude.com
* On Claude Opus 5.5, thinking can't be disabled: `thinking: {"type": "disabled"}` and `thinking: {"type": "enabled", ...}` return a 400 error. Omit the `thinking` field and contro
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| [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview) | 1M | 128K | $5 / $25 | Moderate | Adaptive | `high` | May 2
| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Moderate | Adaptive (always on) | `medium` | Jun 2
* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4
* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 a
* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, an
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"content": "Are there an infinite number of prime numbers such that n mod 4 == 3?"
"content": "Find all pairs of positive integers (x, y) such that x^2 - y^2 = 2024."
content: Are there an infinite number of prime numbers such that n mod 4 == 3?
content: Find all pairs of positive integers (x, y) such that x^2 - y^2 = 2024.
"content": "Are there an infinite number of prime numbers such that n mod 4 == 3?",
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models/sonnet-4-6/overview
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| [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview) | 1M | 128K | $5 / $25 | Adaptive | `high` | May 20
| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 20
* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4
* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 a
* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, an
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models/sonnet-4-5/overview
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| [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview) | 1M | 128K | $5 / $25 | Adaptive | `high` | May 2026
| [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026
* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4
* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 a
* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, an
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models/overview
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If you're unsure which model to use, start with [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview) for most workloads. Use [Claude Fable 5.1](https://platf
If you're unsure which model to use, start with [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) for most workloads. Use [Claude Fable 5.1](https://p
| Feature | Claude Fable 5.1
| :-------------------------------------------------------------------------------------------------------- | :---------------------------------------------------------------------
| Description | For demanding reasoning and long-horizon agentic work
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