Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Reading a new release v2.1.280 First look · 1/6 0 findings $0.00 so far
One change · api

Create a Message Batch changed

api/messages/batches/create

Nearest release: v2.1.258, published an hour after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Recorded here
Lines+9added
Lines−21removed
From line 1,090 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits9to this page, all time

The whole hunk

from line 1090, old and new numbered
/
lines
from line 1090
10901090 
10911091 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
10921092 
1093 - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more`
1093 - `"claude-fable-5-1" or "claude-mythos-5-1" or "claude-sonnet-5" or 14 more`
10941094 
10951095 The model that will complete your prompt.
10961096 
10971097 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
10981098 
1099 - `"claude-fable-5-1"`
1100 
1101 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
1102 
1103 - `"claude-mythos-5-1"`
1104 
1105 Our most capable model for cybersecurity and biology research, available through trusted access programs
1106 
10991107 - `"claude-sonnet-5"`
11001108 
11011109 High-performance model for coding and agents
from line 1693
16851693 
16861694 - `type: "browser_toolset_20260801"`
16871695 
1688 - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"`
1689 
1690 - `"direct"`
1691 
1692 - `"code_execution_20250825"`
1693 
1694 - `"code_execution_20260120"`
1695 
1696 - `"code_execution_20260521"`
1697 
16981696 - `cache_control: optional CacheControlEphemeral or null`
16991697 
17001698 Create a cache control breakpoint at this content block.
from line 2124
21262124 via `configs.zoom.enabled`.
21272125 
21282126 - `type: "computer_toolset_20260801"`
2129 
2130 - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"`
2131 
2132 - `"direct"`
2133 
2134 - `"code_execution_20250825"`
2135 
2136 - `"code_execution_20260120"`
2137 
2138 - `"code_execution_20260521"`
21392127 
21402128 - `cache_control: optional CacheControlEphemeral or null`
21412129