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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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claude-opus-4-6 Claude Developer Platform · title release-notes/system-prompts/claude-opus-4-6 model-deprecations Claude Developer Platform · in the page about-claude/model-deprecations …e | N/A | Not sooner than April 16, 2027 | | claude-opus-4-6 | Active | N/A | Not sooner than February 5, 2027 | | claude-opus-4-5-20251101… Or, for the model with the same capabilities and no access approval requirement: Claude Developer Platform · in the page about-claude/models/migration-guide …4). #### Update your model name ```python # Opus migration model = "claude-opus-4-6" # Before model = "claude-opus-5" # After ``` #### Breaking changes 1. **Extended thinking removed:** `thinkin… model-ids-and-versions Claude Developer Platform · in the page about-claude/models/model-ids-and-versions …minor segment. For example: `claude-sonnet-4-6`, `claude-sonnet-5`, `claude-opus-4-6`, `claude-opus-4-7`, `claude-opus-4-8`, and `claude-opus-5` On Amazon Bedrock, the corresponding format is: ```t… advisor-tool Claude Developer Platform · in the page agents-and-tools/tool-use/advisor-tool …(claude-opus-4-8) Claude Opus 4.7 (claude-opus-4-7) Claude Opus 4.6 (claude-opus-4-6) Claude Sonnet 5 (claude-sonnet-5) Claude Sonnet 4.6 (claude-sonnet-4-6) | | Claude Sonnet 4.6 (claude-sonnet-4-6)… code-execution-tool Claude Developer Platform · in the page agents-and-tools/tool-use/code-execution-tool …e_execution_20260120`, `code_execution_20260521` | | Claude Opus 4.6 (claude-opus-4-6) | `code_execution_20250825`, `code_execution_20260120`, `code_execution_20260521` | | Claude Sonnet… Process results programmatically Claude Developer Platform · in the page agents-and-tools/tool-use/programmatic-tool-calling …| Claude Opus 4.7 (claude-opus-4-7) | | Claude Opus 4.6 (claude-opus-4-6) | | Claude Sonnet 5 (claude-sonnet-5) | | Claude Sonnet 4.6 (claude-sonnet-4-6)… tool-search-tool Claude Developer Platform · in the page agents-and-tools/tool-use/tool-search-tool …egex_20251119`, `tool_search_tool_bm25_20251119` | | Claude Opus 4.6 (claude-opus-4-6) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` | | Claude Sonnet 4.6 (claude-… Beta Claude Developer Platform · in the page api/beta …ntelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Agents Claude Developer Platform · in the page api/beta/agents …Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best c… Archive Agent Claude Developer Platform · in the page api/beta/agents/archive …Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Create Agent Claude Developer Platform · in the page api/beta/agents/create …Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best c… List Agents Claude Developer Platform · in the page api/beta/agents/list …Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Get Agent Claude Developer Platform · in the page api/beta/agents/retrieve …Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Update Agent Claude Developer Platform · in the page api/beta/agents/update …Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best c… Versions Claude Developer Platform · in the page api/beta/agents/versions …Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… List Agent Versions Claude Developer Platform · in the page api/beta/agents/versions/list …Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Messages Claude Developer Platform · in the page api/beta/messages …ntelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Batches Claude Developer Platform · in the page api/beta/messages/batches …ligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonn… Create a Message Batch Claude Developer Platform · in the page api/beta/messages/batches/create …ligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonn… Retrieve Message Batch results Claude Developer Platform · in the page api/beta/messages/batches/results …ligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonn… Count tokens in a Message Claude Developer Platform · in the page api/beta/messages/count_tokens …ntelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Create a Message Claude Developer Platform · in the page api/beta/messages/create …ntelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Sessions Claude Developer Platform · in the page api/beta/sessions …werful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Archive Session Claude Developer Platform · in the page api/beta/sessions/archive …werful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Create Session Claude Developer Platform · in the page api/beta/sessions/create …werful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Events Claude Developer Platform · in the page api/beta/sessions/events …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… List Events Claude Developer Platform · in the page api/beta/sessions/events/list …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Stream Events Claude Developer Platform · in the page api/beta/sessions/events/stream …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… List Sessions Claude Developer Platform · in the page api/beta/sessions/list …werful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Get Session Claude Developer Platform · in the page api/beta/sessions/retrieve …werful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Threads Claude Developer Platform · in the page api/beta/sessions/threads …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Archive Session Thread Claude Developer Platform · in the page api/beta/sessions/threads/archive …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Events Claude Developer Platform · in the page api/beta/sessions/threads/events …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… List Session Thread Events Claude Developer Platform · in the page api/beta/sessions/threads/events/list …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Stream Session Thread Events Claude Developer Platform · in the page api/beta/sessions/threads/events/stream …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… List Session Threads Claude Developer Platform · in the page api/beta/sessions/threads/list …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Get Session Thread Claude Developer Platform · in the page api/beta/sessions/threads/retrieve …rful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Update Session Claude Developer Platform · in the page api/beta/sessions/update …werful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Completions Claude Developer Platform · in the page api/completions …class of intelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combina… Create a Text Completion Claude Developer Platform · in the page api/completions/create …class of intelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combina… Messages Claude Developer Platform · in the page api/messages …class of intelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combina… Batches Claude Developer Platform · in the page api/messages/batches …s of intelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Create a Message Batch Claude Developer Platform · in the page api/messages/batches/create …s of intelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Retrieve Message Batch results Claude Developer Platform · in the page api/messages/batches/results …intelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"`… Count tokens in a Message Claude Developer Platform · in the page api/messages/count_tokens …class of intelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combina… Create a Message Claude Developer Platform · in the page api/messages/create …class of intelligence, strongest in coding and cybersecurity - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combina… rate-limits Claude Developer Platform · in the page api/rate-limits …Opus 4.7 (requests return an error) or Claude Opus 4.6 (requests to `claude-opus-4-6` with `speed: "fast"` run at standard speed). See [Fast mode](https://platform.claude.com/docs/en/build-with-claud… claude-in-microsoft-foundry Claude Developer Platform · in the page build-with-claude/claude-in-microsoft-foundry …| | ✓ | | Claude Opus 4.6 | claude-opus-4-6 | | ✓ | | Claude Opus 4.5 | claude-opus-4-5 |… claude-on-amazon-bedrock-legacy Claude Developer Platform · in the page build-with-claude/claude-on-amazon-bedrock-legacy …- | ---- | ---- | ------ | | Claude Opus 4.6 | anthropic.claude-opus-4-6-v1 | Yes | Yes | Yes | Yes | Yes | | Claude Sonnet 4.6 | anthropic.claude-sonne…