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Sweep 10 Nov 2026 · 02:18Z Build v2.1.322 539 read Stable v2.1.311 Latest v2.1.322 Next v2.1.322 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.260 ·

Adaptive thinking has an opt-out for specific models, unresolved by default

Adaptive thinking is now default; an env var can revert to the old mode for certain models.

Use it now Notable Improvements
JSON All of v2.1.260
Use it nowTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Thinking ModeArea: what it touches
ImprovementsKind: in v2.1.260,
What probably matters to youSection of the release

Adaptive thinking mode is now the shipped default for per-turn thinking behavior. Setting CLAUDE_CODE_DISABLE_ADAPTIVE_THINKING forces the older enabled mode instead, but only when the canonical model name includes opus-4-6 or sonnet-4-6; otherwise adaptive mode applies as normal.

Read from
Names in the bundleCLAUDE_CODE_DISABLE_ADAPTIVE_THINKING
What the documentation says
Documented inclaude-code/desktop
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up CLAUDE_CODE_DISABLE_ADAPTIVE_THINKING, on Connect Claude Code to an LLM gateway. | `400` errors naming `thinking` or `adaptive`, such as `Input tag 'adaptive' found` | The upstream model build doesn't accept adaptive reasoning, which Claude Code requests for Claude 4.6 and later models | Upgrade the gateway's upstream.… llm-gateway-connect see the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up CLAUDE_CODE_DISABLE_ADAPTIVE_THINKING, on Connect Claude Code to an LLM gateway.

See this entry in the whole of v2.1.260 →

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