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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 4 Oct 2026
One change · claude-code

Model configuration changedmodel-config

Nearest release: v2.1.289, published 8 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 4 Oct 2026 04:39 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 4 Oct 2026 05:07 UTC.

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694694| :- | :- |
695695| Toggle for the current session | Press `Option+T` on macOS or `Alt+T` on Windows and Linux |
696696| Set the global default | Run `/config` and toggle thinking mode. Saved as `alwaysThinkingEnabled` in `~/.claude/settings.json` |
697| Disable through an environment variable | Set [`MAX_THINKING_TOKENS=0`](/docs/en/env-vars), which turns thinking off on the Anthropic API except on Opus 5.5, Sonnet 5.5, and Fable models. On [third-party providers](/docs/en/third-party-integrations), Claude Code omits the `thinking` parameter instead, and adaptive-reasoning models may still think. Other values apply only with a [fixed thinking budget](#adaptive-reasoning-and-fixed-thinking-budgets) |
697| Disable through an environment variable | Set [`MAX_THINKING_TOKENS=0`](/docs/en/env-vars), which turns thinking off on the Anthropic API except on Opus 5.5, Sonnet 5.5, and Fable models. On [third-party providers](/docs/en/third-party-integrations), Claude Code omits the `thinking` parameter instead, and adaptive-reasoning models may still think |
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699699You can't turn thinking off on Opus 5.5, Sonnet 5.5, or the Fable models. The session toggle and the `/config` row show `Thinking can't be turned off` for these models instead of offering the switch, and a saved `alwaysThinkingEnabled: false` or `MAX_THINKING_TOKENS=0` has no effect there. On these models, the model decides per step how much to think based on the effort level. The saved setting applies again when you switch to a model that accepts it.
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