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HomeDocsClaude Code CLI 19 Oct 2026
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Model configuration changedmodel-config

Nearest release: v2.1.304, published 2 hours after 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 19 Oct 2026 17:22 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 19 Oct 2026 17:37 UTC.

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254254* **Skill or command override**: Claude Code ignores the override, including a blocked family alias, and the skill or command runs on the session model. A skill or command that [runs in a subagent](/docs/en/skills#run-skills-in-a-subagent) follows the subagent behavior above instead
255255* **`advisorModel` setting**: the advisor is disabled for the session
256256* **`--advisor` flag**: Claude Code exits with an error at launch. In a [background session](/docs/en/agent-view), it starts the session without the advisor instead of exiting
257* **`CLAUDE_CODE_AUTO_MODE_MODEL`**: Claude Code ignores the variable and picks the model for its [auto mode classifier requests](/docs/en/permission-modes#default-classifier-model) as if you hadn't set it
257258 
258259Claude Code hides excluded models from the `/model` picker. Whether a model ID you list also gets a row of its own differs by provider:
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265266* **[Fallback model chains](#fallback-model-chains)**: entries outside the allowlist are dropped
266267* **Plan-mode upgrades**: on the Anthropic API and Claude Platform on AWS, an upgrade such as [`opusplan`](#opusplan-model-setting) to an excluded model uses the newest permitted version of the upgrade family. On providers with provider-specific model IDs, and when no version is permitted, the upgrade is skipped and planning continues on the session's model
267268* **[Automatic model fallback](#automatic-model-fallback)**: a fallback whose target is excluded does not run, so the flagged request ends with a refusal instead
268* **[Auto mode classifier](/docs/en/permission-modes#eliminate-prompts-with-auto-mode)**: the classifier's Claude Sonnet 5 default applies only when the allowlist permits Sonnet 5. When it's excluded, the classifier runs on the session's model, which the allowlist already governs, or on an Opus model when the session runs on a [Fable model](#work-with-fable). On providers other than the Anthropic API, that Opus fallback runs on the model you set in `ANTHROPIC_DEFAULT_OPUS_MODEL` or otherwise on Opus 5, without consulting the allowlist. Requires Claude Code v2.1.210 or later
269* **[Auto mode classifier](/docs/en/permission-modes#eliminate-prompts-with-auto-mode)**: when the allowlist excludes the [default classifier model](/docs/en/permission-modes#default-classifier-model), classifier requests that would use that model run on the session model, or an Opus model in [Fable](#work-with-fable) sessions. On providers other than the Anthropic API, that Opus fallback runs on the model you set in `ANTHROPIC_DEFAULT_OPUS_MODEL` or otherwise on Opus 5, without consulting the allowlist. Requires Claude Code v2.1.210 or later
269270* **[Fast mode](/docs/en/fast-mode)**: enabling fast mode is refused when the model the session would run on afterward is outside the allowlist
270271* **Availability fallback on Amazon Bedrock and Google Cloud's Agent Platform**: when your account loses access to a model mid-session, the switch to another model skips excluded models. The startup model checks on [Amazon Bedrock](/docs/en/amazon-bedrock#when-your-organization-enforces-a-model-allowlist) and [Google Cloud's Agent Platform](/docs/en/google-vertex-ai#when-your-organization-enforces-a-model-allowlist) skip excluded models only when managed settings also set [`enforceAvailableModels`](#enforce-the-allowlist-for-the-default-model)
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