Model configuration changedmodel-config
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253253* **`advisorModel` setting**: the advisor is disabled for the session
254254* **`--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
255255
256Claude Code hides excluded models from the `/model` picker. A full model ID in the list that has no built-in picker row, such as an older version that the list pins, appears in the `/model` picker as its own labeled row, unless Claude Code replaces the built-in options with a [`modelPicker`](/docs/en/settings-reference#modelpicker) lineup. Before v2.1.199, such an ID was selectable only by typing `/model <id>`.
256Claude Code hides excluded models from the `/model` picker. Whether a model ID you list also gets a row of its own differs by provider:
257257
258* **Anthropic API, [Claude Platform on AWS](/docs/en/claude-platform-on-aws), [Claude apps gateway](/docs/en/claude-apps-gateway), or an [LLM gateway](/docs/en/llm-gateway) set through `ANTHROPIC_BASE_URL`**: an Anthropic model ID you list that has no built-in picker row appears as its own labeled row. Claude Code adds such a row for Opus, Sonnet, and Haiku versions, such as an older version that the list pins. If you set `replaceBuiltInOptions` in a [`modelPicker`](/docs/en/settings-reference#modelpicker) lineup, that row doesn't appear. Before v2.1.199, such an ID was selectable only by typing `/model <id>`.
259* **Amazon Bedrock, Google Cloud's Agent Platform, or Microsoft Foundry**: unless a model ID you list starts with `anthropic.`, Claude Code doesn't add a row for it, whether it's an Anthropic model ID or a provider-specific one. [Mantle model IDs](#mantle-model-ids) carry that prefix. To show a listed version that has no built-in row, also add it to a [`modelPicker`](/docs/en/settings-reference#modelpicker) lineup, which accepts IDs in your provider's format.
260
258261Model changes that Claude Code makes on your behalf are checked the same way:
259262
260263* **[Fallback model chains](#fallback-model-chains)**: entries outside the allowlist are dropped
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344347
345348### Mantle model IDs
346349
347When the [Amazon Bedrock Mantle endpoint](/docs/en/amazon-bedrock#use-the-mantle-endpoint) is enabled, entries in `availableModels` that start with `anthropic.` are added to the `/model` picker as custom options and routed to the Mantle endpoint. This is an exception to the alias matching described in [Pin models for third-party deployments](#pin-models-for-third-party-deployments). The setting still restricts the picker to listed entries, and a Mantle ID embeds a family name, so it counts as a specific entry and disables that family's wildcard: alongside any Mantle IDs, list the version prefixes or full IDs you want to keep selectable. See [Merge behavior](#merge-behavior).
350Entries in `availableModels` that start with `anthropic.` are added to the `/model` picker as custom options. This is an exception to the alias matching described in [Pin models for third-party deployments](#pin-models-for-third-party-deployments). With the [Amazon Bedrock Mantle endpoint](/docs/en/amazon-bedrock#use-the-mantle-endpoint) enabled, Claude Code routes the entries that match the Mantle format to that endpoint. The setting still restricts the picker to listed entries, and a Mantle ID embeds a family name, so it counts as a specific entry and disables that family's wildcard: alongside any Mantle IDs, list the version prefixes or full IDs you want to keep selectable. See [Merge behavior](#merge-behavior).
348351
349352### Block specific models or versions
350353
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