Model configuration changedmodel-config
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161161* **Main session model**: `/model`, the `--model` flag, the `ANTHROPIC_MODEL` environment variable, the `model` setting, and the model restored when [resuming a session](#setting-your-model)
162162* **Alias resolution**: the `ANTHROPIC_DEFAULT_OPUS_MODEL`, `ANTHROPIC_DEFAULT_SONNET_MODEL`, `ANTHROPIC_DEFAULT_HAIKU_MODEL`, and `ANTHROPIC_DEFAULT_FABLE_MODEL` environment variables cannot redirect an allowed alias to a model outside the list
163163* **Fast mode**: `/fast` refuses to toggle when it would implicitly switch to an Opus model outside the list, with the message "is not in your organization's allowed models"
164* **Subagent and teammate models**: the `model` field in [subagent](/docs/en/sub-agents#choose-a-model) frontmatter, the Agent tool's `model` parameter, [agent team](/docs/en/agent-teams#specify-teammates-and-models) teammate models including the `teammateDefaultModel` setting, `CLAUDE_CODE_SUBAGENT_MODEL`, and, on v2.1.197 and earlier, the model picker in the `/agents` wizard 
164* **Subagent and teammate models**: the `model` field in [subagent](/docs/en/sub-agents#choose-a-model) frontmatter, the Agent tool's `model` parameter, [agent team](/docs/en/agent-teams#specify-teammates-and-models) teammate models, `CLAUDE_CODE_SUBAGENT_MODEL`, and, on v2.1.197 and earlier, the model picker in the `/agents` wizard 
165165* **Skill and command models**: the `model` frontmatter in [skills and commands](/docs/en/skills)
166166* **Advisor model**: the configured [`advisorModel`](/docs/en/advisor) setting and the `--advisor` flag
167167* **Background agent model**: the model selected in the [dispatch picker](/docs/en/agent-view)
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175175* **`/model`**: Claude Code rejects the switch with an error
176176* **`--model` flag, `ANTHROPIC_MODEL`, or the `model` setting**: Claude Code replaces the value at startup with a warning naming both the requested and substituted models, and the session starts on the default model
177* **Subagent or teammate override**: Claude Code falls back to the [subagent's inherited model](/docs/en/sub-agents#choose-a-model) or the [default teammate model](/docs/en/agent-teams#specify-teammates-and-models) rather than failing the request. In interactive sessions, Claude Code warns you when it substitutes a subagent's model, by this fallback or by the newest-permitted-version substitution above, naming the requested and substituted models; it doesn't report a teammate's fallback. When the blocked value is the **Default teammate model** setting itself, Claude Code runs the teammate on your provider's default Opus model, or on the lead's model when the allowlist blocks that too. Where the newest-permitted-version substitution above operates, a blocked family alias follows it instead; before v2.1.222, an alias fell back like any other blocked value on every provider
177* **Subagent or teammate override**: Claude Code falls back to the [subagent's inherited model](/docs/en/sub-agents#choose-a-model) or the [lead's model for a teammate](/docs/en/agent-teams#specify-teammates-and-models) rather than failing the request. In interactive sessions, Claude Code warns you when it substitutes a subagent's model, by this fallback or by the newest-permitted-version substitution above, naming the requested and substituted models; it doesn't report a teammate's fallback. Where the newest-permitted-version substitution above operates, a blocked family alias follows it instead; before v2.1.222, an alias fell back like any other blocked value on every provider
178178* **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
179179* **`advisorModel` setting**: the advisor is disabled for the session
180180* **`--advisor` flag**: Claude Code exits with an error at launch
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