Model configuration changedmodel-config
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402402### Fallback model chains
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404When the primary model is overloaded, unavailable, or returns another non-retryable server error, Claude Code can switch to a fallback model instead of failing the request. Authentication, billing, rate-limit, request-size, and transport errors never trigger a switch; those follow their normal retry and error handling.
404When the primary model is overloaded, unavailable, or returns another non-retryable server error, Claude Code can switch to a fallback model instead of failing the request. Authentication, billing, rate-limit, request-size, and transport errors, and a [denial by your organization's policy check](/docs/en/errors#automatic-retries), never trigger a switch; those follow their normal retry and error handling.
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406406Configure one or more fallback models and Claude Code tries them in order, showing a notice when it switches. The switch lasts for the current turn only, so your next message tries the primary model first again. Claude Code caps chains at three models after duplicate removal and ignores extra entries.
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