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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.319 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 3 Sep 2026
One change · claude-code

Model configuration changedmodel-config

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Recorded edits87to this page, all time

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718718 
719719Use the following environment variables to control the model names that the aliases map to. Each value must be a full model name, or the equivalent identifier for your API provider. To choose the model your sessions start on, set [`ANTHROPIC_DEFAULT_MODEL`](#set-a-default-model-for-new-sessions), which this table omits.
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721| Environment variable | Description |
722| -------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
723| `ANTHROPIC_DEFAULT_FABLE_MODEL` | The model to use for `fable`, and the model ID Claude Code recognizes as a Fable model for [automatic model fallback](#automatic-model-fallback) on third-party providers |
724| `ANTHROPIC_DEFAULT_OPUS_MODEL` | The model to use for `opus`, or for `opusplan` when Plan Mode is active. |
725| `ANTHROPIC_DEFAULT_SONNET_MODEL` | The model to use for `sonnet`, or for `opusplan` when Plan Mode is not active. |
726| `ANTHROPIC_DEFAULT_HAIKU_MODEL` | The model to use for `haiku`, or [background functionality](/docs/en/costs#background-token-usage) |
727| `CLAUDE_CODE_SUBAGENT_MODEL` | The default model for [subagents](/docs/en/sub-agents#choose-a-model), [agent team](/docs/en/agent-teams#specify-teammates-and-models) teammates, and [workflow](/docs/en/workflows) agents that aren't assigned a model another way. Accepts an alias such as `haiku` or a full model name. A per-invocation model or a definition's `model` field, including `inherit`, takes precedence. To change that, set [`CLAUDE_CODE_SUBAGENT_MODEL_FORCE`](/docs/en/sub-agents#choose-a-model) |
721| Environment variable | Description |
722| -------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
723| `ANTHROPIC_DEFAULT_FABLE_MODEL` | The model to use for `fable`, and the model ID Claude Code recognizes as a Fable model for [automatic model fallback](#automatic-model-fallback) on third-party providers |
724| `ANTHROPIC_DEFAULT_OPUS_MODEL` | The model to use for `opus`, or for `opusplan` when Plan Mode is active. |
725| `ANTHROPIC_DEFAULT_SONNET_MODEL` | The model to use for `sonnet`, or for `opusplan` when Plan Mode is not active. |
726| `ANTHROPIC_DEFAULT_HAIKU_MODEL` | The model to use for `haiku`, or [background functionality](/docs/en/costs#background-token-usage) |
727| `CLAUDE_CODE_SUBAGENT_MODEL` | The default model for [subagents](/docs/en/sub-agents#choose-a-model), [agent team](/docs/en/agent-teams#specify-teammates-and-models) teammates, and [workflow](/docs/en/workflows) agents that aren't assigned a model another way. Accepts an alias such as `haiku` or a full model name. A per-invocation model or a definition's `model` field, including `inherit`, takes precedence. To change that, set [`CLAUDE_CODE_SUBAGENT_MODEL_FORCE`](/docs/en/sub-agents#run-every-subagent-on-one-model) |
728728 
729729Note: `ANTHROPIC_SMALL_FAST_MODEL` is deprecated in favor of
730730`ANTHROPIC_DEFAULT_HAIKU_MODEL`.
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