9 pages for anthropic_default_model.

Claude Code on Amazon Bedrock Claude Code CLI · in the page amazon-bedrock …odel. When Claude Code starts the session on the model you set with [`ANTHROPIC_DEFAULT_MODEL`](/docs/en/model-config#set-a-default-model-for-new-sessions), background tasks use that model too. Settin… Environment variables Claude Code CLI · in the page env-vars …| | `ANTHROPIC_DEFAULT_MODEL` | Model that new sessions start on by default. Requires Claude Code v2.1.23… Claude Code on Google Cloud's Agent Platform Claude Code CLI · in the page google-vertex-ai …odel. When Claude Code starts the session on the model you set with [`ANTHROPIC_DEFAULT_MODEL`](/docs/en/model-config#set-a-default-model-for-new-sessions), background tasks use that model too. Settin… Roll out an LLM gateway for your organization Claude Code CLI · in the page llm-gateway-rollout …r-third-party-deployments) and can change when developers upgrade | [`ANTHROPIC_DEFAULT_MODEL`](/docs/en/model-config#set-a-default-model-for-new-sessions) for the model new sessions start on, and the… Model configuration Claude Code CLI · in the page model-config …ault for new sessions](#set-a-default-model-for-new-sessions)**: set `ANTHROPIC_DEFAULT_MODEL=<alias|name>` `/model` saves your choice as the default for new sessions by writing the `model` field in… Customize sessions in self-hosted environments Claude Code CLI · in the page self-hosted-environments-configuration …r the provider. You can't choose the model with `ANTHROPIC_MODEL` or `ANTHROPIC_DEFAULT_MODEL` in the runner's environment, but you can pin what an alias resolves to: * **`ANTHROPIC_MODEL` and `ANTH… All settings Claude Code CLI · in the page settings-reference …={null} { "model": "claude-sonnet-5" } ``` A value here outranks [`ANTHROPIC_DEFAULT_MODEL`](/docs/en/model-config#set-a-default-model-for-new-sessions), which Claude Code uses only when nothing el… Week 34 · August 17–21, 2026 Claude Code CLI · in the page whats-new/2026-w34 …code blocks, inline code, and lists, the same way replies doThe new [`ANTHROPIC_DEFAULT_MODEL`](/docs/en/model-config#set-a-default-model-for-new-sessions) environment variable sets the model new sess… What's new Claude Code CLI · in the page whats-new/index …your phone so you can start a session on it from the Code tab; and **`ANTHROPIC_DEFAULT_MODEL`** sets the model new sessions start on. [Read the Week 34 digest →](/docs/en/whats-new/2026-w34.md) **W…