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4 ファイル変更 +12 -5

この更新の概要

Amazon Bedrock、Google Vertex AI、Microsoft Azure AI Foundryにおけるバックグラウンドタスク用のモデル設定が変更されました。セッションタイトルの生成などに使用される小型・高速モデルのデフォルトが、従来のHaikuからプライマリモデル（Sonnet等）へと統合されています。Haikuモデルを明示的に使用するための環境変数設定や、リージョン指定時の注意点についても詳しく追記されています。

amazon-bedrock +6 -3

バックグラウンドタスク用のモデルがデフォルトでプライマリモデルに変更され、Haikuを使用する際の環境変数の優先順位が記述されました。

@@ -196,8 +196,9 @@ Set the following environment variables to enable Bedrock:
export CLAUDE_CODE_USE_BEDROCK=1
export AWS_REGION=us-east-1 # or your preferred region
# Optional: Override the region for the small/fast model (Haiku).
# Also applies to Bedrock Mantle.
# Optional: Override the AWS region for the small/fast model (Bedrock and Mantle).
# On Bedrock, has no effect without ANTHROPIC_DEFAULT_HAIKU_MODEL
# or the deprecated ANTHROPIC_SMALL_FAST_MODEL set.
export ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION=us-west-2
# Optional: Override the Bedrock endpoint URL for custom endpoints or gateways
@@ -233,7 +234,9 @@ Claude Code uses these default models when no pinning variables are set:
| Model type | Default value |
| :--------------- | :--------------------------------------------- |
| Primary model | `us.anthropic.claude-sonnet-4-5-20250929-v1:0` |
| Small/fast model | `us.anthropic.claude-haiku-4-5-20251001-v1:0` |
| Small/fast model | Same as primary model |
Background tasks such as session title generation use the small/fast model, normally a Haiku-class model. On Bedrock, Claude Code defaults this to the primary model because Haiku may not be enabled in every account or region. To use Haiku for background tasks, set `ANTHROPIC_DEFAULT_HAIKU_MODEL` to a model ID that is available in your account.
To customize models further, use one of these methods:
env-vars +1 -1

ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION環境変数が有効になる条件として、モデルIDの指定が必須である旨が追記されました。

@@ -43,7 +43,7 @@ Claude Code supports the following environment variables to control its behavior
| `ANTHROPIC_FOUNDRY_RESOURCE` | Foundry resource name (for example, `my-resource`). Required if `ANTHROPIC_FOUNDRY_BASE_URL` is not set (see [Microsoft Foundry](/en/microsoft-foundry)) |
| `ANTHROPIC_MODEL` | Name of the model setting to use (see [Model Configuration](/en/model-config#environment-variables)) |
| `ANTHROPIC_SMALL_FAST_MODEL` | \[DEPRECATED] Name of [Haiku-class model for background tasks](/en/costs) |
| `ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION` | Override AWS region for the Haiku-class model when using Bedrock or Bedrock Mantle |
| `ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION` | Override AWS region for the Haiku-class model when using Bedrock or Bedrock Mantle. On Bedrock, this only takes effect when `ANTHROPIC_DEFAULT_HAIKU_MODEL` or the deprecated `ANTHROPIC_SMALL_FAST_MODEL` is also set, since Bedrock otherwise uses the primary model for background tasks |
| `ANTHROPIC_VERTEX_BASE_URL` | Override the Vertex AI endpoint URL. Use for custom Vertex endpoints or when routing through an [LLM gateway](/en/llm-gateway). See [Google Vertex AI](/en/google-vertex-ai) |
| `ANTHROPIC_VERTEX_PROJECT_ID` | GCP project ID for Vertex AI requests. Overridden by `GCLOUD_PROJECT`, `GOOGLE_CLOUD_PROJECT`, or the project in your `GOOGLE_APPLICATION_CREDENTIALS` credential file. See [Google Vertex AI](/en/google-vertex-ai) |
| `ANTHROPIC_WORKSPACE_ID` | Workspace ID for [workload identity federation](https://platform.claude.com/docs/en/manage-claude/workload-identity-federation). Set this when your federation rule is scoped to more than one workspace so the token exchange knows which workspace to target |
google-vertex-ai +3 -1

Vertex AI環境での小型モデルのデフォルト設定がプライマリモデルに変更され、個別に設定する場合の手順が説明されています。

@@ -212,7 +212,9 @@ Claude Code uses these default models when no pinning variables are set:
| Model type | Default value |
| :--------------- | :--------------------------- |
| Primary model | `claude-sonnet-4-5@20250929` |
| Small/fast model | `claude-haiku-4-5@20251001` |
| Small/fast model | Same as primary model |
Background tasks such as session title generation use the small/fast model, normally a Haiku-class model. On Vertex AI, Claude Code defaults this to the primary model because Haiku may not be enabled in every project or region. To use Haiku for background tasks, set `ANTHROPIC_DEFAULT_HAIKU_MODEL` to a model ID that is available in your project.
To customize models further:
microsoft-foundry +2 -0

Foundry環境におけるバックグラウンドタスク用のデフォルト動作が修正され、Haikuデプロイメントを利用するための設定方法が追加されました。

@@ -148,6 +148,8 @@ export ANTHROPIC_DEFAULT_SONNET_MODEL='claude-sonnet-4-6'
export ANTHROPIC_DEFAULT_HAIKU_MODEL='claude-haiku-4-5'
```
Background tasks such as session title generation use the small/fast model, normally a Haiku-class model. On Foundry, Claude Code defaults this to the primary model because not every account has a Haiku deployment. To use Haiku for background tasks, set `ANTHROPIC_DEFAULT_HAIKU_MODEL` to a Haiku deployment that is available in your account, as shown above.
For current and legacy model IDs, see [Models overview](https://platform.claude.com/docs/en/about-claude/models/overview). See [Model configuration](/en/model-config#pin-models-for-third-party-deployments) for the full list of environment variables.
[Prompt caching](https://platform.claude.com/docs/en/build-with-claude/prompt-caching) is enabled automatically. To request a 1-hour cache TTL instead of the 5-minute default, set the following variable; cache writes with a 1-hour TTL are billed at a higher rate: