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Sweep 28 Sep 2026 · 18:16Z Build v2.1.284 505 read Stable v2.1.277 Latest v2.1.284 Next v2.1.284 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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claude-on-amazon-bedrock-legacy changedbuild-with-claude/claude-on-amazon-bedrock-legacy

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131131#### API model IDs
132132 
133133<Note>
134 Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, and Claude Opus 4.7 are reachable through `InvokeModel` on `bedrock-runtime`. These requests are served by the same infrastructure as the [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock) endpoint. For the native Messages API request shape and full feature parity, use that page. These models are omitted from the model table on this page because they do not have ARN-versioned model IDs.
134 Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, and Claude Opus 4.7 are reachable through `InvokeModel` on `bedrock-runtime`. These requests are served by the same infrastructure as the [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock) endpoint. For the native Messages API request shape and full feature parity, use that page. These models are omitted from the model table on this page because they do not have ARN-versioned model IDs.
135135</Note>
136136 
137137Lifecycle terms (Deprecated, Retired) are defined in [Model deprecations](https://platform.claude.com/docs/en/about-claude/model-deprecations). Lifecycle dates on partner-operated platforms are set by the partner and can differ from the Claude API schedule. For the current retirement date of any model on Amazon Bedrock, see [Amazon Bedrock's model lifecycle page](https://docs.aws.amazon.com/bedrock/latest/userguide/model-lifecycle.html).
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756756 
757757### Mid-conversation system messages on Bedrock
758758 
759[Mid-conversation system messages](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages) are available through the InvokeModel API for Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, and Claude Opus 4.8. As described in the note under [API model IDs](https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy#api-model-ids), these requests are served by the same infrastructure as the [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock) endpoint. No beta header is required. This feature is not available on Claude Sonnet 5. Use the top-level `system` field instead. It is not available for the ARN-versioned models in the model table on this page.
759[Mid-conversation system messages](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages) are available through the InvokeModel API for Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, and Claude Sonnet 5.5. As described in the note under [API model IDs](https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy#api-model-ids), these requests are served by the same infrastructure as the [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock) endpoint. No beta header is required. This feature is not available on Claude Sonnet 5. Use the top-level `system` field instead. It is not available for the ARN-versioned models in the model table on this page.
760760 
761761**For Converse API users:** the Converse API accepts system instructions through its top-level [`system` parameter](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_Converse.html). To add system instructions mid-conversation, use the InvokeModel API.
762762 
763763### Context window
764764 
765Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5, and Claude Sonnet 4.6 have a [1M-token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows) on Amazon Bedrock. Other Claude models, including Sonnet 4.5 and Sonnet 4 (deprecated), have a 200k-token context window.
765Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5.5, Claude Sonnet 5, and Claude Sonnet 4.6 have a [1M-token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows) on Amazon Bedrock. Other Claude models, including Sonnet 4.5 and Sonnet 4 (deprecated), have a 200k-token context window.
766766 
767767Bedrock limits request payloads to 20 MB. When sending large documents or many images, you may reach this limit before the token limit.
768768 
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