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Sweep 10 Nov 2026 · 02:18Z Build v2.1.322 539 read Stable v2.1.311 Latest v2.1.322 Next v2.1.322 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.321 ·

Claude Code strips Amazon Bedrock prefixes from model IDs before matching them

Claude Code now removes Bedrock ARN, region and anthropic. prefixes from a model ID before checking which model it is

You'll notice Improvements
JSON All of v2.1.321
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1Signal: worth watching, 1 to 5
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ImprovementsKind: in v2.1.321,
ImprovementsSection of the release

Unclear It is not clear whether Bedrock model IDs that were not recognised before are recognised now.

What

Amazon Bedrock is Amazon's service for running Claude. It often names models with long identifiers, such as an ARN (Amazon Resource Name). Claude Code's check that works out which model a name refers to now strips these before matching:

  • Bedrock ARN prefixes for foundation-model and inference-profile
  • the anthropic. prefix
  • an optional region prefix in front of it
Why

Bedrock ARNs and inference-profile IDs may now be recognised as Claude models.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear whether Bedrock model IDs that were not recognised before are recognised now.

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