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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.94

Amazon Bedrock (Mantle) Provider

What

New backend provider option enabling Claude Code to connect through Amazon Bedrock's managed Mantle service.

Usage
export CLAUDE_CODE_USE_MANTLE=1
claude
Details
  • Set CLAUDE_CODE_USE_MANTLE to enable the Mantle provider
  • Additional env vars: ANTHROPIC_BEDROCK_MANTLE_BASE_URL, ANTHROPIC_BEDROCK_MANTLE_API_KEY, CLAUDE_CODE_SKIP_MANTLE_AUTH
  • Uses bedrock-mantle as the service name with SigV4 authentication
  • Supports explicit AWS credentials or the standard AWS credential provider chain
  • Base URL pattern: https://bedrock-mantle.{region}.api.aws/anthropic
  • Mantle endpoints added to all model deployment configurations
  • Provider detection centralised into a single function that handles Mantle alongside existing providers (Bedrock, Vertex, Foundry)
  • The ANTHROPIC_BEDROCK_MANTLE_API_KEY is treated as sensitive and masked in logs
Evidence

Provider configuration (search for "Amazon Bedrock (Mantle)", "CLAUDE_CODE_USE_MANTLE", "bedrock-mantle")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.94 →