Source Intelligence
Follow Discord

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.

← All of v2.1.90 Home All releases ←olderv2.1.89 v2.1.91newer→
Claude Code v2.1.90

Claude Platform on AWS Provider

What

Claude Code now supports "Claude Platform on AWS" as a first-class API provider, alongside Bedrock, Vertex, and Foundry.

Usage
CLAUDE_CODE_USE_ANTHROPIC_AWS=1 claude
Details
  • Set CLAUDE_CODE_USE_ANTHROPIC_AWS=1 to enable the provider
  • Requires ANTHROPIC_AWS_WORKSPACE_ID (or workspaceId in constructor)
  • Optionally set ANTHROPIC_AWS_BASE_URL or let it derive from AWS_REGION / AWS_DEFAULT_REGION (pattern: https://aws-external-anthropic.{region}.api.aws)
  • Supports AWS SigV4 request signing via @aws-sdk/credential-providers
  • Supports explicit credentials via awsAccessKey + awsSecretAccessKey, AWS profile, or a custom providerChainResolver
  • Set CLAUDE_CODE_SKIP_ANTHROPIC_AWS_AUTH=1 to skip authentication (for development/testing)
  • Fast mode is not available on this provider (same as Bedrock, Vertex, and Foundry)
Evidence

AnthropicAws client class (search for "Claude Platform on AWS" and "ANTHROPIC_AWS_WORKSPACE_ID")

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 v2.1.90 →