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fix(anthropic): support Azure-hosted Anthropic endpoints #9012

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fix(anthropic): support Azure-hosted Anthropic endpoints #9012

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@Cozmopolit Cozmopolit commented Dec 4, 2025 •
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Description

Adds support for Azure-hosted Anthropic models (Azure AI Foundry).
Azure requires api-key header instead of x-api-key.

Fixes #9009

Checklist

  • I've read the contributing guide
  • The relevant docs, if any, have been updated or created
  • The relevant tests, if any, have been updated or created

Tests

Added unit tests in AnthropicUtils.test.ts for:

  • Azure endpoint detection (URL parsing)
  • Correct header selection (api-key vs x-api-key)
  • Key/endpoint mismatch warning

Summary by cubic

Support Azure-hosted Anthropic endpoints by detecting Azure API base URLs and using the required api-key header. Maintains prompt caching behavior and adds a warning for key/endpoint mismatches.

  • Bug Fixes
    • Detect Azure endpoints (*.services.ai.azure.com, *.cognitiveservices.azure.com) and switch from x-api-key to api-key.
    • Update getAnthropicHeaders to accept apiBase; pass through in core Anthropic and adapter code.
    • Add unit tests for endpoint detection, header selection, caching header, and mismatch warning.

Written for commit 9e8bfcd. Summary will update automatically on new commits.

@Cozmopolit Cozmopolit requested a review from a team as a code owner December 4, 2025 21:37
@Cozmopolit Cozmopolit requested review from Patrick-Erichsen and removed request for a team December 4, 2025 21:37
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Keep this PR in a mergeable state →

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continue-development-app bot commented Dec 4, 2025

Keep this PR in a mergeable state →

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✅ Addresses code review comments

✅ Fixes failing CI checks

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@dosubot dosubot bot added the size:L This PR changes 100-499 lines, ignoring generated files. label Dec 4, 2025
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github-actions bot commented Dec 4, 2025 •
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All contributors have signed the CLA ✍️ ✅
Posted by the CLA Assistant Lite bot.

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continue bot commented Dec 4, 2025

Documentation Updates

Added a new section to the Anthropic provider documentation explaining Azure AI Foundry configuration:

  • New "Azure AI Foundry" section in docs/customize/model-providers/top-level/anthropic.mdx
  • Documents how to configure apiBase parameter for Azure-hosted Anthropic endpoints
  • Includes both YAML and JSON (deprecated) configuration examples
  • Notes automatic detection and correct authentication header usage (api-key vs x-api-key)

The documentation maintains the same level of detail as the existing sections and follows the established format.

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Cozmopolit commented Dec 4, 2025

I have read the CLA Document and I hereby sign the CLA

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No issues found across 4 files

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Cozmopolit commented Dec 4, 2025

I truly hope I did not step on anyone's toes by submitting both bug issue and PR around the same time - that was not my intent.

Keep up the great work, ty

Cozmo

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@Patrick-Erichsen Patrick-Erichsen Awaiting requested review from Patrick-Erichsen Patrick-Erichsen is a code owner automatically assigned from continuedev/continue-code-reviewers

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Bug: Anthropic provider fails with Azure AI Foundry endpoints (incorrect auth header)

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