feat: Anthropic passthough: support Claude Platform and third-party Anthropic API providers - #526
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…nthropic API providers Accept any upstream endpoint ending with /v1/messages, not just the Azure AI Foundry /anthropic/v1/messages one. Foundry endpoints (azure hostname + /anthropic base path) keep using AsyncAnthropicFoundry; everything else is called through the vanilla AsyncAnthropic client, which authenticates with the x-api-key header. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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AlexFoxalt
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Aug 12, 2026
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Backward-compatible extension of the upstreams accepted by the Anthropic Messages API endpoints (both passthrough mode and chat completions adapter).
Accepted upstream endpoints
https://${resource}.services.ai.azure.com/anthropic/v1/messagesapi-key, Entra ID fallbackhttps://api.anthropic.com/v1/messagesx-api-keyhttps://api.fireworks.ai/inference/v1/messagesx-api-keyhttps://openrouter.ai/api/v1/messagesx-api-key