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POST /v1/messages

Direct Anthropic-compatible endpoint. Use this when integrating tools that speak the Anthropic Messages format (Claude Code, some SDKs, etc.).

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Example

{
  "model": "claude-sonnet-4-20250514",
  "max_tokens": 1024,
  "messages": [
    {"role": "user", "content": "Hello from Anthropic format"}
  ]
}

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Headers

anthropic-version: 2023-06-01   (recommended)
Authorization: Bearer sk-token-...

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Behavior

Openference will forward or convert as needed based on how the model route is configured. Many models are configured to accept both formats on the same key.

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Streaming

Use the Anthropic streaming format (event: message_start, etc.).

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See also