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The /v1/chat/completions endpoint is the primary interface for text-based workflows. It supports streaming, tool calling, and structured outputs across all providers.

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Standard Request

curl --request POST \
  --url https://api.inworld.ai/v1/chat/completions \
  --header 'Authorization: Bearer <your-api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "auto",
    "messages": [
      {"role": "system", "content": "You are a helpful assistant."},
      {"role": "user", "content": "Write a 50-word bio for a software engineer."}
    ],
    "stream": true
  }'

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Advanced Features

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Tool Calling (Function Calling)

Inworld Router normalizes tool calling. You define tools in the OpenAI format, and the router translates them for Anthropic or Google models.

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Structured Outputs (JSON Mode)

Force the model to return valid JSON by setting response_format: { "type": "json_object" }. Inworld Router ensures the underlying provider respects this constraint.

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Streaming

Real-time token streaming is supported for all providers. The stream format is identical to OpenAI’s Server-Sent Events (SSE).