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Streaming returns incremental output as SSE frames so users see responses earlier.

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Supported endpoints

  • /v1/responses
  • /v1/chat/completions
  • /v1/messages

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Request

curl https://api.phaseo.app/v1/responses \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5-nano",
    "input": "Stream a short hello message.",
    "stream": true
  }'

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Response

data: {"id":"resp_...","object":"response","status":"in_progress",...}
data: {"type":"response.output_text.delta","delta":"Hello"}
data: {"type":"response.completed",...}
data: [DONE]

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SDK options

  • TypeScript SDK: client.streamResponse() and client.streamText()
  • Python SDK: client.stream_response() and client.stream_text()
  • Vercel AI SDK: streamText(...) with @ai-stats/ai-sdk-provider

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Important limitation

At current gateway request-validation level, combining tools with stream: true is rejected (400 invalid_request). Use non-streaming for tool-calling loops.

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Next guides

  1. SSE Event Reference
  2. Streaming in Production
Last modified on February 18, 2026