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pydantic-ai 2.61.0

truncation.text-stream-usage · openai-chat

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Requirements

IdLevelStatusEvidence
cause-is-truncationMUSTSATISFIEDfinish.value="length" (primary: ModelResponse.finish_reason); truth.finish="length"; error.category=null; structured.returned_as_success=false
text-reportedSHOULDSATISFIEDtext.value="A traditional Japanese breakfast is built around rice, soup, and a" (primary); truth.text="A traditional Japanese breakfast is built around rice, soup, and a"
usage-reportedSHOULDSATISFIEDusage.input=42 (primary); truth.usage.input=42; usage.output=16 (primary); truth.usage.output=16

What the provider sent

Finish
length
Raw finish
length
Text
A traditional Japanese breakfast is built around rice, soup, and a
Tool calls
[]
Usage
{
  "alternatives": {},
  "cached_input": 0,
  "input": 42,
  "output": 16,
  "raw": {
    "completion_tokens": 16,
    "completion_tokens_details": {
      "accepted_prediction_tokens": 0,
      "audio_tokens": 0,
      "reasoning_tokens": 0,
      "rejected_prediction_tokens": 0
    },
    "prompt_tokens": 42,
    "prompt_tokens_details": {
      "audio_tokens": 0,
      "cache_write_tokens": 0,
      "cached_tokens": 0
    },
    "total_tokens": 58
  },
  "reasoning": 0,
  "total": 58
}
Stream completed
true
Error
null
Wire excerpt
status: 200
content-type: text/event-stream; charset=utf-8
body (sse):
data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"role":"assistant","content":"","refusal":null},"finish_reason":null}],"usage":null,"obfuscation":""}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":"A"},"finish_reason":null}],"usage":null,"obfuscation":"b"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" traditional"},"finish_reason":null}],"usage":null,"obfuscation":"d52OTd"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" Japanese"},"finish_reason":null}],"usage":null,"obfuscation":"w1dZTLipP"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" breakfast"},"finish_reason":null}],"usage":null,"obfuscation":"MWjy8UlZ"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" is"},"finish_reason":null}],"usage":null,"obfuscation":"icVTZPFYRG5lFwL"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" built"},"finish_reason":null}],"usage":null,"obfuscation":"AYTZtVaq9EDe"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" around"},"finish_reason":null}],"usage":null,"obfuscation":"kMyBiZ4fH9u"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" rice"},"finish_reason":null}],"usage":null,"obfuscation":"ipQ7qmg7ME8qn"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":","},"finish_reason":null}],"usage":null,"obfuscation":"F"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" soup"},"finish_reason":null}],"usage":null,"obfuscation":"koHOHl6FSzjzv"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":","},"finish_reason":null}],"usage":null,"obfuscation":"c"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" and"},"finish_reason":null}],"usage":null,"obfuscation":"zgb5ipuHgdlxrv"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{"content":" a"},"finish_reason":null}],"usage":null,"obfuscation":""}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[{"index":0,"delta":{},"finish_reason":"length"}],"usage":null,"obfuscation":"xJlB3tfZjb"}


data: {"id":"chatcmpl-EXmWZAYmW8gL0ntPfYzZYrbv99Dcb","object":"chat.completion.chunk","created":1791720059,"model":"gpt-6-luna","service_tier":"default","system_fingerprint":null,"choices":[],"usage":{"prompt_tokens":42,"completion_tokens":16,"total_tokens":58,"prompt_tokens_details":{"cached_tokens":0,"cache_write_tokens":0,"audio_tokens":0},"completion_tokens_details":{"reasoning_tokens":0,"audio_tokens":0,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"obfuscation":"pGcjuQsxqk"}


data: [DONE]

What the library reported

Outcome
returned
Finish
{
  "raw": "length",
  "source": "ModelResponse.finish_reason",
  "surface": "primary",
  "value": "length"
}
Text
Value
A traditional Japanese breakfast is built around rice, soup, and a
Surface
primary
Tool calls
[]
Usage
{
  "cached_input": 0,
  "input": 42,
  "output": 16,
  "reasoning": 0,
  "surface": {
    "cached_input": "primary",
    "input": "primary",
    "output": "primary",
    "reasoning": "primary",
    "total": "primary"
  },
  "total": 58
}
Stream
{
  "chunks_seen": 16,
  "completed": true,
  "used": true
}
Error
null
Unsupported reason
null
Full observation JSON
{
  "elapsed_ms": 317.9275244474411,
  "error": null,
  "finish": {
    "raw": "length",
    "source": "ModelResponse.finish_reason",
    "surface": "primary",
    "value": "length"
  },
  "format": "wiretruth.observation/v1",
  "library": {
    "api": "Agent.run_stream_events",
    "language": "python",
    "name": "pydantic-ai",
    "version": "2.61.0"
  },
  "notes": [],
  "outcome": "returned",
  "stream": {
    "chunks_seen": 16,
    "completed": true,
    "used": true
  },
  "structured": {
    "attempted": false,
    "returned_as_success": false,
    "value": null
  },
  "text": {
    "surface": "primary",
    "value": "A traditional Japanese breakfast is built around rice, soup, and a"
  },
  "tool_calls": [],
  "unsupported_reason": null,
  "usage": {
    "cached_input": 0,
    "input": 42,
    "output": 16,
    "reasoning": 0,
    "surface": {
      "cached_input": "primary",
      "input": "primary",
      "output": "primary",
      "reasoning": "primary",
      "total": "primary"
    },
    "total": 58
  }
}

Fixture

recorded openai-chat/truncation.text-stream-usage

ProvenanceValue
Recorded at2026-10-11T12:00:59Z
Requested modelgpt-6-luna
Returned modelgpt-6-luna
CI runhttps://github.com/kartsan03/wiretruth/actions/runs/38137650119

Reproduce

wiretruth serve openai-chat/truncation.text-stream-usage

Plain-library snippet from the shim manifest.

OpenAIChatModel(model, provider=OpenAIProvider(base_url=WIRETRUTH_BASE_URL_OPENAI_CHAT, api_key=WIRETRUTH_API_KEY))

Upstream

No matching upstream report.

History

VersionGrade
2.61.0✓ PASS
2.56.0✓ PASS