✓ PASS

pydantic-ai 2.61.0

stream.utf8-split · openai-responses

Requirements

Id	Level	Status	Evidence
text-reported	MUST	SATISFIED	text.value="Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉" (primary); truth.text="Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉"
no-replacement-chars	MUST	SATISFIED	text.value="Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉" (primary); U+FFFD count=0

What the provider sent

Finish: stop
Raw finish: completed
Text: Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉
Tool calls: []
Usage: { "alternatives": {}, "cached_input": 0, "input": 28, "output": 23, "raw": { "input_tokens": 28, "input_tokens_details": { "cache_write_tokens": 0, "cached_tokens": 0 }, "output_tokens": 23, "output_tokens_details": { "reasoning_tokens": 0 }, "total_tokens": 51 }, "reasoning": 0, "total": 51 }
Stream completed: true
Error: null

Wire excerpt

status: 200
content-type: text/event-stream; charset=utf-8
body (chunks_b64):
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What the library reported

Outcome

returned

Finish

{
  "raw": "completed",
  "source": "ModelResponse.finish_reason",
  "surface": "primary",
  "value": "stop"
}

Text

Value: Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉
Surface: primary

Tool calls

[]

Usage

{
  "cached_input": 0,
  "input": 28,
  "output": 23,
  "reasoning": 0,
  "surface": {
    "cached_input": "primary",
    "input": "primary",
    "output": "primary",
    "reasoning": "primary",
    "total": "primary"
  },
  "total": 51
}

Stream

{
  "chunks_seen": 20,
  "completed": true,
  "used": true
}

Error

null

Unsupported reason

null

Full observation JSON

{
  "elapsed_ms": 369.16880682110786,
  "error": null,
  "finish": {
    "raw": "completed",
    "source": "ModelResponse.finish_reason",
    "surface": "primary",
    "value": "stop"
  },
  "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": 20,
    "completed": true,
    "used": true
  },
  "structured": {
    "attempted": false,
    "returned_as_success": false,
    "value": null
  },
  "text": {
    "surface": "primary",
    "value": "Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉"
  },
  "tool_calls": [],
  "unsupported_reason": null,
  "usage": {
    "cached_input": 0,
    "input": 28,
    "output": 23,
    "reasoning": 0,
    "surface": {
      "cached_input": "primary",
      "input": "primary",
      "output": "primary",
      "reasoning": "primary",
      "total": "primary"
    },
    "total": 51
  }
}

Fixture

derived openai-responses/stream.utf8-split

Provenance	Value
Transform	rechunk_inside_utf8
Source fixture	openai-responses/stream.utf8
Rationale	A network chunk boundary splits a multi-byte UTF-8 character.
Evidence	https://github.com/langchain-ai/langchainjs/issues/5285

Reproduce

wiretruth serve openai-responses/stream.utf8-split

Plain-library snippet from the shim manifest.

OpenAIResponsesModel(model, provider=OpenAIProvider(base_url=WIRETRUTH_BASE_URL_OPENAI_RESPONSES, api_key=WIRETRUTH_API_KEY))

Upstream

No matching upstream report.

History

Version	Grade
2.61.0	✓ PASS
2.56.0	✓ PASS