✓ PASS

pydantic-ai 2.61.0

stream.utf8-split · ollama-openai

Requirements

Id	Level	Status	Evidence
text-reported	MUST	SATISFIED	text.value="Café Zürich — καλημέρα! Tokyo for us! 🌸🎉" (primary); truth.text="Café Zürich — καλημέρα! Tokyo for us! 🌸🎉"
no-replacement-chars	MUST	SATISFIED	text.value="Café Zürich — καλημέρα! Tokyo for us! 🌸🎉" (primary); U+FFFD count=0

What the provider sent

Finish: stop
Raw finish: stop
Text: Café Zürich — καλημέρα! Tokyo for us! 🌸🎉
Tool calls: []
Usage: { "alternatives": {}, "cached_input": null, "input": null, "output": null, "raw": null, "reasoning": null, "total": null }
Stream completed: true
Error: null

Wire excerpt

status: 200
content-type: text/event-stream
body (chunks_b64):
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
gJQifSwiZmluaXNoX3JlYXNvbiI6bnVsbH1dfQoKZGF0YTogeyJpZCI6ImNoYXRjbXBsLTMwOCIsIm9iamVjdCI6ImNoYXQuY29tcGxldGlvbi5jaHVuayIsImNyZWF0ZWQiOjE3OTE4MzE2NzAsIm1vZGVsIjoicXdlbjMuNTowLjhiIiwic3lzdGVtX2ZpbmdlcnByaW50IjoiZnBfb2xsYW1hIiwiY2hvaWNlcyI6W3siaW5kZXgiOjAsImRlbHRhIjp7ImNvbnRlbnQiOiIgzg==
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

What the library reported

Outcome

returned

Finish

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

Text

Value: Café Zürich — καλημέρα! Tokyo for us! 🌸🎉
Surface: primary

Tool calls

[]

Usage

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

Stream

{
  "chunks_seen": 19,
  "completed": true,
  "used": true
}

Error

null

Unsupported reason

null

Full observation JSON

{
  "elapsed_ms": 197.2484551370144,
  "error": null,
  "finish": {
    "raw": "stop",
    "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": 19,
    "completed": true,
    "used": true
  },
  "structured": {
    "attempted": false,
    "returned_as_success": false,
    "value": null
  },
  "text": {
    "surface": "primary",
    "value": "Café Zürich — καλημέρα! Tokyo for us! 🌸🎉"
  },
  "tool_calls": [],
  "unsupported_reason": null,
  "usage": {
    "cached_input": 0,
    "input": 0,
    "output": 0,
    "reasoning": 0,
    "surface": {
      "cached_input": "primary",
      "input": "primary",
      "output": "primary",
      "reasoning": "primary",
      "total": "primary"
    },
    "total": 0
  }
}

Fixture

derived ollama-openai/stream.utf8-split

Provenance	Value
Transform	rechunk_inside_utf8
Source fixture	ollama-openai/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 ollama-openai/stream.utf8-split

Plain-library snippet from the shim manifest.

OllamaModel(model, provider=OllamaProvider(base_url=WIRETRUTH_BASE_URL_OLLAMA_OPENAI, api_key=WIRETRUTH_API_KEY)); /v1 base

Upstream

No matching upstream report.

History

Version	Grade
2.61.0	✓ PASS
2.56.0	✓ PASS