✗ WRONG

pydantic-ai 2.61.0

stream.missing-finish · openai-responses

Requirements

Id	Level	Status	Evidence
no-normal-stop	MUST	SATISFIED	outcome=returned; finish.value=null (absent); truth.finish="none"; forbidden finish="stop"
stream-incomplete	MUST	CONTRADICTED	stream.completed=true; outcome=returned; truth.stream_completed=false

What the provider sent

Finish: none
Raw finish: null
Text: Octopuses change colour to hide from predators using specialised skin cells
Tool calls: []
Usage: { "alternatives": {}, "cached_input": null, "input": null, "output": null, "raw": null, "reasoning": null, "total": null }
Stream completed: false
Error: null

Wire excerpt

status: 200
content-type: text/event-stream; charset=utf-8
body (sse):
event: response.created
data: {"type":"response.created","response":{"id":"resp_025c23fff6653590006acbfc0086cc87d18124e70e8d3ff838","object":"response","created_at":1791753216,"status":"in_progress","access_programs":null,"background":false,"completed_at":null,"error":null,"frequency_penalty":0.0,"incomplete_details":null,"instructions":null,"max_output_tokens":16,"max_tool_calls":null,"model":"gpt-6-luna","moderation":null,"output":[],"parallel_tool_calls":true,"presence_penalty":0.0,"previous_response_id":null,"prompt_cache_key":null,"prompt_cache_retention":"24h","reasoning":{"context":"all_turns","effort":"none","mode":"standard","summary":null},"safety_identifier":null,"service_tier":"auto","store":true,"temperature":1.0,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tool_usage":{"image_gen":{"input_tokens":0,"input_tokens_details":{"image_tokens":0,"text_tokens":0},"output_tokens":0,"output_tokens_details":{"image_tokens":0,"text_tokens":0},"total_tokens":0},"web_search":{"num_requests":0}},"tools":[],"top_logprobs":0,"top_p":0.98,"truncation":"disabled","usage":null,"user":null,"metadata":{}},"sequence_number":0}


event: response.in_progress
data: {"type":"response.in_progress","response":{"id":"resp_025c23fff6653590006acbfc0086cc87d18124e70e8d3ff838","object":"response","created_at":1791753216,"status":"in_progress","access_programs":null,"background":false,"completed_at":null,"error":null,"frequency_penalty":0.0,"incomplete_details":null,"instructions":null,"max_output_tokens":16,"max_tool_calls":null,"model":"gpt-6-luna","moderation":null,"output":[],"parallel_tool_calls":true,"presence_penalty":0.0,"previous_response_id":null,"prompt_cache_key":null,"prompt_cache_retention":"24h","reasoning":{"context":"all_turns","effort":"none","mode":"standard","summary":null},"safety_identifier":null,"service_tier":"auto","store":true,"temperature":1.0,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tool_usage":{"image_gen":{"input_tokens":0,"input_tokens_details":{"image_tokens":0,"text_tokens":0},"output_tokens":0,"output_tokens_details":{"image_tokens":0,"text_tokens":0},"total_tokens":0},"web_search":{"num_requests":0}},"tools":[],"top_logprobs":0,"top_p":0.98,"truncation":"disabled","usage":null,"user":null,"metadata":{}},"sequence_number":1}


event: response.output_item.added
data: {"type":"response.output_item.added","item":{"id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","type":"message","status":"in_progress","content":[],"phase":"final_answer","role":"assistant"},"output_index":0,"sequence_number":2}


event: response.content_part.added
data: {"type":"response.content_part.added","content_index":0,"item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","output_index":0,"part":{"type":"output_text","annotations":[],"logprobs":[],"text":""},"sequence_number":3}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":"Oct","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"JJEbJBKhHOigL","output_index":0,"sequence_number":4}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":"op","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"rCPO5tGFW8ghsz","output_index":0,"sequence_number":5}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":"uses","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"byausMiYWM8M","output_index":0,"sequence_number":6}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" change","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"lE22JEr0R","output_index":0,"sequence_number":7}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" colour","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"82gNqgbaN","output_index":0,"sequence_number":8}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" to","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"h8MCvrajNun4W","output_index":0,"sequence_number":9}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" hide","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"abxffHHSLGD","output_index":0,"sequence_number":10}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" from","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"xE6TGqqC4ob","output_index":0,"sequence_number":11}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" predators","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"DzBp28","output_index":0,"sequence_number":12}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" using","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"VKy59kwIDy","output_index":0,"sequence_number":13}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" specialised","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"8sgf","output_index":0,"sequence_number":14}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" skin","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"5oQRUnZyiDK","output_index":0,"sequence_number":15}


event: response.output_text.delta
data: {"type":"response.output_text.delta","content_index":0,"delta":" cells","item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"obfuscation":"Q7EI4ex8iw","output_index":0,"sequence_number":16}


event: response.output_text.done
data: {"type":"response.output_text.done","content_index":0,"item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","logprobs":[],"output_index":0,"sequence_number":17,"text":"Octopuses change colour to hide from predators using specialised skin cells"}


event: response.content_part.done
data: {"type":"response.content_part.done","content_index":0,"item_id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","output_index":0,"part":{"type":"output_text","annotations":[],"logprobs":[],"text":"Octopuses change colour to hide from predators using specialised skin cells"},"sequence_number":18}


event: response.output_item.done
data: {"type":"response.output_item.done","item":{"id":"msg_025c23fff6653590006acbfc016d8087d18e46405588162435","type":"message","status":"incomplete","content":[{"type":"output_text","annotations":[],"logprobs":[],"text":"Octopuses change colour to hide from predators using specialised skin cells"}],"phase":"final_answer","role":"assistant"},"output_index":0,"sequence_number":19}

What the library reported

Outcome

returned

Finish

{
  "raw": null,
  "source": null,
  "surface": "absent",
  "value": null
}

Text

Value: Octopuses change colour to hide from predators using specialised skin cells
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": 16,
  "completed": true,
  "used": true
}

Error

null

Unsupported reason

null

Full observation JSON

{
  "elapsed_ms": 396.45230770111084,
  "error": null,
  "finish": {
    "raw": null,
    "source": null,
    "surface": "absent",
    "value": null
  },
  "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": "Octopuses change colour to hide from predators using specialised skin cells"
  },
  "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 openai-responses/stream.missing-finish

Provenance	Value
Transform	strip_finish
Source fixture	openai-responses/truncation.text-stream
Rationale	The stream ends cleanly without its finish signal.
Evidence	https://github.com/pydantic/pydantic-ai/issues/6610

Reproduce

wiretruth serve openai-responses/stream.missing-finish

Plain-library snippet from the shim manifest.

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

Upstream

confirmed Issue

Fixed in: not specified

A stream that ends cleanly before the provider's terminal event finishes with ModelResponse.state 'complete' and finish_reason None, although the docs define 'incomplete' as a streamed response stopped before completion. Responses marks the response incomplete, but _ContinuationStreamedResponse.get() replaces it with complete once iteration ends; the Anthropic and Google adapters never set incomplete. The Chat Completions case is #6610 (documented-behavior). pydantic-ai's triage bot reproduced all three adapters and labelled the issue p:2-high and needs-maintainer-discussion (2026-10-25): the open question is whether a stream that ends before the provider's terminal event should report state 'incomplete'.

History

Version	Grade
2.61.0	✗ WRONG
2.56.0	✗ WRONG