✗ WRONG

any-llm 1.40.2

finish.unknown-value · anthropic

Requirements

Id	Level	Status	Evidence
response-returned	MUST	SATISFIED	outcome=returned; error.category=null; truth.error=null
finish-is-other	MUST	CONTRADICTED	finish.value="stop" (primary: choices[0].finish_reason); truth.finish="other"; required finish="other"
text-reported	MUST	SATISFIED	text.value="Octopuses change colour by" (primary); truth.text="Octopuses change colour by"
raw-finish-reported	SHOULD	CONTRADICTED	finish.raw="stop"; truth.raw_finish="WIRETRUTH_UNKNOWN_REASON"

What the provider sent

Finish: other
Raw finish: WIRETRUTH_UNKNOWN_REASON
Text: Octopuses change colour by
Tool calls: []
Usage: { "alternatives": {}, "cached_input": null, "input": 25, "output": 16, "raw": { "input_tokens": 25, "output_tokens": 16, "output_tokens_details": { "thinking_tokens": 8 } }, "reasoning": 8, "total": 41 }
Stream completed: null
Error: null

Wire excerpt

status: 200
content-type: application/json
body (json):
{
  "id": "msg_01Aq9w938a90dw8q",
  "type": "message",
  "role": "assistant",
  "content": [
    {
      "type": "thinking",
      "thinking": "",
      "signature": "EqQBCgIYAhIM1gbcDa9GJwZA2b3hGgxBdjrkzLoky3dl1pkiMOYds..."
    },
    {
      "type": "text",
      "text": "Octopuses change colour by"
    }
  ],
  "model": "claude-sonnet-5-5",
  "stop_reason": "WIRETRUTH_UNKNOWN_REASON",
  "stop_sequence": null,
  "stop_details": null,
  "usage": {
    "input_tokens": 25,
    "output_tokens": 16,
    "output_tokens_details": {
      "thinking_tokens": 8
    }
  }
}

What the library reported

Outcome

returned

Finish

{
  "raw": "stop",
  "source": "choices[0].finish_reason",
  "surface": "primary",
  "value": "stop"
}

Text

Value: Octopuses change colour by
Surface: primary

Tool calls

[]

Usage

{
  "cached_input": null,
  "input": 25,
  "output": 16,
  "reasoning": null,
  "surface": {
    "cached_input": "absent",
    "input": "primary",
    "output": "primary",
    "reasoning": "absent",
    "total": "primary"
  },
  "total": 41
}

Stream

{
  "chunks_seen": null,
  "completed": null,
  "used": false
}

Error

null

Unsupported reason

null

Full observation JSON

{
  "elapsed_ms": 148.27326126396656,
  "error": null,
  "finish": {
    "raw": "stop",
    "source": "choices[0].finish_reason",
    "surface": "primary",
    "value": "stop"
  },
  "format": "wiretruth.observation/v1",
  "library": {
    "api": "any_llm.completion",
    "language": "python",
    "name": "any-llm",
    "version": "1.40.2"
  },
  "notes": [],
  "outcome": "returned",
  "stream": {
    "chunks_seen": null,
    "completed": null,
    "used": false
  },
  "structured": {
    "attempted": false,
    "returned_as_success": false,
    "value": null
  },
  "text": {
    "surface": "primary",
    "value": "Octopuses change colour by"
  },
  "tool_calls": [],
  "unsupported_reason": null,
  "usage": {
    "cached_input": null,
    "input": 25,
    "output": 16,
    "reasoning": null,
    "surface": {
      "cached_input": "absent",
      "input": "primary",
      "output": "primary",
      "reasoning": "absent",
      "total": "primary"
    },
    "total": 41
  }
}

Fixture

derived anthropic/finish.unknown-value

Provenance	Value
Transform	replace_finish_value
Source fixture	anthropic/truncation.text
Rationale	The provider sends a finish value that a library may not recognize.
Evidence	https://github.com/BerriAI/litellm/issues/21347

Reproduce

wiretruth serve anthropic/finish.unknown-value

Plain-library snippet from the shim manifest.

any_llm.completion(model=model, provider='anthropic', api_base=WIRETRUTH_BASE_URL_ANTHROPIC, api_key=WIRETRUTH_API_KEY); host root, SDK appends /v1/messages and uses x-api-key

Upstream

documented-behavior

Fixed in: not specified

any-llm documents the fallback: Anthropic stop reasons without an OpenAI counterpart (stop_sequence, pause_turn) fall through to stop, and the lookup defaults to stop for any unfamiliar value (https://github.com/mozilla-ai/any-llm/blob/1.33.0/src/any_llm/providers/anthropic/utils.py#L40-L50, unchanged on main at 18ed82b). The caller cannot tell such a stop from a normal one.

History

Version	Grade
1.40.2	✗ WRONG
1.38.0	✗ WRONG
1.33.0	✗ WRONG