✓ PASS

vercel-ai 7.0.153

truncation.structured-output · openai-responses

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Requirements

IdLevelStatusEvidence
no-partial-successMUSTSATISFIEDstructured.attempted=true; structured.returned_as_success=false
cause-is-truncationMUSTSATISFIEDfinish.value="length" (primary: NoObjectGeneratedError.finishReason); truth.finish="length"; error.category="validation"; structured.returned_as_success=false
text-reportedSHOULDSATISFIEDtext.value="{\"islands\":[{\"name\":\"Κρήτη\",\"sea\":\"Κρητικό Πέ" (primary); truth.text="{\"islands\":[{\"name\":\"Κρήτη\",\"sea\":\"Κρητικό Πέ"
usage-reportedSHOULDSATISFIEDusage.input=68 (primary); truth.usage.input=68; usage.output=24 (primary); truth.usage.output=24

What the provider sent

Finish
length
Raw finish
max_output_tokens
Text
{"islands":[{"name":"Κρήτη","sea":"Κρητικό Πέ
Tool calls
[]
Usage
{
  "alternatives": {},
  "cached_input": 0,
  "input": 68,
  "output": 24,
  "raw": {
    "input_tokens": 68,
    "input_tokens_details": {
      "cache_write_tokens": 0,
      "cached_tokens": 0
    },
    "output_tokens": 24,
    "output_tokens_details": {
      "reasoning_tokens": 0
    },
    "total_tokens": 92
  },
  "reasoning": 0,
  "total": 92
}
Stream completed
null
Error
null
Wire excerpt
status: 200
content-type: application/json
body (json):
{
  "id": "resp_04ca3cce672b80e9006acbfbfeef9c87d1b371f55d49b29248",
  "object": "response",
  "created_at": 1791753214,
  "status": "incomplete",
  "access_programs": null,
  "background": false,
  "billing": {
    "payer": "developer"
  },
  "completed_at": null,
  "error": null,
  "frequency_penalty": 0.0,
  "incomplete_details": {
    "reason": "max_output_tokens"
  },
  "instructions": null,
  "max_output_tokens": 24,
  "max_tool_calls": null,
  "model": "gpt-6-luna",
  "moderation": null,
  "output": [
    {
      "id": "msg_04ca3cce672b80e9006acbfbffd3a087d1882b5ea5d91c9c0b",
      "type": "message",
      "status": "incomplete",
      "content": [
        {
          "type": "output_text",
          "annotations": [],
          "logprobs": [],
          "text": "{\"islands\":[{\"name\":\"Κρήτη\",\"sea\":\"Κρητικό Πέ"
        }
      ],
      "phase": "final_answer",
      "role": "assistant"
    }
  ],
  "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": "default",
  "store": true,
  "temperature": 1.0,
  "text": {
    "format": {
      "type": "json_schema",
      "description": null,
      "name": "output",
      "schema": {
        "type": "object",
        "properties": {
          "islands": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "name": {
                  "type": "string"
                },
                "sea": {
                  "type": "string"
                }
              },
              "required": [
                "name",
                "sea"
              ],
              "additionalProperties": false
            }
          }
        },
        "required": [
          "islands"
        ],
        "additionalProperties": false
      },
      "strict": true
    },
    "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": {
    "input_tokens": 68,
    "input_tokens_details": {
      "cache_write_tokens": 0,
      "cached_tokens": 0
    },
    "output_tokens": 24,
    "output_tokens_details": {
      "reasoning_tokens": 0
    },
    "total_tokens": 92
  },
  "user": null,
  "metadata": {}
}

What the library reported

Outcome
raised
Finish
{
  "raw": null,
  "source": "NoObjectGeneratedError.finishReason",
  "surface": "primary",
  "value": "length"
}
Text
Value
{"islands":[{"name":"Κρήτη","sea":"Κρητικό Πέ
Surface
primary
Tool calls
[]
Usage
{
  "cached_input": 0,
  "input": 68,
  "output": 24,
  "reasoning": 0,
  "surface": {
    "cached_input": "primary",
    "input": "primary",
    "output": "primary",
    "reasoning": "primary",
    "total": "primary"
  },
  "total": 92
}
Stream
{
  "chunks_seen": null,
  "completed": null,
  "used": false
}
Error
Type
AI_NoObjectGeneratedError
Message
No object generated: could not parse the response.
Category
validation
Retry after
null
Stack top
ai/dist/index.js:3755
Unsupported reason
null
Full observation JSON
{
  "elapsed_ms": 128.08004100000005,
  "error": {
    "category": "validation",
    "message": "No object generated: could not parse the response.",
    "retry_after": null,
    "stack_top": "ai/dist/index.js:3755",
    "type": "AI_NoObjectGeneratedError"
  },
  "finish": {
    "raw": null,
    "source": "NoObjectGeneratedError.finishReason",
    "surface": "primary",
    "value": "length"
  },
  "format": "wiretruth.observation/v1",
  "library": {
    "api": "generateText",
    "language": "javascript",
    "name": "vercel-ai",
    "version": "7.0.153"
  },
  "notes": [],
  "outcome": "raised",
  "stream": {
    "chunks_seen": null,
    "completed": null,
    "used": false
  },
  "structured": {
    "attempted": true,
    "returned_as_success": false,
    "value": null
  },
  "text": {
    "surface": "primary",
    "value": "{\"islands\":[{\"name\":\"Κρήτη\",\"sea\":\"Κρητικό Πέ"
  },
  "tool_calls": [],
  "unsupported_reason": null,
  "usage": {
    "cached_input": 0,
    "input": 68,
    "output": 24,
    "reasoning": 0,
    "surface": {
      "cached_input": "primary",
      "input": "primary",
      "output": "primary",
      "reasoning": "primary",
      "total": "primary"
    },
    "total": 92
  }
}

Fixture

recorded openai-responses/truncation.structured-output

ProvenanceValue
Recorded at2026-10-11T21:13:34Z
Requested modelgpt-6-luna
Returned modelgpt-6-luna
CI runhttps://github.com/kartsan03/wiretruth/actions/runs/38175457862

Reproduce

wiretruth serve openai-responses/truncation.structured-output

Plain-library snippet from the shim manifest.

createOpenAI({ baseURL: WIRETRUTH_BASE_URL_OPENAI_RESPONSES, apiKey })(model); default Responses entry point

Upstream

No matching upstream report.

History

VersionGrade
7.0.153✓ PASS
7.0.146✓ PASS
7.0.142✓ PASS