AI API receipt · vllm-project/vllm
vllm-project/vllm#60875 · upstream bug reproduced by running the issue's own reproduction
✓ Badgr rejects this response
use_beam_search + echo + logprobs(1) on facebook/opt-125m answered 500 with an empty error message (an unhandled AssertionError in beam search's prompt-logprobs path) instead of a 400 naming the conflicting parameters.
Outcome contract verdict: response is empty. The attempt is recorded as failed (invalid_outcome) instead of a verified success, so it is not billed as a good answer and can fall back to another route.
The output the bug produces, taken from the issue’s reproduction and fed to Badgr’s validators. Not a live provider call.
text: none tool_calls: none
Written by Badgr’s receipt ledger and read back from GET /v1/receipts/replay-vllm-60875-beam-search-echo-logprobs-500.
{
"request_id": "replay-vllm-60875-beam-search-echo-logprobs-500",
"status": "failed",
"endpoint": "/v1/completions",
"stream": false,
"failure_stage": "outcome_contract",
"error_code": "invalid_outcome",
"error_message": "Response did not satisfy the outcome contract: response is empty",
"retryable": true,
"provider_mode": "replay",
"routing_decision": "replayed_upstream_output",
"created_at": "1791632037.517389"
}Recorded 2026-10-10 in Badgr’s local development environment. Replay cases and verdicts are pinned by backend/test_ai_api_replay_cases.py.
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