Run: 2026-04-24-01KQ0PEB3VYMP2BZHY66FE6KMR

Run Details

Model:
GPT-5.5
Duration:
5.6s
Cost:
$0.004735
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
2.42% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain stitched silver threads across Blackthorn Hall, while Inspector Vale counted ten dinner guests and one empty chair. At midnight, the grandfather clock coughed once, then stopped, leaving the house breathing like a buried animal. Lady Marwick laughed too loudly, raising her glass toward portraits that watched with varnished, accusing, patient eyes. In the library, a fire collapsed, revealing mud on the carpet and blood beneath the desk. Vale found Sir Edmund face-down beside an overturned chessboard, a black queen clenched between his stiff fingers. No window stood open, no servant had screamed, and every key remained inside its proper lock. Yet the dead man’s watch ticked steadily backward, marking minutes none of the living remembered spending.
created_at"2026-04-24T21:30:57.55Z" 4/24/2026, 9:30:57 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2393
moderation_latency(null)
generation_time5417
tokens_prompt46
tokens_completion196
native_tokens_prompt41
native_tokens_completion151
native_tokens_completion_images0
native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.004735
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_026604a63c8dbdd10169ebe111b7888193ba6fe586620c1233"
is_byokfalse
latency376
model_permaslug"openai/gpt-5.5-20260423"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777066257-dem0Of4oTuL3tVvZRRsz"
session_id(null)
api_type"completions"
id"gen-1777066257-2NjYF4JRqGpbgqXCXYm6"
upstream_id"resp_026604a63c8dbdd10169ebe111b7888193ba6fe586620c1233"
total_cost0.004735
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
2.42% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
018
117
217
316
417
516
616