Run: 2026-04-24-01KQ0PTH5TR9KAZXE50BTVSJJF

Run Details

Model:
GPT-5.5
Duration:
5.8s
Cost:
$0.004675
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
9.62% 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 needled the manor windows as Inspector Vale arrived, summoned by a letter penned in trembling blue ink tonight. Inside, twelve dinner guests stood speechless around Lord Ashcombe, whose silver dessert knife protruded from his throat. The grandfather clock struck midnight twice, then stopped, as though ashamed to witness what followed in silence. Lady Ashcombe clutched her pearls, but one white glove was missing from her shaking left hand tonight. On the carpet, a trail of cigar ash curved neatly toward the locked library door behind them. Vale noticed the dead man's pocket watch still ticking, though its glass face was cracked at eleven. Then from upstairs came a child's laugh, delicate and impossible, because the nursery had burned years earlier.
created_at"2026-04-24T21:37:36.962Z" 4/24/2026, 9:37:36 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency690
moderation_latency(null)
generation_time5603
tokens_prompt46
tokens_completion201
native_tokens_prompt41
native_tokens_completion149
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"
usage0.004675
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_094eba2330ee459b0169ebe2a117cc8194bf68061f56d7e181"
is_byokfalse
latency260
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-1777066657-ncXRaQgU2jmGj8mSivBo"
session_id(null)
api_type"completions"
id"gen-1777066657-7VT3YkLiKLOQFlkeZkAQ"
upstream_id"resp_094eba2330ee459b0169ebe2a117cc8194bf68061f56d7e181"
total_cost0.004675
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
9.62% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
019
117
217
317
417
517
617