NC Bench
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Run: 2026-02-16-01KHKA8CSGSW4ZFRCSPRMPD55X
Run Details
Model:
GPT-5.1
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
18.4s
Cost:
$0.012551
Provider:
OpenAI
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
Messages
Meta
AI
Rain hammered the seaside hotel as Detective Mara Quinn studied the faded carpet, awaiting the evening's tedious charity banquet alone. The guests drifted through the lobby, sequins glittering, false laughter rising, masking tensions she'd learned to hear beneath every toast. Hotel manager Victor Hale approached nervously, twisting his cufflinks, whispering that a donor threatened cancellation over some missing artwork upstairs. Mara followed him toward the elevator, noting smeared fingerprints on brass buttons and a single crimson thread caught there earlier. On the sixth floor, the corridor smelled of chlorine and perfume, carpet muffling their footsteps toward the locked penthouse suite. Victor's keycard trembled in the slot, red light blinking twice before accepting, as thunder rolled like distant, disapproving applause outside. The suite's lights were off, curtains billowing from an open balcony door, letting in rain, salt, and something metallic unmistakable. Lightning flashed, revealing billionaire patron Charles Renner sprawled across the white piano, throat opened neatly, blood veining ivory keys below. Rain speckled his polished shoes, impossible from this angle, and Mara knew the balcony scene had been deliberately constructed earlier. Downstairs, the orchestra struck its first waltz, while upstairs Mara quietly locked the door, announcing everyone's evening had changed forever.
created_at
"2026-02-16T13:29:41.683988+00:00"
2/16/2026, 1:29:41 PM
model
"openai/gpt-5.1-20251113"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
16884
moderation_latency
(null)
generation_time
18227
tokens_prompt
46
tokens_completion
365
native_tokens_prompt
41
native_tokens_completion
1250
native_tokens_completion_images
0
native_tokens_reasoning
974
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
usage
0.01255125
router
(null)
provider_responses
0
id
"resp_03b819e3a6e1e69c0169931bb320ac8196874ea9cdacc0336a"
status
200
is_byok
false
latency
225
endpoint_id
"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.1-20251113"
api_type
"completions"
id
"gen-1771248563-h6Wm39fSRc81S42qk6xn"
upstream_id
"resp_03b819e3a6e1e69c0169931bb320ac8196874ea9cdacc0336a"
total_cost
0.01255125
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20