NC Bench
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Run: 2026-02-16-01KHK96BXD2P7QBFNNRHYQTAFH
Run Details
Model:
GPT-5.1
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
27.6s
Cost:
$0.012321
Provider:
OpenAI
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain hammered the glass-paned conservatory. Detective Mara Quinn studied everything. The party had ended violently. Crystal shards glittered beside bodies. Music still played, eerily cheery. The host lay dead center. Scarlet wine soaked his tuxedo. No glass near his hand. But blood rimmed his lips. Guests huddled, whispering, avoiding her. Mara noticed one missing cufflink. The other gleamed under piano. She knelt, examining the keys. Middle C was smeared crimson. Someone had played while dying. Or after, Mara thought, colder. Outside, sirens wailed through fog. Inside, a clock chimed midnight. Everyone claimed simultaneous alibis, impossibly. Yet someone had locked doors. Windows were latched from within. The conservatory skylight showed rain. No footprints marked the soil. Mara smelled cordite, faint, lingering. The gun was missing entirely. She addressed the shaking guests. Nobody moved toward the exit. Lightning flashed, bleaching every face. In that instant, Mara decided. The killer remained among them.
created_at
"2026-02-16T13:11:15.919198+00:00"
2/16/2026, 1:11:15 PM
model
"openai/gpt-5.1-20251113"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5465
moderation_latency
(null)
generation_time
27375
tokens_prompt
46
tokens_completion
830
native_tokens_prompt
41
native_tokens_completion
1227
native_tokens_completion_images
0
native_tokens_reasoning
970
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
0.01232125
router
(null)
provider_responses
0
id
"resp_018be7c380d380c4016993175810d881969aaab4680e5d4264"
status
200
is_byok
false
latency
146
endpoint_id
"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.1-20251113"
api_type
"completions"
id
"gen-1771247447-Ztgoon6IkHCTfCegnZjT"
upstream_id
"resp_018be7c380d380c4016993175810d881969aaab4680e5d4264"
total_cost
0.01232125
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
99.2627%
Matches word count
n/a
neededClean
false
sentences
30
wordCounts
0
6
1
5
2
5
3
5
4
5
5
5
6
5
7
5
8
5
9
5
10
5
11
5
12
5
13
5
14
5
15
5
16
5
17
5
18
5
19
5
20
5
21
5
22
5
23
5
24
5
25
5
26
5
27
5
28
5
29
5