NC Bench
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Run: 2026-02-16-01KHKA95A66ZQ1C5TMW7GPK77A
Run Details
Model:
GPT-5.1
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
21.6s
Cost:
$0.010751
Provider:
OpenAI
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 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 manor as detectives gathered for supper. Lightning flashed, briefly illuminating the cliffside drop beyond the terrace. Detective Mara Vance removed her coat, eyes scanning nervous faces. The host, Victor Harrow, raised crystal glass with practiced charm. His smile faltered when thunder drowned the gramophone's scratchy waltz. A servant whispered something urgent; Victor's knuckles whitened around cutlery. Mara followed them through swinging doors into the shadowed kitchen. There, beneath hanging copper pans, the chef lay unnaturally still. Blood trickled across tiles, pooling beneath broken bottle of burgundy. The windows were latched; only one doorway led here tonight. Mara knelt, noticing flour footprints circling, then stopping abruptly short. Behind her, someone softly locked the door, turning key twice.
created_at
"2026-02-16T13:30:10.684677+00:00"
2/16/2026, 1:30:10 PM
model
"openai/gpt-5.1-20251113"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3099
moderation_latency
(null)
generation_time
20500
tokens_prompt
46
tokens_completion
799
native_tokens_prompt
41
native_tokens_completion
1070
native_tokens_completion_images
0
native_tokens_reasoning
884
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
0.01075125
router
(null)
provider_responses
0
id
"resp_06cf0b096e1a386b0169931bcc347c8197a53df00a7c70565e"
status
200
is_byok
false
latency
173
endpoint_id
"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.1-20251113"
api_type
"completions"
id
"gen-1771248588-ZGXEhfVegvC8d9T4G1iX"
upstream_id
"resp_06cf0b096e1a386b0169931bcc347c8197a53df00a7c70565e"
total_cost
0.01075125
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
12
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10