NC Bench
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Run: 2026-02-16-01KHKASRZ225R8P90N8TJFVJSB
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
18.1s
Cost:
$0.000612
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
The fog clung to the harbor like a sly conspirator. Moonlight fractured across rippling water, revealing drowned letters beneath lanterns. A bell tolled somewhere unseen, summoning a roomful of strangers. In the study, a lamp hissed, abandoning a crimson silence. A body lay beneath velvet shadows, eyes open, mouth curved. The detective arrived quietly, cataloging scents of tobacco and rain. Footsteps echoed beyond doors, as rumors gnawed at polished brass. Every object whispered motive, every alibi wore fragile, glittering thread. Outside, a ship moaned, its hull sunk in unspoken guilt. Somewhere inside, a clock breathed, marking a day turning perilous.
created_at
"2026-02-16T13:39:10.807048+00:00"
2/16/2026, 1:39:10 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2127
moderation_latency
(null)
generation_time
17879
tokens_prompt
46
tokens_completion
992
native_tokens_prompt
41
native_tokens_completion
1524
native_tokens_completion_images
0
native_tokens_reasoning
1344
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
0.00061165
router
(null)
provider_responses
0
id
"resp_0163cfb9288f75400169931dec95888195b32aeaf5cbb91d66"
status
200
is_byok
false
latency
111
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771249132-ZJbmg9OPNcRnbbsnpyml"
upstream_id
"resp_0163cfb9288f75400169931dec95888195b32aeaf5cbb91d66"
total_cost
0.00061165
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
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10