NC Bench
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Run: 2026-02-16-01KHK9GQVVMRXSAFDE74ZFGNT4
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
25.7s
Cost:
$0.000876
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
Fog hung over the harbor as the clock struck midnight. The lantern trembled, casting a pale halo on rain-slick cobbles. A body lay beneath the pier, eyes wide with fear. The detective arrived unseen, cloak brushing cobbles, notebook ready tonight. Neighbors whispered rumors, but silence clung stubbornly to every doorway. The tide hissed secrets, washing footprints toward nowhere, drawing questions. A gull cried overhead, interrupted only by distant thunderclaps nearby. The victim's ring gleamed, bearing initials nobody could recognize ever. Cold rain tapped a rhythm, matching suspects' nervous, deliberate shifting. The case would begin when truth intruded upon comfortable lies.
created_at
"2026-02-16T13:16:53.998637+00:00"
2/16/2026, 1:16:53 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1765
moderation_latency
(null)
generation_time
25469
tokens_prompt
46
tokens_completion
934
native_tokens_prompt
41
native_tokens_completion
2185
native_tokens_completion_images
0
native_tokens_reasoning
1984
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
0.00087605
router
(null)
provider_responses
0
id
"resp_0b0d7b3c056c491601699318abf9848195a7b8064761d21cb2"
status
200
is_byok
false
latency
129
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771247787-9Xilu8LFTuVmCxo3pZYB"
upstream_id
"resp_0b0d7b3c056c491601699318abf9848195a7b8064761d21cb2"
total_cost
0.00087605
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
97.4082%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
10
1
11
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10