NC Bench
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Run: 2026-02-16-01KHK95ZP0NKXMC5GEF1V3BRE2
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
32.5s
Cost:
$0.001180
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
The rain pattered on the manor roof as hairline thunder murmured, while the guest list whispered secrets through chandeliers tonight. In the library, the clock sighed, and a body lay beneath the map of forgotten routes while candles flickered softly. The detective arrived unseen, noting fingerprints in frost on the window and the silence between guests turning deliberate that night. A telegram lay crumpled by the door, counting favors owed and favors withheld, as motive long simmered patiently beneath silence. Outside, rain sketched beads on glass, outlining footprints circling the terrace and converging toward a single, unlit conservatory door tonight. I am a guest, they tell me nothing, yet every breath I draw seems to echo a hidden accusation tonight. The room narrowed, witnesses gathered, doors sealed, and the storm outside attempted to erase the truth with roaring pretensions tonight. Who killed, and why, when every alibi sounded rehearsed and every smile concealed a lie beneath polished surfaces tonight, perhaps?
created_at
"2026-02-16T13:11:08.301546+00:00"
2/16/2026, 1:11:08 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
6754
moderation_latency
(null)
generation_time
32316
tokens_prompt
46
tokens_completion
996
native_tokens_prompt
41
native_tokens_completion
2944
native_tokens_completion_images
0
native_tokens_reasoning
2688
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
0.00117965
router
(null)
provider_responses
0
id
"resp_0175743e9a0a740b016993174b92748196afdbe1164b23956e"
status
200
is_byok
false
latency
140
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771247435-sgvJu2ztznYA8QL4joBV"
upstream_id
"resp_0175743e9a0a740b016993174b92748196afdbe1164b23956e"
total_cost
0.00117965
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20