NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-03-18-01KM08ZT7JSYJ3EAN2WAEWF4W2
Run Details
Model:
GPT-5.4 Nano (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
14.0s
Cost:
$0.001368
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
100.00%
Matches word count
(details)
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
Rain streaked the courthouse steps as Detective Mara Quinn arrived, coat dripping, searching for the missing gavel before sunrise today. Inside, the clerk whispered that Judge Ellery had died quietly, yet the room smelled of lilacs and smoke too strangely. Uniforms sealed the jury box, and Mara noted fresh mud prints leading from the coat stand to glass doors outside. On the floor lay a broken watch, stopped at 3:17, beside a torn ribbon from her own file folder case. When she knelt, the judge's spectacles gleamed, and a single drop of ink marked his cuff precisely at midnight exactly. The coroner reported no struggle, but the ceiling fan turned slowly, despite sealed vents above where no draft should exist. Mara asked for the bailiff, and he answered with trembling hands, pointing toward the locked storeroom door right behind her. The latch clicked open, revealing a violin case, still warm, and a note written in lilac ink for her alone.
created_at
"2026-03-18T10:48:44.542Z"
3/18/2026, 10:48:44 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
13431
moderation_latency
(null)
generation_time
13763
tokens_prompt
46
tokens_completion
846
native_tokens_prompt
41
native_tokens_completion
1088
native_tokens_completion_images
0
native_tokens_reasoning
874
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
0.0013682
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_06ed91bb5dfdcf960169ba830ca89081949e254ab89225aed4"
is_byok
false
latency
273
model_permaslug
"openai/gpt-5.4-nano-20260317"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer
(null)
api_type
"completions"
id
"gen-1773830924-Z6l5NTJHxCa0I9pGpQ41"
upstream_id
"resp_06ed91bb5dfdcf960169ba830ca89081949e254ab89225aed4"
total_cost
0.0013682
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
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