NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-16-01KHKAXQF7R29CJ75R5DNT2RD7
Run Details
Model:
GPT-5.1
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
28.3s
Cost:
$0.023561
Provider:
OpenAI
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain hammered the sleepy town. Sirens wailed against distant thunder. Detective Mara Quinn arrived late. Headlights carved through the fog. Harbor Street glistened like oil. Police tape fluttered, yellow, accusing. Officers hunched beneath dripping awnings. Radios crackled with clipped urgency. The Gull's Nest sign flickered. Inside, music played without listeners. Glass crunched under Mara's boots. The bar smelled of bleach. Someone had cleaned, then stopped. A single stool stood overturned. Blood mapped arcs across wood. The jukebox hummed, note dying. Body lay behind the counter. White shirt, black vest, lifeless. Eyes stared upward, demanding explanation. Stormlight shimmered on the knife. Handle protruded from his throat. No splatter marked surrounding surfaces. Mara noted absence of struggle. This murder wanted careful reading. She checked the silent doorway. Rain pattered, masking approaching footsteps. In the mirror, something moved. Not her reflection, someone behind. Mara turned, gun already rising. The lights died without warning. Darkness swallowed the room whole. A chair scraped, then silence. Somewhere nearby, a watch ticked. Mara smelled cordite beneath bleach. There was someone else watching.
created_at
"2026-02-16T13:41:30.696567+00:00"
2/16/2026, 1:41:30 PM
model
"openai/gpt-5.1-20251113"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3442
moderation_latency
(null)
generation_time
28051
tokens_prompt
46
tokens_completion
1207
native_tokens_prompt
41
native_tokens_completion
2351
native_tokens_completion_images
0
native_tokens_reasoning
2055
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
0.02356125
router
(null)
provider_responses
0
id
"resp_01399f50e1d3ced10169931e6e235c81979b5d59f8fbbdaca5"
status
200
is_byok
false
latency
178
endpoint_id
"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.1-20251113"
api_type
"completions"
id
"gen-1771249262-SPvmaq26StOTrm1a6c3A"
upstream_id
"resp_01399f50e1d3ced10169931e6e235c81979b5d59f8fbbdaca5"
total_cost
0.02356125
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
35
wordCounts
0
5
1
5
2
5
3
5
4
5
5
5
6
5
7
5
8
5
9
5
10
5
11
5
12
5
13
5
14
5
15
5
16
5
17
5
18
5
19
5
20
5
21
5
22
5
23
5
24
5
25
5
26
5
27
5
28
5
29
5
30
5
31
5
32
5
33
5
34
5