NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-16-01KHKB02FCX1XXYDX15WR66S7S
Run Details
Model:
GPT-5.1
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
20.3s
Cost:
$0.016661
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
Rain hammered the boardwalk as tourists scattered from thunder overhead. Detective Mara Quinn sheltered beneath the pier, watching the chaos. The carnival lights flickered, staining puddles with nervous, bleeding color. Somewhere beyond the Ferris wheel, a scream sliced the storm. Everyone nearby assumed another drunken fight, except the detective tonight. She knew panic's timbre, raw and rising, unmistakably different here. Mara moved toward the voice, shoes slipping on streaming planks. Beneath the rusted roller coaster, people formed a hesitant circle. At its center lay a man, face down, motionless there. Cheap carnival music warbled overhead, grotesquely cheerful funeral accompaniment tonight. Blood threaded between the boards, disappearing into the roaring ocean. A stuffed panda floated in it, soaking up darkness slowly. Mara knelt, fingers hovering above his neck, not touching yet. The crowd's chatter dimmed when they noticed her police badge. Lightning revealed his features: carnival manager Elias Kade, feared, charming. He was supposed to open tonight's fireworks, not headline morgues. Mara finally touched his skin; the warmth shocked her badly. Someone knelt opposite her, dripping seawater, eyes wide with terror. The woman whispered, trembling, barely audible above crashing waves everywhere. “I watched him drown on land, without any water today.”
created_at
"2026-02-16T13:42:39.807581+00:00"
2/16/2026, 1:42:39 PM
model
"openai/gpt-5.1-20251113"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
17789
moderation_latency
(null)
generation_time
20114
tokens_prompt
46
tokens_completion
370
native_tokens_prompt
41
native_tokens_completion
1661
native_tokens_completion_images
0
native_tokens_reasoning
1362
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
0.01666125
router
(null)
provider_responses
0
id
"resp_065cba568449081a0169931ebaef88819396c16774fa1cf427"
status
200
is_byok
false
latency
192
endpoint_id
"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.1-20251113"
api_type
"completions"
id
"gen-1771249338-wgdiqZTnQT6aLfevqIxP"
upstream_id
"resp_065cba568449081a0169931ebaef88819396c16774fa1cf427"
total_cost
0.01666125
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
20
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10
15
10
16
10
17
10
18
10
19
10