NC Bench
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Run: 2026-02-16-01KHK9SEY24R6C9GV4ZQNMNQ6E
Run Details
Model:
GPT-5.1
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
18.9s
Cost:
$0.013671
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 old manor, drowning whispers beneath relentless thunder. Detective Mara Quinn arrived late, headlights slicing through swirling mist. Inside, guests clustered nervously, clutching glasses, studying unfamiliar frightened faces. The host, Victor Langford, lay missing, his chair conspicuously empty. On polished floorboards, muddy footprints meandered like careless punctuation there. Lightning flashed, revealing portraits whose painted eyes followed every movement. From the library, a scream burst, high, ragged, abruptly silenced. Mara ran toward it, hand brushing the holstered service pistol. Books lay scattered like fallen soldiers, pages fluttering in breeze. Atop the Persian rug, Victor sprawled, throat opened with precision. Blood threaded through carpet patterns, transforming flowers into red galaxies. A single playing card rested beside him, edges perfectly clean. The queen of hearts stared upward, unblinking, like mocking witness. Windows were latched, fireplace cold, every exit seeming thoroughly watched. Mara noted trembling hands, averted eyes, secrets crowding the air. Somewhere within that room, behind courteous smiles, the murderer listened.
created_at
"2026-02-16T13:21:33.167482+00:00"
2/16/2026, 1:21:33 PM
model
"openai/gpt-5.1-20251113"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4763
moderation_latency
(null)
generation_time
18605
tokens_prompt
46
tokens_completion
830
native_tokens_prompt
41
native_tokens_completion
1362
native_tokens_completion_images
0
native_tokens_reasoning
1114
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
0.01367125
router
(null)
provider_responses
0
id
"resp_0b7577fee9e1e77401699319c9d6148197b5278dcdc6204d51"
status
200
is_byok
false
latency
168
endpoint_id
"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.1-20251113"
api_type
"completions"
id
"gen-1771248073-uYYoQSuH7VBmrzBtDXfz"
upstream_id
"resp_0b7577fee9e1e77401699319c9d6148197b5278dcdc6204d51"
total_cost
0.01367125
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
16
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