NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-16-01KHKARA767T88VAPWQQ96SFXB
Run Details
Model:
GPT-5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
39.2s
Cost:
$0.024601
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 stitched the harbor in silver, needles threading night's hush. Sirens braided distant streets, then strangled themselves into uneasy silence. Detective Mora unlocked Harrow House, rust scraping like reluctant matches. The foyer smelled of lilies disguising something heavier, recently disturbed. Footprints glittered wetly across marble, a hesitant choreography towards darkness. On the staircase landing, a pocketwatch ticked without a wrist. Mora clicked her pen, the sound defiant against layered quiet. He lay beneath the portrait, eyes open, considering nothing now. Blood made a slow compass, pointing north, pointing somewhere upstairs. The portrait's subject, his grandmother, watched sternly, hands forever folded. In her painted lap, an identical pocketwatch glittered like testimony. Lightning pasted windowpanes white; shadows flinched and rearranged their alibis. A neighbor knocked once, stopped, then whispered apologies to nobody. Mora knelt, noticing varnish under nails, and lily pollen streaks. Upstairs, a music box chimed two notes, then reconsidered breathing. The phone still dangled, swinging softly, confessing to no one. On the table, invitations promised charity; the knife promised accuracy. Rain gathered courage outside; inside, secrets arranged careful disguises slowly. Mora tallied rhythms: ticking watch, fading sirens, steady heartbeat, motive. Somewhere deeper, a lock sighed, as though finally remembering mouths.
created_at
"2026-02-16T13:38:44.330731+00:00"
2/16/2026, 1:38:44 PM
model
"openai/gpt-5-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
8783
moderation_latency
(null)
generation_time
38908
tokens_prompt
46
tokens_completion
1107
native_tokens_prompt
41
native_tokens_completion
2455
native_tokens_completion_images
0
native_tokens_reasoning
2112
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
0.02460125
router
(null)
provider_responses
0
id
"resp_060fe19a503832bb0169931dbcbb888195a523d80ae74f57d3"
status
200
is_byok
false
latency
168
endpoint_id
"7c2f859a-7890-4e8e-b1de-1cd1c0a800b4"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-2025-08-07"
api_type
"completions"
id
"gen-1771249084-iUpWJuCyc2XuvThIdDrP"
upstream_id
"resp_060fe19a503832bb0169931dbcbb888195a523d80ae74f57d3"
total_cost
0.02460125
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