NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-16-01KHKB0MCM4Z47RV2DV0SGTEMZ
Run Details
Model:
GPT-5 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
28.6s
Cost:
$0.005260
Provider:
OpenAI
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 tapped the high windows as Inspector Hale stepped into the drawing room, boots leaving dark arcs on marble tiles. A body lay beneath the chandelier, face obscured by a silk scarf and one white glove stiff as frozen porcelain. Guests clustered by the windows, voices hushed into frightened whispers as lightning sketched pale fingers across their faces and portraits. Lady Ashcombe clung to a gilded chair, knuckles white beneath her lace gloves, lips trembling without sound since the murder. The butler's hands shook when offering tea, a thin smile refusing to reach eyes milky with suppressed panic and duty. Inspector Hale crouched near the corpse, examining a smear of crimson on the carpet with meticulous measured care and patience. Outside, a clock began to chime midnight, each toll folding another second into a room suddenly full of accusation now.
created_at
"2026-02-16T13:43:06.255484+00:00"
2/16/2026, 1:43:06 PM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
26041
moderation_latency
(null)
generation_time
28379
tokens_prompt
46
tokens_completion
224
native_tokens_prompt
41
native_tokens_completion
2625
native_tokens_completion_images
0
native_tokens_reasoning
2432
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
0.00526025
router
(null)
provider_responses
0
id
"resp_0be675ffe0631dc00169931ecd48dc81969b72fb2ec3e4b560"
status
200
is_byok
false
latency
137
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771249357-alhi3a4blSbJltezfgcm"
upstream_id
"resp_0be675ffe0631dc00169931ecd48dc81969b72fb2ec3e4b560"
total_cost
0.00526025
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20