NC Bench
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Run: 2026-02-16-01KHK9JHT6AFM6HTQGDDFFWNWT
Run Details
Model:
GPT-5
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
39.7s
Cost:
$0.024201
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 needled the sleeping town. Streetlights hummed like patient witnesses. Somewhere, a clock refused silence. Detective Mara Bell arrived early. The call had sounded routine. Routine never stayed routine long. Blue tape fluttered like ribbon. Neighbors watched through twitching curtains. The bungalow door hung ajar. Wet footprints marred the threshold. Inside, the air tasted coppery. A metronome ticked, relentless, solitary. Music sheets carpeted the piano. On middle C, blood pooled. The body faced the wall. Eyes open, mouth rehearsing disbelief. A violin string cinched wrist. Another bridled the swollen throat. No forced entry, no struggle. Rain drowned any departing prints. Mara noted the mantel clock. Its hands pointed accusingly backward. On the sill, one tulip. It bowed like guilty testimony. A note waited beneath saucer. Blue ink bled three words. Play me, then please run. She heard distant laughter fracture. The clock skipped a beat. Somewhere nearby, a violin tuned. Rain kept time with dread. Mara whispered to the metronome. Tell me who conducts this. It answered with perfect tempo. Outside, sirens braided the rain. Inside, silence tightened its bow.
created_at
"2026-02-16T13:18:07.51505+00:00"
2/16/2026, 1:18:07 PM
model
"openai/gpt-5-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4331
moderation_latency
(null)
generation_time
39573
tokens_prompt
46
tokens_completion
1034
native_tokens_prompt
41
native_tokens_completion
2415
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
0.02420125
router
(null)
provider_responses
0
id
"resp_0ad6072a1a33802901699318e751e88197b6aa80a5a89d615c"
status
200
is_byok
false
latency
199
endpoint_id
"7c2f859a-7890-4e8e-b1de-1cd1c0a800b4"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-2025-08-07"
api_type
"completions"
id
"gen-1771247847-KCJaJ8Xxm2gJnBUxVy1H"
upstream_id
"resp_0ad6072a1a33802901699318e751e88197b6aa80a5a89d615c"
total_cost
0.02420125
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
36
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
35
5