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Run: 2026-03-18-01KM0AHW0FFDP9G43DV94PGBJG
Run Details
Model:
GPT-5.4 Nano (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.1s
Cost:
$0.001239
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
100.00%
Matches word count
(details)
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
The rain tapped the manor windows as Detective Marlowe arrived, summoned by a single scream from the conservatory tonight alone. Inside, servants whispered that Lord Sutter vanished, yet his study door hung open like a warning for anyone daring entry. A body lay beside the orchids, pale as paper, with ink stains circling his lifeless right hand beneath lamplight quietly. Marlowe knelt, breathing carefully, and noticed a torn letter sealed with wax from Parliament in pocket of the victim's coat. Mrs. Hale insisted she heard music, then footsteps, but claimed she never looked toward the cry until Marlowe asked questions. Beyond the curtains, a locked gate rattled, suggesting someone exited after the murder occurred yet left no prints on gravel.
created_at
"2026-03-18T11:16:04.766Z"
3/18/2026, 11:16:04 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5768
moderation_latency
(null)
generation_time
5967
tokens_prompt
46
tokens_completion
195
native_tokens_prompt
41
native_tokens_completion
985
native_tokens_completion_images
0
native_tokens_reasoning
821
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
0.00123945
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_0865fe5f8dbad8cf0169ba8974da7c81949244724c6f3151c3"
is_byok
false
latency
202
model_permaslug
"openai/gpt-5.4-nano-20260317"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer
(null)
api_type
"completions"
id
"gen-1773832564-HyaQ6tIxWV24HnXvMiE9"
upstream_id
"resp_0865fe5f8dbad8cf0169ba8974da7c81949244724c6f3151c3"
total_cost
0.00123945
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20