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Run: 2026-03-18-01KM07ZYSR30C2VVZ9GXDEJ212
Run Details
Model:
GPT-5.4 Nano (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
3.9s
Cost:
$0.000967
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
Rain stitched the harbor docks as Inspector Vale arrived, notebook ready, searching for answers in a silent warehouse tonight alone. Behind locked doors, dockworkers found Captain Merritt slumped beside crates, his revolver missing, his eyes fixed upward still cold there. The coroner said no struggle marks appeared, yet seawater smelled on the floorboards, oddly fresh for such late hours here. Vale interviewed Maris Crowe, Merritt’s accountant, who wore grief like perfume and insisted she’d left early yesterday at dawn quietly. A ledger page lay torn, and on its margin someone had sketched a compass rose, pointing west toward the icehouse. When Vale lifted the body’s coat, he noticed salt lines spelling initials: V.M., then stopped shivering at once in silence.
created_at
"2026-03-18T10:31:20.645Z"
3/18/2026, 10:31:20 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3538
moderation_latency
(null)
generation_time
3606
tokens_prompt
46
tokens_completion
202
native_tokens_prompt
41
native_tokens_completion
767
native_tokens_completion_images
0
native_tokens_reasoning
599
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
0.00096695
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_06885a3fca2860650169ba7ef8b2e4819784de145897c0cfb7"
is_byok
false
latency
178
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-1773829880-PxqmlExguqb16lQfFkz9"
upstream_id
"resp_06885a3fca2860650169ba7ef8b2e4819784de145897c0cfb7"
total_cost
0.00096695
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