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Run: 2026-03-18-01KM08WJD9N4NBWJ7N754FKWTK
Run Details
Model:
GPT-5.4 Nano (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
5.7s
Cost:
$0.001261
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 stitched black lines on Marlowe Pier as Detective Sloane arrived, coat dripping, at dawn's reluctant hush today alone. Harbor manager Wicks waved him toward the warehouse, where a locked door hid screams and salt-stained footprints since last night. Inside, glass cases lay smashed, and Elias Trent’s body slumped beside ledger books, throat neatly severed beneath a flickering worklamp. Sloane knelt, noticing a silver locket still warm, and a single white glove resting on bricks like invitation for questions. Wicks insisted Trent argued with the dockmaster, yet no one saw him leave that evening or return, despite posted guards. As Sloane photographed the scene, a distant siren synchronized with his thoughts: someone wanted secrecy here and knew watchman routes.
created_at
"2026-03-18T10:46:58.231Z"
3/18/2026, 10:46:58 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4823
moderation_latency
(null)
generation_time
5571
tokens_prompt
46
tokens_completion
202
native_tokens_prompt
41
native_tokens_completion
1002
native_tokens_completion_images
0
native_tokens_reasoning
829
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
0.0012607
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_056d6e7a89694dd70169ba82a24a2081908f462b70a39ed930"
is_byok
false
latency
214
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-1773830818-bsnWo3I3YR7cvcsLzzVb"
upstream_id
"resp_056d6e7a89694dd70169ba82a24a2081908f462b70a39ed930"
total_cost
0.0012607
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