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Run: 2026-03-18-01KM0ATDFV4XH6PVQ9V8VCM1EV
Run Details
Model:
GPT-5.4 Nano (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
4.7s
Cost:
$0.001209
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
Dusk settled over Briar Hollow as Detective Mara Keene arrived, summoned by shrieks from the locked riverside conservatory tonight alone. Inside, gaslights flickered, casting shadows across orchids, and Constable Weller hovered, clutching a damp brass keyring for the door's security. The victim, Elias Thorne, lay beside a shattered fountain, one glove missing, the rest pinned by spilled ink onto marble. Mara studied the lock plates; none showed forced entry, yet a thin smell of almonds lingered under every opened breeze. Weller whispered that Thorne had hosted an auction, and two guests vanished before the storm hit without leaving any messages. A telegram sat unopened on his desk, addressed to Mara in unfamiliar handwriting, stamped with crimson wax from the future.
created_at
"2026-03-18T11:20:44.808Z"
3/18/2026, 11:20:44 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4162
moderation_latency
(null)
generation_time
4166
tokens_prompt
46
tokens_completion
201
native_tokens_prompt
41
native_tokens_completion
961
native_tokens_completion_images
0
native_tokens_reasoning
792
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
0.00120945
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_09b9980f54682d080169ba8a8ce46c81949ccafb0f63530c4d"
is_byok
false
latency
105
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-1773832844-RvZoFHj3b7Bzbn0b30W0"
upstream_id
"resp_09b9980f54682d080169ba8a8ce46c81949ccafb0f63530c4d"
total_cost
0.00120945
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