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Run: 2026-03-18-01KM08PCKENTEXTERPMK032PN9
Run Details
Model:
GPT-5.4 Nano (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
3.3s
Cost:
$0.000844
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 etched silver paths on Hawthorne Manor, where guests gathered for midnight supper after the séance ended quietly tonight. Sir Lionel insisted the locked study be opened, insisting his late brother's violin case held vital clues for everyone present. When the butler produced a key, smoke curled from the hearth, though no fire burned at all in that room. A scream pierced the hall; Cassandra Vale fled the staircase clutching a pearl-handled dagger and trembling without any further explanation. Inside the study, Dr. Mercer lay facedown, ink spilled beside him, while the others watched the clock strike thirteen once.
created_at
"2026-03-18T10:43:35.674Z"
3/18/2026, 10:43:35 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3008
moderation_latency
(null)
generation_time
3245
tokens_prompt
46
tokens_completion
163
native_tokens_prompt
41
native_tokens_completion
669
native_tokens_completion_images
0
native_tokens_reasoning
538
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
0.00084445
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_094b548e1be149820169ba81d7bdc881978ad867843e57dccc"
is_byok
false
latency
215
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-1773830615-6rzVZfrB5nYvcZXAiRLG"
upstream_id
"resp_094b548e1be149820169ba81d7bdc881978ad867843e57dccc"
total_cost
0.00084445
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
5
wordCounts
0
20
1
20
2
20
3
20
4
20