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Run: 2026-03-06-01KK1H0T3M5AVXR33B0ZQF4W5E
Run Details
Model:
GPT-5.4 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
4.7s
Cost:
$0.002383
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
60.65%
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 lashed Blackthorn Manor as mourners gathered, their umbrellas trembling like nervous witnesses beneath the bruised evening sky tonight. Inside, silver candlesticks flickered across portraits whose painted eyes seemed strangely alert, as though anticipating scandal before dessert arrived. Lady Vale welcomed everyone with brittle charm, her smile precise and bloodless, while thunder rolled somewhere beyond the cliffs. Among the guests stood Dr. Harlow, discreetly watching the grandfather clock, whose pendulum marked each second like a warning. When the butler announced supper, a scream erupted upstairs, sharp enough to silence the storm and freeze every heartbeat. They found Sir Alistair sprawled within his locked study, a letter clenched tightly, and fresh mud staining Persian carpet.
created_at
"2026-03-06T12:12:38.396Z"
3/6/2026, 12:12:38 PM
model
"openai/gpt-5.4-20260305"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
393
moderation_latency
(null)
generation_time
4661
tokens_prompt
46
tokens_completion
204
native_tokens_prompt
41
native_tokens_completion
152
native_tokens_completion_images
0
native_tokens_reasoning
0
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
0.0023825
router
(null)
provider_responses
0
endpoint_id
"9ff5625c-403f-4d7f-b895-58ac7295062c"
id
"resp_0717ebf63135c7340169aac4b6783c81959e18fafda68e0386"
is_byok
false
latency
138
model_permaslug
"openai/gpt-5.4-20260305"
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-1772799158-Za2Cjce56ZiuSZnltiRp"
upstream_id
"resp_0717ebf63135c7340169aac4b6783c81959e18fafda68e0386"
total_cost
0.0023825
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
60.65%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
19
1
19
2
19
3
19
4
19
5
19