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Run: 2026-03-06-01KK1HMY7EM64XFP86EEKZ0061
Run Details
Model:
GPT-5.4 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
4.1s
Cost:
$0.002008
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
49.67%
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
At midnight, Blackthorn Manor held its breath while rain clawed the windows and every portrait watched the grand staircase silently. Lady Haversham descended in white silk, clutching a silver candlestick, her footsteps hushed by carpets older than anyone living. In the library, a clock struck twelve, and somewhere below, a door slammed hard enough to rattle decanters. When the scream came, it seemed torn from the house itself, sharp and sudden, then swallowed by thunder. They found Sir Alistair beside the hearth, eyes open, throat dark with blood, one hand gripping a missing button.
created_at
"2026-03-06T12:23:37.973Z"
3/6/2026, 12:23:37 PM
model
"openai/gpt-5.4-20260305"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
362
moderation_latency
(null)
generation_time
4022
tokens_prompt
46
tokens_completion
151
native_tokens_prompt
41
native_tokens_completion
127
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
0.0020075
router
(null)
provider_responses
0
endpoint_id
"9ff5625c-403f-4d7f-b895-58ac7295062c"
id
"resp_06b71c14aedbd1c70169aac74a07fc8197926e9399d110d0c4"
is_byok
false
latency
142
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-1772799817-ncb6UAJ4UGjEGE4FyUiv"
upstream_id
"resp_06b71c14aedbd1c70169aac74a07fc8197926e9399d110d0c4"
total_cost
0.0020075
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
49.67%
Matches word count
n/a
neededClean
false
sentences
5
wordCounts
0
20
1
19
2
18
3
18
4
19