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Run: 2026-03-06-01KK1GFJE3K3KM962A7ZE19X78
Run Details
Model:
GPT-5.4 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
3.9s
Cost:
$0.001992
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
68.52%
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 hammered Blackthorn Hall as mourners gathered, umbrellas dripping like broken wings beneath gargoyles that watched the funeral with stone patience. Inside, candles guttered along the corridor, casting trembling halos over portraits whose lacquered eyes seemed unwilling to forgive anyone. When the clock struck midnight, Evelyn Harrow opened her father's study door and found his body arranged behind the desk. A chess king rested in his palm, crimson smeared across the ivory, while the window stood open to stormwinds. No one heard her scream above the thunder, yet every guest arrived breathless moments later, each carrying silence suspiciously.
created_at
"2026-03-06T12:03:13.482Z"
3/6/2026, 12:03:13 PM
model
"openai/gpt-5.4-20260305"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
480
moderation_latency
(null)
generation_time
3826
tokens_prompt
46
tokens_completion
167
native_tokens_prompt
41
native_tokens_completion
126
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
0.0019925
router
(null)
provider_responses
0
endpoint_id
"9ff5625c-403f-4d7f-b895-58ac7295062c"
id
"resp_09119a531b079bde0169aac28187ec8196a5f586aa7694a776"
is_byok
false
latency
146
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-1772798593-9y4p6c7ynXm10ik87fuz"
upstream_id
"resp_09119a531b079bde0169aac28187ec8196a5f586aa7694a776"
total_cost
0.0019925
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
68.52%
Matches word count
n/a
neededClean
false
sentences
5
wordCounts
0
21
1
19
2
20
3
19
4
19