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Run: 2026-03-09-01KK9PWWXMZS7E69CYNKTRNNP1
Run Details
Model:
GPT-5.4 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
14.4s
Cost:
$0.013992
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
Rain needled the manor windows as Detective Mara Voss arrived, summoned before dawn by a trembling call from the housekeeper. Inside, candlelight shivered along portraits whose stern eyes seemed newly awake, watching servants cluster silently around the grand staircase below. At the landing lay Edmund Wren, throat opened with surgical precision, one gloved hand pointing accusingly toward the library door. No blood marked the corridor beyond him, yet muddy footprints ended abruptly beside the banister, as though erased midstep there. Mara noticed the stopped clock above the hearth, its hands fixed at 4:17, and smelled faint lilacs beneath sharp cordite. Then the butler whispered that every guest had remained upstairs all night, which made the missing widow impossible to ignore.
created_at
"2026-03-09T16:29:17.117Z"
3/9/2026, 4:29:17 PM
model
"openai/gpt-5.4-20260305"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
13253
moderation_latency
(null)
generation_time
14266
tokens_prompt
46
tokens_completion
201
native_tokens_prompt
41
native_tokens_completion
926
native_tokens_completion_images
0
native_tokens_reasoning
767
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
0.0139925
router
(null)
provider_responses
0
endpoint_id
"9ff5625c-403f-4d7f-b895-58ac7295062c"
id
"resp_004a59dc2dfdc2340169aef55d2f98819496a8b59be01d9a44"
is_byok
false
latency
173
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-1773073757-qAYfAtNmfi0n0LzABgde"
upstream_id
"resp_004a59dc2dfdc2340169aef55d2f98819496a8b59be01d9a44"
total_cost
0.0139925
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