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Run: 2026-03-09-01KK9QQ8M3QZD286KXBPFTNWV6
Run Details
Model:
GPT-5.4 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
28.4s
Cost:
$0.023848
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 worried the windows of Blackthorn Hall as Inspector Vale arrived, coat dripping, and found the front door standing open. Inside, the grandfather clock struck midnight, each note lingering like a warning over marble floors and rows of extinguished candles. A woman in emerald silk lay beneath the staircase, one gloved hand outstretched toward a shattered porcelain music box nearby. No blood showed in the dimness, yet her throat bore a narrow bruise, neat as a ribbon's shadow at dawn. On the banister rested a single white rose, wet with rain although every window overlooking the terrace remained latched tight. From somewhere deeper within, a man laughed once, softly, then stopped, as if remembering the house was listening to him. Vale removed his hat, studied the dead woman's ringless fingers, and understood that everyone awake tonight had already lied once.
created_at
"2026-03-09T16:43:41.069Z"
3/9/2026, 4:43:41 PM
model
"openai/gpt-5.4-20260305"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
25167
moderation_latency
(null)
generation_time
28353
tokens_prompt
46
tokens_completion
229
native_tokens_prompt
41
native_tokens_completion
1583
native_tokens_completion_images
0
native_tokens_reasoning
1405
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
0.0238475
router
(null)
provider_responses
0
endpoint_id
"9ff5625c-403f-4d7f-b895-58ac7295062c"
id
"resp_08babf7fa75ae9530169aef8bd29fc8197857c5822baa57488"
is_byok
false
latency
172
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-1773074621-hU1OzD8xJDJIcQBpGROb"
upstream_id
"resp_08babf7fa75ae9530169aef8bd29fc8197857c5822baa57488"
total_cost
0.0238475
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20