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Run: 2026-04-24-01KQ0P9P72WQJTSY4EG189XN58
Run Details
Model:
GPT-5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
14.0s
Cost:
$0.019765
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain stitched silver threads across Blackwell Manor's windows after midnight. Detective Mara Vale arrived as the grandfather clock stopped suddenly. Inside, candles trembled, revealing muddy footprints along the marble floor. Lord Blackwell lay beneath the portrait, smiling strangely in death. A ruby-handled letter opener pinned his bloodied cravat to carpet. No one screamed; the household waited, listening to rain outside. Mara noticed wax dripped upward on the nearest sconce somehow. She also saw one dinner chair facing the wall alone. From upstairs, a nursery rhyme began in a man's voice. Mara closed the door, knowing the murderer remained inside nearby.
created_at
"2026-04-24T21:28:25.065Z"
4/24/2026, 9:28:25 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
11871
moderation_latency
(null)
generation_time
13868
tokens_prompt
46
tokens_completion
442
native_tokens_prompt
41
native_tokens_completion
652
native_tokens_completion_images
0
native_tokens_reasoning
516
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
usage
0.019765
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_00c387d3cf03cd1c0169ebe07923d48194bfe053b6c93d6064"
is_byok
false
latency
257
model_permaslug
"openai/gpt-5.5-20260423"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer
(null)
request_id
"req-1777066105-Tl0B2Yn9KBBuOcg2NmHv"
session_id
(null)
api_type
"completions"
id
"gen-1777066105-Q28X0MFBqRij3Hq3bJQA"
upstream_id
"resp_00c387d3cf03cd1c0169ebe07923d48194bfe053b6c93d6064"
total_cost
0.019765
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10