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Run: 2026-04-24-01KQ0Q1M1B2B8G4B3TH58RMWDF
Run Details
Model:
GPT-5.5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
6.1s
Cost:
$0.003595
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
79.84%
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 combed the windows as Inspector Vale entered Blackthorn Manor. Inside, the grandfather clock stuttered, then surrendered completely to silence. Lady Marrow lay beneath portraits, one gloved hand crimson. No one screamed, though twelve guests watched from shadows. On the table, a teacup steamed beside her untouched. Vale noticed the sugar bowl contained pearls, not sugar. Outside, carriage wheels faded toward the moor's rising fog. He closed the door and counted every frightened face. One place at dinner remained set for nobody living.
created_at
"2026-04-24T21:41:29.272Z"
4/24/2026, 9:41:29 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2737
moderation_latency
(null)
generation_time
5959
tokens_prompt
46
tokens_completion
143
native_tokens_prompt
41
native_tokens_completion
113
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)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
usage
0.003595
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_0648d192cc4dabc80169ebe3897e1481978cfd037b5bd8fb88"
is_byok
false
latency
2027
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-1777066889-LrkgJ2XtQ3KR7Ilk7oKl"
session_id
(null)
api_type
"completions"
id
"gen-1777066889-GWjrgEcKwH1nD77bYu3V"
upstream_id
"resp_0648d192cc4dabc80169ebe3897e1481978cfd037b5bd8fb88"
total_cost
0.003595
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
79.84%
Matches word count
n/a
neededClean
false
sentences
9
wordCounts
0
10
1
10
2
9
3
9
4
9
5
9
6
9
7
9
8
9