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Run: 2026-04-24-01KQ0PP5G5R76FFW30Y72PTNCG
Run Details
Model:
GPT-5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
12.0s
Cost:
$0.019975
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 Blackthorn Manor's windows before midnight. Inside, twelve guests applauded, unaware the pianist had stopped breathing. Her final chord shivered beneath the chandelier's trembling crystal teeth. Lord Vane raised his glass, then noticed the spreading darkness. A crimson ribbon unfurled from beneath Clara's white satin bodice. Someone screamed, and the storm swallowed most of the sound. Inspector Hale, dining incognito, set down his untouched soup slowly. He counted doors, faces, exits, lies already blooming everywhere tonight. The grandfather clock struck twelve, though its hands showed eleven. On Clara's wrist, a freshly inked raven glistened wetly tonight.
created_at
"2026-04-24T21:35:13.931Z"
4/24/2026, 9:35:13 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
11434
moderation_latency
(null)
generation_time
11813
tokens_prompt
46
tokens_completion
497
native_tokens_prompt
41
native_tokens_completion
659
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
0.019975
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_0343626acbc475e30169ebe211ff3881949cef198f07af44bb"
is_byok
false
latency
420
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-1777066513-xCo5OA4d0KJS01fbagxm"
session_id
(null)
api_type
"completions"
id
"gen-1777066513-QYDxql5byLtEUEFBcUBl"
upstream_id
"resp_0343626acbc475e30169ebe211ff3881949cef198f07af44bb"
total_cost
0.019975
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