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Run: 2026-04-24-01KQ0MWKMN59PTPGHW6XDJRP9A
Run Details
Model:
GPT-5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
12.7s
Cost:
$0.019885
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 Blackmoor Manor's windows that midnight. Inside, the guests applauded while thunder swallowed the final toast. Then Lady Vale screamed, shattering crystal and every polite smile. Lord Ashcombe lay beneath the portrait, eyes open, throat bleeding. A bloodied chess knight rested inside his stiffening right hand. No one moved, except Inspector Crowe, quietly closing the doors. He counted twelve faces, each reflecting firelight, fear, and calculation. The clock struck one, though everyone remembered winding it earlier. Outside, wet footprints ended abruptly beside the locked conservatory door. Crowe smiled thinly, knowing murder had chosen a crowded room.
created_at
"2026-04-24T21:03:47.87Z"
4/24/2026, 9:03:47 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
11827
moderation_latency
(null)
generation_time
12353
tokens_prompt
46
tokens_completion
459
native_tokens_prompt
41
native_tokens_completion
656
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
0.019885
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_0fee20c67a74a4e00169ebdab3f78081978bd0c002f4027344"
is_byok
false
latency
250
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-1777064627-SkKNReC8iwZoqH6xiv3K"
session_id
(null)
api_type
"completions"
id
"gen-1777064627-4muQ5nCGQCbcgNyaYeDi"
upstream_id
"resp_0fee20c67a74a4e00169ebdab3f78081978bd0c002f4027344"
total_cost
0.019885
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