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Run: 2026-04-24-01KQ0N7693DJQ9K385D6FMGP23
Run Details
Model:
GPT-5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
13.1s
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 hammered Blackwood Manor as midnight swallowed the last carriage. The butler found Lady Vale beneath the chandelier, smiling bloodlessly. Her emerald necklace glittered beside one perfectly gloved, severed clue. Every clock in the house had stopped at twelve thirteen. Inspector Hargreaves arrived wearing mud, suspicion, and a black umbrella. Nobody admitted hearing screams, though thunder had conveniently rehearsed alibis. In the library, warm ashes hid a half burned photograph. Across its face, someone had written, She lied about everything. Then the dead woman coughed once, and everyone stepped back. Except her husband, whose shoes matched the mud outside exactly.
created_at
"2026-04-24T21:09:34.633Z"
4/24/2026, 9:09:34 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
12403
moderation_latency
(null)
generation_time
12756
tokens_prompt
46
tokens_completion
584
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_074787be3d9e315e0169ebdc0eb2d48197828a28de17319d95"
is_byok
false
latency
244
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-1777064974-MXC1Gm2bftuvuBsItIqN"
session_id
(null)
api_type
"completions"
id
"gen-1777064974-yC5HICnnDaSKwvwiN61r"
upstream_id
"resp_074787be3d9e315e0169ebdc0eb2d48197828a28de17319d95"
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