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Run: 2026-04-24-01KQ0PHV1W16WWX0MY4XH33B3N
Run Details
Model:
GPT-5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
14.3s
Cost:
$0.029215
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain stitched the manor's windows as Inspector Vale arrived, finding every clock stopped at midnight and the butler silently bleeding. Lady Harrow stood beside the staircase, white gloves spotless, while her guests whispered accusations into cups of cooling tea nearby. On the parquet floor lay a silver cufflink, engraved with initials belonging to no one invited that evening at all. Vale noticed the library door ajar, and beyond it, Lord Harrow's portrait hanging crooked above fresh ashes on marble tiles. The dead man's hand clutched a torn theatre ticket, damp with rain and smelling faintly of bitter almonds and smoke. Somewhere upstairs, a floorboard groaned, though all twelve suspects swore they had remained together since dinner in the drawing room. Vale removed his hat, smiled politely, and asked whether anyone wished to confess before breakfast complicated matters for everyone present. No one answered, but the stopped clocks began ticking again, each second sounding like a careful footstep behind locked doors.
created_at
"2026-04-24T21:32:52.164Z"
4/24/2026, 9:32:52 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
12873
moderation_latency
(null)
generation_time
14019
tokens_prompt
46
tokens_completion
573
native_tokens_prompt
41
native_tokens_completion
967
native_tokens_completion_images
0
native_tokens_reasoning
765
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
0.029215
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_0ff5a39bf274ae710169ebe1843fe48193a9f0dde72bc35170"
is_byok
false
latency
310
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-1777066372-XqBsdzlQp8crKtOV7ifM"
session_id
(null)
api_type
"completions"
id
"gen-1777066372-Hw6CDLkTZx0Yy4mWsSF9"
upstream_id
"resp_0ff5a39bf274ae710169ebe1843fe48193a9f0dde72bc35170"
total_cost
0.029215
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20