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Run: 2026-04-24-01KQ0N12JXMRXZ3BQMWTN64YSK
Run Details
Model:
GPT-5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
11.8s
Cost:
$0.022825
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 polished the manor windows when Inspector Vale discovered blood. It pooled beneath Lord Ashcroft's portrait, black under trembling lamplight. The victim sat upright, smiling faintly despite the silver knife. Around him, seven guests pretended shock with rehearsed care tonight. Thunder covered the ticking clock and someone's strangled breath nearby. Vale noticed muddy footprints crossing carpets, leading mysteriously from nowhere. A shattered glass glittered beside a sealed, untouched crimson envelope. Before Vale spoke, the lights died, and someone laughed softly.
created_at
"2026-04-24T21:06:14.251Z"
4/24/2026, 9:06:14 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
11118
moderation_latency
(null)
generation_time
11681
tokens_prompt
46
tokens_completion
415
native_tokens_prompt
41
native_tokens_completion
754
native_tokens_completion_images
0
native_tokens_reasoning
643
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
0.022825
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_0742e9d96e5302060169ebdb46540c81908705eb7c59b48a70"
is_byok
false
latency
235
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-1777064774-rU5rE1OQx3trMPcWtyBO"
session_id
(null)
api_type
"completions"
id
"gen-1777064774-PlLXBYssX04gQEtOgkmM"
upstream_id
"resp_0742e9d96e5302060169ebdb46540c81908705eb7c59b48a70"
total_cost
0.022825
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
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10