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Run: 2026-04-24-01KQ0NWJAQB1N9Y3G3W15TQH6S
Run Details
Model:
GPT-5.5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
4.5s
Cost:
$0.003865
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
41.81%
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 silver lines across Blackthorn Hall’s windows as Inspector Vale arrived, finding the butler dead beneath the chandelier’s trembling crystals. The household gathered silently, each face pale with secrets, while the grandfather clock struck midnight thirteen times without explanation. On the marble floor, a crimson playing card rested near the body, bearing Lady Blackthorn’s missing sapphire brooch. Vale removed his gloves, studied the impossible scene, and noticed wet footprints leading upward toward the locked nursery door. Behind that door, a child’s music box began playing softly, though every servant swore the room stood empty.
created_at
"2026-04-24T21:21:15.104Z"
4/24/2026, 9:21:15 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
643
moderation_latency
(null)
generation_time
4399
tokens_prompt
46
tokens_completion
169
native_tokens_prompt
41
native_tokens_completion
122
native_tokens_completion_images
0
native_tokens_reasoning
0
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
0.003865
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_024ecb47a8abf4da0169ebdecb313c81938daaadbaded0f694"
is_byok
false
latency
261
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-1777065675-bV4evUUlPS80kg6orLe2"
session_id
(null)
api_type
"completions"
id
"gen-1777065675-4SMOCBuHdh4wV0rTBMUC"
upstream_id
"resp_024ecb47a8abf4da0169ebdecb313c81938daaadbaded0f694"
total_cost
0.003865
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
41.81%
Matches word count
n/a
neededClean
false
sentences
5
wordCounts
0
21
1
19
2
18
3
19
4
18