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Run: 2026-04-24-01KQ0P3TJE6CE5KXB17VE19K9D
Run Details
Model:
GPT-5.5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
5.7s
Cost:
$0.004285
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
41.58%
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 worried the windows of Blackthorn Hall while Inspector Vale counted thirteen guests reflected in the dining room mirrors tonight. At midnight, the grandfather clock stopped, and Lady Marrow screamed from the library with astonishing theatrical precision for everyone. We found Lord Marrow beneath the atlas table, his white gloves soaked crimson, one finger pointing toward nothing. No one touched the body, except the wind, which entered through broken glass and fluttered accusation across his papers. Then the lights returned, revealing a silver chess knight clutched tightly in the dead man’s left hand. Someone whispered that dinner had hidden sharper knives, and every face suddenly remembered a private reason for silence.
created_at
"2026-04-24T21:25:12.92Z"
4/24/2026, 9:25:12 PM
model
"openai/gpt-5.5-20260423"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
830
moderation_latency
(null)
generation_time
5651
tokens_prompt
46
tokens_completion
193
native_tokens_prompt
41
native_tokens_completion
136
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
0.004285
router
(null)
provider_responses
0
endpoint_id
"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id
"resp_0877ec0e3b91473e0169ebdfb93c748195a35f70e4bf80a33b"
is_byok
false
latency
486
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-1777065912-dOmniXVLeJDwVCeUXKo1"
session_id
(null)
api_type
"completions"
id
"gen-1777065912-GTBUjcx9Mc6mxmLf3uo5"
upstream_id
"resp_0877ec0e3b91473e0169ebdfb93c748195a35f70e4bf80a33b"
total_cost
0.004285
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
41.58%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
20
1
19
2
18
3
19
4
17
5
18