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Run: 2026-07-09-01KX41EP5NVPT1E1YFHQ1GQ7TK
Run Details
Model:
GPT-5.6 Luna
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.4s
Cost:
$0.000803
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
57.54%
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 hammered Blackthorn Manor as Detective Mara Voss arrived, summoned by a bloodstained letter discovered beneath the victim’s pillow. Inside, the grandfather clock had stopped at midnight, while seven guests waited silently around the library’s locked doors. Lord Adrian Vale lay beneath the chandelier, clutching a silver key and wearing someone else’s wedding ring on his finger. Mara noticed fresh mud across the carpet, leading away from the corpse and disappearing beneath the curtains behind the bookcase. “None of you leaves,” she announced, before thunder cracked and every candle extinguished simultaneously throughout the ancient house.
created_at
"2026-07-09T18:15:17.438Z"
7/9/2026, 6:15:17 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
380
moderation_latency
(null)
generation_time
1050
tokens_prompt
46
tokens_completion
171
native_tokens_prompt
41
native_tokens_completion
127
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"
service_tier
"default"
usage
0.000803
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_0e20f92a66b8696e016a4fe535846c8190aaeec70ce6f1b37f"
is_byok
false
latency
219
model_permaslug
"openai/gpt-5.6-luna-20260709"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer
(null)
request_id
"req-1783620917-xOsbXbbXRJHIj9iFffFd"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783620917-ySQzHOIXIxKHnA8Wviif"
upstream_id
"resp_0e20f92a66b8696e016a4fe535846c8190aaeec70ce6f1b37f"
total_cost
0.000803
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
data_region
"global"
Evaluation details
Result
Evaluator
Details
Meta Data
57.54%
Matches word count
n/a
neededClean
false
sentences
5
wordCounts
0
19
1
18
2
20
3
20
4
18