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Run: 2026-07-09-01KX40CN1RY80728NKXRE90CX7
Run Details
Model:
GPT-5.6 Luna
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
2.1s
Cost:
$0.000785
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
49.67%
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 polished the courthouse windows while Detective Mara Voss discovered Judge Bellwether's body beneath the chandelier, clutching a blue button. Everyone gathered inside insisted the locked courtroom had remained empty, though muddy footprints crossed the aisle toward the judge's vacant bench. Mara noticed eight witnesses watching her carefully, each wearing identical blue buttons sewn beneath their collars, like concealed evidence. Then the courthouse clock struck midnight, and Judge Bellwether's dead hand slowly pointed toward the youngest witness present. Nobody spoke until the lights vanished, leaving Mara alone with the corpse, eight suspects, and footsteps circling overhead.
created_at
"2026-07-09T17:56:42.176Z"
7/9/2026, 5:56:42 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
378
moderation_latency
(null)
generation_time
2049
tokens_prompt
46
tokens_completion
180
native_tokens_prompt
41
native_tokens_completion
124
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
0.000785
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_028a52b186ab7100016a4fe0da3f908194b1e01cbfb2fc6eef"
is_byok
false
latency
249
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-1783619802-yYpBrKvHaG7qxCl5sLc0"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783619802-mKBPBLFfhdB0PS9ollmO"
upstream_id
"resp_028a52b186ab7100016a4fe0da3f908194b1e01cbfb2fc6eef"
total_cost
0.000785
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
49.67%
Matches word count
n/a
neededClean
false
sentences
5
wordCounts
0
20
1
21
2
19
3
18
4
18