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Run: 2026-07-09-01KX40K0V2FQHNXTB268CZT7HB
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.5s
Cost:
$0.006575
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
94.38%
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
At midnight, Inspector Vale discovered a dead violinist beneath the opera house, clutching a crimson envelope freshly sealed with wax. Rain hammered the glass canopy overhead, while distant applause faded through corridors that should have been empty for hours by then. Vale noticed the victim's fingers were stained blue, matching the peculiar ink smeared across every page inside the crimson envelope. A single wet footprint led away from the body, disappearing beneath the locked door of the director's private office upstairs. The director, renowned for charming audiences, had vanished before the final curtain, leaving his silver cane beside the orchestra pit. When Vale opened the envelope, he found a list of four names, including his own, written there in invisible ink. Behind him, the theater doors creaked, and someone whispered, "You should never have returned," before the hallway lights went dark.
created_at
"2026-07-09T18:00:10.858Z"
7/9/2026, 6:00:10 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5808
moderation_latency
(null)
generation_time
6264
tokens_prompt
46
tokens_completion
239
native_tokens_prompt
41
native_tokens_completion
1089
native_tokens_completion_images
0
native_tokens_reasoning
913
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
0.006575
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_028b80d50359e195016a4fe1aaeffc8194886f5cb84ca98fc0"
is_byok
false
latency
206
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-1783620010-dJPa9yg9ruZehxK58dNU"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783620010-aryjNVNNVf7cjmJQysTl"
upstream_id
"resp_028b80d50359e195016a4fe1aaeffc8194886f5cb84ca98fc0"
total_cost
0.006575
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
94.38%
Matches word count
n/a
neededClean
false
sentences
7
wordCounts
0
20
1
21
2
20
3
20
4
20
5
20
6
20