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Run: 2026-07-09-01KX40ZDD7FYR44P2X7813E609
Run Details
Model:
GPT-5.6 Luna
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.4s
Cost:
$0.000767
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
8.56%
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 corpse beneath the library’s grand clock, its hands stopped precisely at twelve. Rain lashed the windows while seven guests gathered silently, each concealing secrets behind expressions carefully schooled into innocence. Vale noticed a silver thread clutched tightly in the victim’s fingers, glimmering beneath the chandelier’s trembling light overhead. Nobody spoke until the clock chimed once, though its mechanism had remained broken for nearly three years. Then, from upstairs, someone screamed Vale’s name, and every suspect turned toward the staircase with identical terror.
created_at
"2026-07-09T18:06:56.942Z"
7/9/2026, 6:06:56 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
405
moderation_latency
(null)
generation_time
1237
tokens_prompt
46
tokens_completion
164
native_tokens_prompt
41
native_tokens_completion
121
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
0.000767
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_0dc7be8513228626016a4fe3410c408195976e2ad2a70cd349"
is_byok
false
latency
254
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-1783620416-7VLV6bWvpbGOh2fNjjIm"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783620416-zdgJ5qSXMKuzLaEUl94X"
upstream_id
"resp_0dc7be8513228626016a4fe3410c408195976e2ad2a70cd349"
total_cost
0.000767
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
8.56%
Matches word count
n/a
neededClean
false
sentences
5
wordCounts
0
18
1
18
2
18
3
17
4
17