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Run: 2026-09-23-01M36NTDP1E6QHQ7RD43KXTKRB
Run Details
Model:
GPT-6 Luna (Reasoning, Medium)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
16.9s
Cost:
$0.000858
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
100.00%
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, the observatory’s great clock stopped, though every witness swore its hands had continued moving beneath the storm outside. When Dr. Vale was found beneath the telescope, rainwater glittered on his coat, but his polished shoes remained bone dry. Inspector Mara Venn noticed the locked door, shattered window, and muddy footprint ending abruptly beside the desk, without any trail. Around them, six guests stood silent, each claiming to hear the dead astronomer speaking after his final breath that evening. Mara studied the youngest guest, whose clean, trembling hands concealed a silver key beneath one cuff of his velvet coat. Then the clock struck thirteen, and every guest turned toward the empty chair beside the corpse, all at once, silently.
created_at
"2026-09-23T08:23:53.29Z"
9/23/2026, 8:23:53 AM
model
"openai/gpt-6-luna-20260922"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
15906
moderation_latency
(null)
generation_time
16582
tokens_prompt
46
tokens_completion
195
native_tokens_prompt
41
native_tokens_completion
1707
native_tokens_completion_images
0
native_tokens_reasoning
1552
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
0.0008576
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer
(null)
request_id
"req-1790151833-0oHB6RDhg9agloePSzy4"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1790151833-bE1llnftLpXzUBdYNFkh"
upstream_id
"resp_04015cc3f0ba5ee6016ab38c996d0887d1aaca8fa2b776e366"
provider_responses
0
endpoint_id
"05e94e02-b9c2-4bbb-ba55-4082ee9ad687"
id
"resp_04015cc3f0ba5ee6016ab38c996d0887d1aaca8fa2b776e366"
is_byok
false
latency
684
model_permaslug
"openai/gpt-6-luna-20260922"
provider_name
"OpenAI"
status
200
total_cost
0.0008576
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
data_region
"global"
workspace_id
"97e315e5-d303-487d-83c1-83180e8a13d4"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20