Run: 2026-07-09-01KX414D18Z8J16TA6KTYBBM77

Run Details

Model:
GPT-5.6 Luna
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.4s
Cost:
$0.000647
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
46.93% 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

AI
Rain polished the cobblestones while Inspector Vale discovered a corpse beneath the clocktower, clutching a silver key stained unmistakably crimson. Nearby, every window watched silently, yet one curtain trembled whenever thunder rolled across the sleeping village that night. Vale knelt beside the body, recognizing the victim as Reverend Harrow, whose funeral sermon had threatened someone present nearby. A distant bell struck midnight, and from the locked tower above, footsteps descended slowly through darkness toward him.
created_at"2026-07-09T18:09:40.399Z" 7/9/2026, 6:09:40 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1005
moderation_latency(null)
generation_time1269
tokens_prompt46
tokens_completion136
native_tokens_prompt41
native_tokens_completion101
native_tokens_completion_images0
native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
service_tier"default"
usage0.000647
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_03ce278d1521325e016a4fe3e47c788190b068cacd95d445ef"
is_byokfalse
latency221
model_permaslug"openai/gpt-5.6-luna-20260709"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer(null)
request_id"req-1783620580-zHkpM8nkuwK61P050kZT"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783620580-8GbwrS7xDTl2wVdamH92"
upstream_id"resp_03ce278d1521325e016a4fe3e47c788190b068cacd95d445ef"
total_cost0.000647
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
46.93% Matches word count n/a
neededCleanfalse
sentences4
wordCounts
020
118
219
318