Run: 2026-07-09-01KX4055SM1Z96FXSBZZBBG8KW

Run Details

Model:
GPT-5.6 Luna
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.2s
Cost:
$0.000707
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
5.64% 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 courthouse windows while Detective Mara Voss discovered Judge Bellamy’s corpse beneath the locked witness stand. A silver courtroom key rested between his fingers, gleaming like a promise none of us understood yet. Mara touched the door, found fresh mud beneath it, and heard someone breathing softly beyond the empty gallery. The courthouse clock struck midnight, though every witness swore the mechanism had stopped yesterday afternoon. Then my phone rang, displaying Mara’s number, while Mara stood beside me, pale and utterly silent.
created_at"2026-07-09T17:52:37.185Z" 7/9/2026, 5:52:37 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency354
moderation_latency(null)
generation_time1090
tokens_prompt46
tokens_completion146
native_tokens_prompt41
native_tokens_completion111
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"
usage0.000707
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_00ebdbdee6da0e78016a4fdfe540d48195a75ec1266d3922a8"
is_byokfalse
latency205
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-1783619557-DgLsbKOKjdAwtsjL2jln"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783619557-pcJNdVDGBYc65q3bJa6k"
upstream_id"resp_00ebdbdee6da0e78016a4fdfe540d48195a75ec1266d3922a8"
total_cost0.000707
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
5.64% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
018
117
218
315
416