Run: 2026-07-09-01KX40YY9ZBCAP8M22KYSWDVYE

Run Details

Model:
GPT-5.6 Luna
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
1.4s
Cost:
$0.000665
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
90.52% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain tapped against Blackwood Manor. Inspector Vale arrived before midnight. The front door stood ajar. Inside, candlelight trembled across portraits. Someone had overturned the grandfather clock. A crimson footprint marked the carpet. Vale followed it toward darkness. The library door breathed softly. He pushed it open slowly. Lord Ashcombe lay beside writing desk. His throat displayed a narrow wound. Beside him, one teacup remained steaming. Vale heard footsteps above him. Then silence swallowed the house whole.
created_at"2026-07-09T18:06:41.479Z" 7/9/2026, 6:06:41 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency560
moderation_latency(null)
generation_time1292
tokens_prompt46
tokens_completion153
native_tokens_prompt41
native_tokens_completion104
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"
usage0.000665
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_0e17bce6c380521e016a4fe3318f5c8195affe3959771c39d3"
is_byokfalse
latency214
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-1783620401-g8H5GdhDzhpN3lbmx0xk"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783620401-oNkaKAOwHc42KsCse9WJ"
upstream_id"resp_0e17bce6c380521e016a4fe3318f5c8195affe3959771c39d3"
total_cost0.000665
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
90.52% Matches word count n/a
neededCleanfalse
sentences14
wordCounts
05
15
25
35
46
56
65
75
85
96
106
116
125
136