Run: 2026-07-09-01KX40KDP8GN94AWVA22DB7039

Run Details

Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
6.1s
Cost:
$0.003473
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 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. Everyone waited inside the library. Lord Ashcombe lay beneath portraits. His silver watch had stopped. The clock showed eleven seventeen. Nobody admitted hearing anything unusual. Yet mud covered every carpet. Vale examined the locked window. Fresh fingerprints circled its latch. Then someone screamed upstairs suddenly. All faces turned toward Marianne. She held Ashcombe’s missing key. Vale smiled without offering explanation.
created_at"2026-07-09T18:00:24.216Z" 7/9/2026, 6:00:24 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2226
moderation_latency(null)
generation_time5719
tokens_prompt46
tokens_completion496
native_tokens_prompt41
native_tokens_completion572
native_tokens_completion_images0
native_tokens_reasoning464
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"
usage0.003473
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_0870dcb446dc80af016a4fe1b8564c8197b5f91ece8622291f"
is_byokfalse
latency306
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-1783620024-zfeSNXzmeltHuqJRvUgZ"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783620024-XqLe5xn9zPmRK9a6VGEe"
upstream_id"resp_0870dcb446dc80af016a4fe1b8564c8197b5f91ece8622291f"
total_cost0.003473
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences14
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135