Run: 2026-02-16-01KHK9G5F7Z8ST1581HA0YJNTG

Run Details

Duration:
26.1s
Cost:
$0.013571
Provider:
OpenAI

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 hammered the old station roof as Detective Mara Quinn stepped onto Platform Three, coat dripping, eyes already narrowing suspiciously. The overnight train from Norbridge waited shuddering, doors ajar, its windows glowing pale green against the bruised morning sky above. Somewhere along its twelve carriages, a conductor had found a man slumped alone in first class, unnaturally still and silent. Mara noted the clustered uniforms, their radios hissing nervously, passengers craning from doorways like gulls scenting blood on water below. She moved toward Carriage D, shoes squeaking on wet concrete, every step measured, building a rhythm against gathering whispers behind. Sergeant Lewis met her at the doorway, face grey, thumb worrying his notepad spiral until paper strands curled like shavings. He whispered that no one had entered or left the compartment since discovery, yet the window remained bolted from within. Inside, the carriage smelled of stale perfume and metal, and the dead man sat upright, smiling faintly at nothing nearby.
created_at"2026-02-16T13:16:35.477939+00:00" 2/16/2026, 1:16:35 PM
model"openai/gpt-5.1-20251113"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5775
moderation_latency(null)
generation_time25870
tokens_prompt46
tokens_completion1055
native_tokens_prompt41
native_tokens_completion1352
native_tokens_completion_images0
native_tokens_reasoning1129
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.01357125
router(null)
provider_responses
0
id"resp_070e559a5b3a29c7016993189925648197b019a17ecb038a94"
status200
is_byokfalse
latency145
endpoint_id"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name"OpenAI"
model_permaslug"openai/gpt-5.1-20251113"
api_type"completions"
id"gen-1771247769-b9iYOraAwPOAJjbSaD9G"
upstream_id"resp_070e559a5b3a29c7016993189925648197b019a17ecb038a94"
total_cost0.01357125
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.0000% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
120
220
320
420
520
620
720