Run: 2026-02-20-01KHY9PPYM4A0FZVK74QXRJZDH

Run Details

Duration:
2.1s
Cost:
$0.000228
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
16.42% 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
The fog clung to the cobblestone streets like a shroud on that moonless autumn night in Victorian London. Inspector Hargrove stepped from his carriage, his boots splashing in puddles that mirrored gaslight flames flickering nearby. He had been summoned urgently by a frantic telegram from the reclusive widow at Elmwood Manor. The wrought-iron gates creaked open, revealing a path lined with skeletal trees whispering secrets in the wind. As he approached the grand oak door, a butler appeared, his face pale and etched with unspoken dread. "Inspector, the master of the house lies dead in the library, foul play is evident," the butler stammered quickly. Hargrove nodded gravely, pushing past into the dimly lit foyer where shadows danced like accusing specters. The air was thick with the scent of cigar smoke and something metallic, sharp, and disturbingly familiar. He entered the library, where bookshelves towered like silent witnesses to the unfolding tragedy within. There, slumped over his desk, was Lord Harrington, a crimson pool spreading from a fatal wound in his chest.
created_at"2026-02-20T19:51:22.334Z" 2/20/2026, 7:51:22 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1075
moderation_latency(null)
generation_time1939
tokens_prompt46
tokens_completion282
native_tokens_prompt191
native_tokens_completion437
native_tokens_completion_images0
native_tokens_reasoning215
native_tokens_cached190
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"
usage0.0002282
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"6acb43c3-eeaf-257e-94f1-59d5ad86a632"
is_byokfalse
latency101
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771617082-qrrX3w52uJ2cYt7L27YO"
upstream_id"6acb43c3-eeaf-257e-94f1-59d5ad86a632"
total_cost0.0002282
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
16.42% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
018
117
216
318
418
519
616
717
815
919