Run: 2026-02-20-01KHY8648JHVDN9W0GDXW8BYWY

Run Details

Duration:
4.5s
Cost:
$0.000480
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
35.85% 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 rain-slicked streets of Victorian London gleamed under flickering gas lamps as Inspector Elias Crowe hurried toward the crime scene. A muffled scream echoed from the fog-shrouded alley, drawing curious eyes from shadowed doorways and upper windows alike. Pushing past the gathering crowd of wide-eyed onlookers, Crowe flashed his badge to the waiting uniformed constable. The body lay sprawled on cobblestones, pale face twisted in eternal surprise, blood pooling around the lifeless form. Silver-handled dagger protruded from the victim's chest, glinting coldly as thunder rumbled overhead in the stormy night. Crowe knelt beside the corpse, gloved hands probing pockets for clues amid the damp chill of early morning. No identification marked the elegant waistcoat, only a monogrammed handkerchief stained with the same crimson hue as the stones. Footprints trailed away into darkness, muddied steps leading toward the river's distant, whispering rush through the mist. A lady's scream pierced the air again, this time from a nearby carriage, shattering the tense hush of witnesses. Crowe rose swiftly, revolver drawn, heart pounding as he scanned the alley for the killer's unseen shadow lurking near.
created_at"2026-02-20T19:24:50.337Z" 2/20/2026, 7:24:50 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3141
moderation_latency(null)
generation_time4218
tokens_prompt46
tokens_completion314
native_tokens_prompt191
native_tokens_completion940
native_tokens_completion_images0
native_tokens_reasoning696
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"
usage0.0004797
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"76a115e8-0dec-2e2c-14b9-79adc69c7a43"
is_byokfalse
latency583
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771615490-ZTkEJReTiuWiI8xeFMxT"
upstream_id"76a115e8-0dec-2e2c-14b9-79adc69c7a43"
total_cost0.0004797
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
35.85% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
021
119
218
318
418
518
619
717
819
919