Run: 2026-02-20-01KHY944XE1DR4MQVCCYJSD9TS

Run Details

Duration:
3.7s
Cost:
$0.000264
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
0.57% 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 thickly to the ancient cobblestone streets of Victorian London on that fateful autumn night. A single gas lamp flickered weakly outside the grand home of wealthy industrialist Sir Reginald Thorne. Inside the opulent drawing room, crystal glasses and fine cigars lay scattered across the polished oak table. Sir Reginald's loyal butler, Mr. Hargrove, discovered his master's lifeless body slumped in the velvet armchair. A pool of crimson blood spread slowly from a single stab wound piercing the old man's chest. The room's heavy curtains were drawn tight, blocking out the silvery glow of the full moon outside. No signs of forced entry marred the solid oak doors or the tall sash windows nearby. Footsteps echoed faintly in the upstairs hallway as family members stirred from their uneasy slumber. Detective Inspector Eliza Hawthorne arrived swiftly, her keen eyes scanning the scene for hidden clues. The air hung heavy with the metallic tang of blood mixed with expensive pipe tobacco's faint aroma.
created_at"2026-02-20T19:41:14.039Z" 2/20/2026, 7:41:14 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2091
moderation_latency(null)
generation_time3550
tokens_prompt46
tokens_completion266
native_tokens_prompt191
native_tokens_completion502
native_tokens_completion_images0
native_tokens_reasoning304
native_tokens_cached166
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"
usage0.0002643
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"1d0a13d8-1857-86ae-c5b0-73f29fdf72ea"
is_byokfalse
latency78
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771616474-QvIQ8h9UXdPITC5gj39a"
upstream_id"1d0a13d8-1857-86ae-c5b0-73f29fdf72ea"
total_cost0.0002643
cache_discount0.0000249
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
0.57% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
017
116
217
316
417
517
616
715
815
917