Run: 2026-02-20-01KHY9GM8BN8TJ5RWVEC0TWZJP

Run Details

Duration:
13.5s
Cost:
$0.000819
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
85.24% 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
Thick dense fog enveloped the secluded old English manor house where wealthy industrialist Victor Langford hosted his annual gala tonight. Guests mingled happily in the opulent ballroom laughing and dancing to orchestra's lively tunes with champagne flutes in their hands. Suddenly a piercing scream echoed through the grand marble halls from the library where Victor had retired alone just before. Panicked guests rushed toward the awful sound pushing past ornate furniture and servants in the dimly lit corridor ahead. They burst into the library and froze at the horrific sight of Victor slumped over his desk in death. A jeweled dagger protruded from his back amid scattered papers and an overturned glass of cognac on the oak floor. Inspector Eliza Thorne arrived swiftly at the scene alerted by constable who had summoned her from nearby town station. Her sharp eyes scanned the room noting the French windows ajar and faint muddy footprints leading toward the garden outside.
created_at"2026-02-20T19:48:02.964Z" 2/20/2026, 7:48:02 PM
model"x-ai/grok-4.1-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency539
moderation_latency(null)
generation_time13363
tokens_prompt46
tokens_completion382
native_tokens_prompt191
native_tokens_completion1606
native_tokens_completion_images0
native_tokens_reasoning1429
native_tokens_cached151
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"
usage0.00081855
router(null)
provider_responses
0
endpoint_id"9821aa0e-dce3-4c27-9716-161359123d0b"
id"8b11cb56-74ec-6a78-00cc-07c78a91317a"
is_byokfalse
latency399
model_permaslug"x-ai/grok-4.1-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771616882-qZflZPLp2lcqJhh8n4CB"
upstream_id"8b11cb56-74ec-6a78-00cc-07c78a91317a"
total_cost0.00081855
cache_discount0.00002265
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
85.24% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
120
220
319
419
520
619
720