Run: 2026-02-20-01KHY9B5FY7XR0CRYSAB1SRZX4

Run Details

Duration:
5.0s
Cost:
$0.000327
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
7.76% 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
In the quiet village of Eldridge, the old mansion stood silently under the full moon's eerie glow, windows dark. Detective Harlan Graves pulled up to the wrought-iron gates precisely at midnight, his tires crunching on gravel. He stepped out into thick fog that swirled around ancient oaks, flashlight piercing the night's heavy veil. A servant rushed forward from the shadowed porch, face pale and twisted in obvious terror and despair. "Sir, it's the master of the house; he's been found dead in his locked study upstairs now." Graves nodded grimly and followed the trembling man inside, coat brushing against creaking wooden floors below. The air hung heavy with scent of aged books mixed with something metallic and sharply disturbing. Up the grand staircase they climbed, portraits of stern ancestors watching their every hurried footstep. At the study door, sealed tight with yellow tape, two officers stood guard in silent vigil. Graves examined the keyhole closely, noting scratches that suggested forced entry despite claims otherwise.
created_at"2026-02-20T19:45:04.01Z" 2/20/2026, 7:45:04 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2832
moderation_latency(null)
generation_time4908
tokens_prompt46
tokens_completion277
native_tokens_prompt191
native_tokens_completion635
native_tokens_completion_images0
native_tokens_reasoning437
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"
usage0.0003272
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"8b4051df-bce5-d4fa-a054-a3cded516486"
is_byokfalse
latency102
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771616704-awm7GkIEnMZtKOkZiZMd"
upstream_id"8b4051df-bce5-d4fa-a054-a3cded516486"
total_cost0.0003272
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
7.76% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
019
118
217
317
417
516
616
715
816
914