Run: 2026-02-20-01KHY7TZ3ZDQKB2WA08B1TH76Z

Run Details

Duration:
3.7s
Cost:
$0.000284
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
8.31% 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 hammered relentlessly against the fog-shrouded windows of Blackwood Manor on that fateful autumn evening. Detective Elias Thorne arrived just as lightning illuminated the sprawling estate's gothic silhouette against the stormy sky. He stepped from his car, umbrella futile against the wind-whipped downpour soaking his trench coat instantly. The butler, pale and trembling, greeted him at the creaking oak door with a whispered urgent plea for help. Inside the grand foyer, crystal chandeliers cast flickering shadows on portraits of stern ancestors lining the walls. Thorne followed the servant up the winding staircase, his footsteps echoing like ominous drumbeats in the silence. At the bedroom door, a metallic tang of blood hung heavy in the air, turning his stomach slightly. Pushing it open, he beheld Lady Victoria Harrington sprawled lifeless on the Persian rug by the fireplace. Her emerald gown was torn and stained crimson, throat slashed in a brutal, precise arc of violence. No weapon lay nearby, only shattered vase fragments and a single pearl earring glinting in the lamplight.
created_at"2026-02-20T19:18:44.619Z" 2/20/2026, 7:18:44 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2020
moderation_latency(null)
generation_time3156
tokens_prompt46
tokens_completion287
native_tokens_prompt191
native_tokens_completion537
native_tokens_completion_images0
native_tokens_reasoning316
native_tokens_cached152
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"
usage0.0002839
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"8ddd4e9f-6eec-fd10-45dc-80b5e7e4f929"
is_byokfalse
latency248
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771615124-KGh3EIa4fg9lWRC5tIPP"
upstream_id"8ddd4e9f-6eec-fd10-45dc-80b5e7e4f929"
total_cost0.0002839
cache_discount0.0000228
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
8.31% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
017
117
217
319
417
517
618
717
817
917