Run: 2026-02-20-01KHY8E38Z11BRSB7KAFG308HD

Run Details

Duration:
5.3s
Cost:
$0.000278
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
0.13% 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
Fog shrouded the ancient mansion on the hill as thunder rumbled ominously in the distance that night. Guests arrived in luxury cars, their laughter echoing through the grand foyer filled with crystal chandeliers. Sir Reginald Blackwood greeted them warmly, his eyes hiding secrets beneath a charming, aristocratic smile. The dinner party began with fine wine flowing freely amid conversations of wealth and hidden rivalries. Suddenly, a piercing scream shattered the evening from the library down the dimly lit hallway. Servants rushed forward while guests froze in terror at the unexpected, horrifying interruption of festivities. Lady Eleanor burst from the library door, her face pale with blood staining her elegant gown. "Reginald is dead!" she cried out, pointing back inside where horror awaited the stunned assembly. Detective Harlan Graves arrived swiftly, his trench coat damp from rain as he assessed the scene. The body lay slumped over the desk, a poisoned chalice clutched tightly in the victim's hand.
created_at"2026-02-20T19:29:11.469Z" 2/20/2026, 7:29:11 PM
model"x-ai/grok-4.1-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1419
moderation_latency(null)
generation_time5231
tokens_prompt46
tokens_completion320
native_tokens_prompt191
native_tokens_completion524
native_tokens_completion_images0
native_tokens_reasoning336
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"
usage0.00027755
router(null)
provider_responses
0
endpoint_id"9821aa0e-dce3-4c27-9716-161359123d0b"
id"49fc6a90-2c56-5a3a-43e8-d766ee630a40"
is_byokfalse
latency1211
model_permaslug"x-ai/grok-4.1-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771615751-pd5H22dww92mNEonoaBI"
upstream_id"49fc6a90-2c56-5a3a-43e8-d766ee630a40"
total_cost0.00027755
cache_discount0.00002265
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
0.13% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
017
116
215
316
415
515
616
715
816
916