Run: 2026-02-20-01KHY8XAW5SH81FBFPZXH13H0W

Run Details

Duration:
37.4s
Cost:
$0.003504
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
90.16% 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
Shadows danced eerily on the walls of Blackwood Manor as thunder crashed and lightning illuminated the dark stormy night sky. Elegant Lord Harrington warmly greeted his ten invited guests in the grand foyer beneath the sparkling crystal chandelier above. Among those present were renowned Inspector Graves, the beautiful but scorned lover Elena, ruthless businessman Victor Slade, an enigmatic widow. The assembled guests conversed politely in the drawing room while sipping fine brandy amid flickering candlelight and the dancing shadows. The group raced up the grand staircase following the blood-curdling scream that had come from Lady Harrington's upstairs private suite. They burst into her bedroom to discover her body sprawled lifeless on the floor in her own pool of blood. Her throat bore a deep gash from a jeweled dagger now lying beside her on the rich bloodstained carpet below. Guests stared in shock at the locked door to her bedroom, with no visible key and no escape route available.
created_at"2026-02-20T19:37:30.768Z" 2/20/2026, 7:37:30 PM
model"x-ai/grok-4.1-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency227
moderation_latency(null)
generation_time37192
tokens_prompt46
tokens_completion939
native_tokens_prompt191
native_tokens_completion6989
native_tokens_completion_images0
native_tokens_reasoning6795
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"
usage0.0035042
router(null)
provider_responses
0
endpoint_id"9821aa0e-dce3-4c27-9716-161359123d0b"
id"47c1603b-bcf0-2031-e45c-0b33efa99890"
is_byokfalse
latency76
model_permaslug"x-ai/grok-4.1-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771616250-xUYoOKKQhJSHY8IpJPsi"
upstream_id"47c1603b-bcf0-2031-e45c-0b33efa99890"
total_cost0.0035042
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
90.16% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
119
220
320
421
520
620
720