Run: 2026-02-20-01KHY98ZZRDZZSW2NJ4H4MYB5P

Run Details

Duration:
5.2s
Cost:
$0.000349
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
22.07% 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
Mist hung heavy over Blackwood Manor as guests arrived for the annual gala under a moonless, starless sky tonight. Lady Eleanor Blackwood, the elegant hostess, greeted each one warmly in the grand foyer lit by crystal chandeliers. Suddenly, a piercing scream echoed from the library, shattering the evening's sophisticated chatter and laughter abruptly. Guests rushed toward the ornate oak door, pushing it open to reveal a horrifying sight inside the room. Lord Reginald Blackwood lay sprawled on the Persian rug, a jeweled dagger plunged deep into his unmoving chest cavity. Blood pooled around his lifeless body, staining the antique carpet in a dark, crimson circle that spread slowly. Inspector Harlan Graves arrived swiftly, his trench coat dripping rain as he surveyed the gruesome scene methodically. No one had left the manor, trapping all suspects within these fog-enshrouded walls on this fateful night.
created_at"2026-02-20T19:43:52.838Z" 2/20/2026, 7:43:52 PM
model"x-ai/grok-4.1-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency246
moderation_latency(null)
generation_time5055
tokens_prompt46
tokens_completion288
native_tokens_prompt191
native_tokens_completion666
native_tokens_completion_images0
native_tokens_reasoning480
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"
usage0.00034855
router(null)
provider_responses
0
endpoint_id"9821aa0e-dce3-4c27-9716-161359123d0b"
id"7b2f5a03-1aa0-c7f7-8e66-03e64cced371"
is_byokfalse
latency126
model_permaslug"x-ai/grok-4.1-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771616632-SQOwdNx5QlmurpVG3wuN"
upstream_id"7b2f5a03-1aa0-c7f7-8e66-03e64cced371"
total_cost0.00034855
cache_discount0.00002265
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
22.07% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
019
118
216
318
419
518
617
718