Run: 2026-02-20-01KHY815Y9XPYV2KK9HDA2JQAH

Run Details

Duration:
3.0s
Cost:
$0.000259
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
0.16% 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
The fog clung to the cobblestone streets of Victorian London like a shroud on All Hallows' Eve. Inspector Hargrove stepped from his hansom cab, his lantern cutting through the misty veil ahead. Gaslights flickered weakly along the alley, casting long shadows that danced with unseen threats nearby. A scream pierced the night from the old manor house, sharp and filled with raw terror. Hargrove quickened his pace, boots echoing against the damp stones as urgency gripped him tightly. He reached the wrought-iron gate, its creak announcing his arrival to the silent estate within. Pushing open the heavy oak door, he entered the dimly lit foyer where candles burned low. The air was thick with the scent of pipe smoke and something metallic, disturbingly familiar now. Footsteps hurried from the parlor, revealing the butler's pale face twisted in abject fear. "Sir, it's the master," the man gasped, leading Hargrove to the study's crimson-stained threshold. There, slumped in his leather armchair, lay Lord Ashford with a dagger plunged deep into his chest. Blood pooled on the Persian rug, staining it dark as the inspector surveyed the gruesome scene. Bookshelves loomed like silent witnesses, their volumes undisturbed except for one fallen volume nearby. No signs of forced entry appeared, suggesting the killer was someone trusted in this household. Hargrove's mind raced with questions as the first clues began to weave their tangled web.
created_at"2026-02-20T19:22:08.21Z" 2/20/2026, 7:22:08 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1141
moderation_latency(null)
generation_time2790
tokens_prompt46
tokens_completion379
native_tokens_prompt191
native_tokens_completion499
native_tokens_completion_images0
native_tokens_reasoning200
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"
usage0.0002592
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"43bbf833-acdc-9c0d-23e6-8d953a107e54"
is_byokfalse
latency83
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771615328-knCwYlfH3trtfSiivQZp"
upstream_id"43bbf833-acdc-9c0d-23e6-8d953a107e54"
total_cost0.0002592
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
0.16% Matches word count n/a
neededCleanfalse
sentences15
wordCounts
017
115
215
316
415
516
616
716
814
915
1017
1116
1214
1315
1415