Run: 2026-02-20-01KHY8V158TA19KVDPC9BRQ8WN

Run Details

Duration:
3.6s
Cost:
$0.000349
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
89.63% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The old mansion loomed dark under the stormy midnight sky. Detective Harlan arrived quickly with his sharp-eyed assistant close. They entered the foyer where silence hung heavy and thick. A scream echoed suddenly from the library down the hall. Rushing inside, they found the body slumped over desk. Blood stained the oak wood and scattered papers everywhere. The victim's eyes stared blankly at the flickering candle flame. No weapon lay nearby in the dimly lit room. Harlan noted the broken window and missing family heirloom. Who could have entered and committed this brutal midnight crime?
created_at"2026-02-20T19:36:15.287Z" 2/20/2026, 7:36:15 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2765
moderation_latency(null)
generation_time3389
tokens_prompt46
tokens_completion160
native_tokens_prompt191
native_tokens_completion678
native_tokens_completion_images0
native_tokens_reasoning557
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"
usage0.0003487
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"436b5535-588d-263c-5e0f-af4ce26063b7"
is_byokfalse
latency481
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771616175-u4vhyaChOcIIoBWbC9yN"
upstream_id"436b5535-588d-263c-5e0f-af4ce26063b7"
total_cost0.0003487
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
89.63% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
010
110
210
310
49
59
610
79
89
910