Run: 2026-02-20-01KHY8Y94C7MYN3WDKNCXYFGEB

Run Details

Model:
Grok 4 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
5.2s
Cost:
$0.000147
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
67.02% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Fog cloaked the silent harbor town. Moonlight glinted off the rippling waves. A scream pierced the misty night air. Body sprawled lifeless on the dock. Blood pooled beneath the wooden planks. Detective Harper stepped into the gloom. Shadows hid the killer's secret path.
created_at"2026-02-20T19:38:01.756Z" 2/20/2026, 7:38:01 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4614
moderation_latency(null)
generation_time5054
tokens_prompt46
tokens_completion75
native_tokens_prompt191
native_tokens_completion262
native_tokens_completion_images0
native_tokens_reasoning199
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"
usage0.00014655
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"814f2849-ab29-4c22-ac87-788cdcac5dc5"
is_byokfalse
latency2108
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771616281-JPukdobqN6Y8Bv8MIr9x"
upstream_id"814f2849-ab29-4c22-ac87-788cdcac5dc5"
total_cost0.00014655
cache_discount0.00002265
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
67.02% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
06
16
27
36
46
56
66