Run: 2026-02-20-01KHYATQ79V5XTVDGRA8YN0CKX

Run Details

Model:
Grok 4 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
2.6s
Cost:
$0.000173
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
70.28% 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 shrouded the old mansion gate. A scream echoed through the silent night. Guests hurried inside the grand ballroom. Crystal chandeliers cast eerie golden light. Host lay sprawled on marble floor. Blood pooled beneath his lifeless form. Whispers spread like wildfire among friends. Detective Jones examined the locked door. No weapon found near the body. Mystery hung heavy in the air.
created_at"2026-02-20T20:11:02.26Z" 2/20/2026, 8:11:02 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1820
moderation_latency(null)
generation_time2489
tokens_prompt46
tokens_completion108
native_tokens_prompt191
native_tokens_completion315
native_tokens_completion_images0
native_tokens_reasoning229
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"
usage0.00017305
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"7da0469e-73c6-012e-3710-7f18e422af04"
is_byokfalse
latency63
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771618262-R8YjAFJmNb4PCpX5iy26"
upstream_id"7da0469e-73c6-012e-3710-7f18e422af04"
total_cost0.00017305
cache_discount0.00002265
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
70.28% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
06
17
26
36
46
56
66
76
86
96