Run: 2026-02-20-01KHY8FB8948BJ5H4N46AVA4K0

Run Details

Model:
Grok 4 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
4.0s
Cost:
$0.000153
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
52.53% 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 ancient mansion tonight. Guests gathered in the dimly lit hall. Chatter filled the air with false cheer. Host proposed a toast to old friends. Glass shattered as screams erupted suddenly. Body slumped in the velvet armchair. Blood stained the pristine white carpet. Whispers spread like wildfire through rooms. Detective entered with a knowing glance.
created_at"2026-02-20T19:29:52.407Z" 2/20/2026, 7:29:52 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3320
moderation_latency(null)
generation_time3923
tokens_prompt46
tokens_completion102
native_tokens_prompt191
native_tokens_completion286
native_tokens_completion_images0
native_tokens_reasoning209
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"
usage0.0001527
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"cbc3ac66-e3a2-a48b-33e4-222998569f8a"
is_byokfalse
latency1241
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771615792-RvYqlOf5rzAnXu9vwKwj"
upstream_id"cbc3ac66-e3a2-a48b-33e4-222998569f8a"
total_cost0.0001527
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
52.53% Matches word count n/a
neededCleanfalse
sentences9
wordCounts
06
17
27
37
46
56
66
76
86