Run: 2026-02-20-01KHY7VDZTR2EXW5F0J7F1Y1A4

Run Details

Model:
Grok 4 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
1.7s
Cost:
$0.000154
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
77.88% 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
Rain fell hard on cobblestone streets. A scream pierced the midnight silence. Detective Hale rushed to the alley. Body lay twisted in shadows deep. Blood pooled beneath the victim's head. Knife glinted coldly in moonlight glow. No witnesses stirred in nearby homes. Hale knelt to examine the scene. Strange symbols marked the brick wall. Who could commit such brutal crime?
created_at"2026-02-20T19:18:59.846Z" 2/20/2026, 7:18:59 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1116
moderation_latency(null)
generation_time1577
tokens_prompt46
tokens_completion105
native_tokens_prompt191
native_tokens_completion277
native_tokens_completion_images0
native_tokens_reasoning194
native_tokens_cached152
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"
usage0.0001539
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"3f2e2911-7a2a-87bb-9814-d3878049bb54"
is_byokfalse
latency155
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771615139-GYffwLrSBrJgbnty97pP"
upstream_id"3f2e2911-7a2a-87bb-9814-d3878049bb54"
total_cost0.0001539
cache_discount0.0000228
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
77.88% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
06
16
26
36
46
56
66
76
86
96