Run: 2026-02-20-01KHY9Q2ZGEPTJZ7568TEVJSZR

Run Details

Model:
Grok 4 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
2.8s
Cost:
$0.000148
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
Fog cloaked the ancient manor house. Thunder rumbled as shadows lengthened slowly. Sir Reginald stumbled into his study. A scream pierced the stormy night. Lady Eleanor found him slumped over. Blood pooled beneath his lifeless form. The dagger gleamed with fresh crimson. Servants gathered in hushed fearful whispers. Inspector Hale arrived at dawn's light. Who wielded the fatal silver blade?
created_at"2026-02-20T19:51:34.657Z" 2/20/2026, 7:51:34 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1446
moderation_latency(null)
generation_time2688
tokens_prompt46
tokens_completion110
native_tokens_prompt191
native_tokens_completion276
native_tokens_completion_images0
native_tokens_reasoning190
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"
usage0.0001477
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"47a10fb0-f83e-bf77-4c82-231cc360d04c"
is_byokfalse
latency96
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771617094-zxbr3yYi1twkuP2ViA08"
upstream_id"47a10fb0-f83e-bf77-4c82-231cc360d04c"
total_cost0.0001477
cache_discount0.0000285
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