Run: 2026-02-20-01KHY9MHQ64NSHRT1MRFWNK9PG

Run Details

Model:
Grok 4 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
2.7s
Cost:
$0.000176
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 cloaked the ancient mansion grounds. A scream shattered the midnight silence. Guests rushed toward the library door. Inside, Sir Reginald slumped over desk. Blood pooled beneath his lifeless form. Knife gleamed on the Persian rug. Whispers spread among the shocked faces. Detective Harlan entered the dimly lit room. His sharp eyes scanned every detail. Who struck the fatal blow tonight?
created_at"2026-02-20T19:50:11.441Z" 2/20/2026, 7:50:11 PM
model"x-ai/grok-4-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1868
moderation_latency(null)
generation_time2571
tokens_prompt46
tokens_completion110
native_tokens_prompt191
native_tokens_completion333
native_tokens_completion_images0
native_tokens_reasoning248
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"
usage0.0001762
router(null)
provider_responses
0
endpoint_id"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id"13f3f2dc-0b55-6956-b67d-7159f2c42843"
is_byokfalse
latency113
model_permaslug"x-ai/grok-4-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771617011-JKELxjhQFwcpatRjoI8k"
upstream_id"13f3f2dc-0b55-6956-b67d-7159f2c42843"
total_cost0.0001762
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
70.28% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
06
16
26
36
46
56
66
77
86
96