Run: 2026-02-20-01KHY9EZW174R0BFK08SWZQ843

Run Details

Model:
Grok 4.1 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
7.8s
Cost:
$0.000313
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. Lightning split the stormy midnight sky. A piercing scream shattered the silence. Guests froze in the candlelit parlor. Butler dashed up creaking wooden stairs. Lady Victoria slumped dead in hallway. Blood stained her elegant silk gown. Inspector Black arrived as dawn broke.
created_at"2026-02-20T19:47:09.324Z" 2/20/2026, 7:47:09 PM
model"x-ai/grok-4.1-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency359
moderation_latency(null)
generation_time7730
tokens_prompt46
tokens_completion137
native_tokens_prompt191
native_tokens_completion606
native_tokens_completion_images0
native_tokens_reasoning540
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"
usage0.0003127
router(null)
provider_responses
0
endpoint_id"9821aa0e-dce3-4c27-9716-161359123d0b"
id"dd1a3499-94fa-bb33-c74f-7668a55d0f7f"
is_byokfalse
latency119
model_permaslug"x-ai/grok-4.1-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771616829-s3jJa94SdYA8IHtZ12ou"
upstream_id"dd1a3499-94fa-bb33-c74f-7668a55d0f7f"
total_cost0.0003127
cache_discount0.0000285
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
77.88% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
06
16
26
36
46
56
66
76