Run: 2026-05-01-01KQHSBBYERCMZT7PC8ANSW1JC

Run Details

Model:
Grok 4.20
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
1.9s
Cost:
$0.000289
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
83.80% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The detective entered the dimly lit mansion with cautious steps. Blood stained the antique carpet in a perfect circle pattern. Servants whispered secrets behind the heavy oak library doors. Lightning revealed a hidden figure watching from the shadows. The victim clutched a torn letter with trembling cold fingers. Thunder echoed loudly as clocks struck exactly midnight hour. Everyone gathered silently around the body in frozen horror. A single silver key lay beside the open window.
created_at"2026-05-01T12:48:51.155Z" 5/1/2026, 12:48:51 PM
model"x-ai/grok-4.20-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency351
moderation_latency(null)
generation_time1800
tokens_prompt46
tokens_completion130
native_tokens_prompt157
native_tokens_completion91
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached128
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.00028935
router(null)
provider_responses
0
endpoint_id"3ecee37f-b217-4093-87fb-aaf0afe307af"
id"426bb2f5-479a-90c3-92ab-d44dc6bde9bd"
is_byokfalse
latency76
model_permaslug"x-ai/grok-4.20-20260309"
provider_name"xAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777639731-MwB5jMPCGc0CrJz2qHJp"
session_id(null)
api_type"completions"
id"gen-1777639731-0GCCm1FL8tSCRG1uoc9F"
upstream_id"426bb2f5-479a-90c3-92ab-d44dc6bde9bd"
total_cost0.00028935
cache_discount0.0001344
upstream_inference_cost0
provider_name"xAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
83.80% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
010
110
29
39
410
59
69
79