Run: 2026-03-12-01KKHZE0MG2E9DJ1QJKFN71R6H

Run Details

Model:
Grok 4.20 (Beta, Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
9.1s
Cost:
$0.015604
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
100.00% 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 wealthy businessman lay dead on his luxurious study floor. Fresh blood stains covered the ornate rug near the body. The antique clock struck twelve during the violent raging storm. Detective Smith entered the mansion and observed the dead body. .
created_at"2026-03-12T21:32:22.037Z" 3/12/2026, 9:32:22 PM
model"x-ai/grok-4.20-beta-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency8979
moderation_latency(null)
generation_time9060
tokens_prompt46
tokens_completion64
native_tokens_prompt159
native_tokens_completion2586
native_tokens_completion_images0
native_tokens_reasoning2540
native_tokens_cached128
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"
usage0.0156036
router(null)
provider_responses
0
endpoint_id"33f49f24-a0de-4dcf-872d-ca514e83fbae"
id"e556f17c-8d81-decf-6458-75da98a58463"
is_byokfalse
latency282
model_permaslug"x-ai/grok-4.20-beta-20260309"
provider_name"xAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer(null)
api_type"completions"
id"gen-1773351142-1MI6YmenN5xAWqOPCBQe"
upstream_id"e556f17c-8d81-decf-6458-75da98a58463"
total_cost0.0156036
cache_discount0.0002304
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences4
wordCounts
010
110
210
310