Run: 2026-03-12-01KKHZNCVMJ4PQC704RT06N3AW

Run Details

Model:
Grok 4.20 (Beta, Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
6.6s
Cost:
$0.011026
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
In the dimly lit study the body lay motionless quietly. Servants whispered anxiously about the incident from earlier that evening. Police officers secured the entire area with yellow tape quickly. Detective Black examined the scene with great interest and focus. .
created_at"2026-03-12T21:36:23.93Z" 3/12/2026, 9:36:23 PM
model"x-ai/grok-4.20-beta-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency6383
moderation_latency(null)
generation_time6524
tokens_prompt46
tokens_completion67
native_tokens_prompt159
native_tokens_completion1823
native_tokens_completion_images0
native_tokens_reasoning1776
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"
usage0.0110256
router(null)
provider_responses
0
endpoint_id"33f49f24-a0de-4dcf-872d-ca514e83fbae"
id"cfbbe794-2c4c-2c58-02b6-88a2ad5f36f3"
is_byokfalse
latency377
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-1773351383-1zbXBE8jnkbB7ZiKDrpA"
upstream_id"cfbbe794-2c4c-2c58-02b6-88a2ad5f36f3"
total_cost0.0110256
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