Run: 2026-05-01-01KQHSDMXH88NQ0P1Y2BY0HDPS

Run Details

Model:
Grok 4.20 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
31.8s
Cost:
$0.008254
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The wealthy industrialist invited several guests to his remote mansion for a weekend of mystery games and fine dining experiences. However none of the attendees could have predicted the horrifying event that would transform their gathering into a real tragedy. The host lay motionless on the floor with a dagger embedded in his chest and blood all around the body. The guests stood frozen in horror staring at the gruesome sight before them wondering who among them could be responsible.
created_at"2026-05-01T12:50:05.878Z" 5/1/2026, 12:50:05 PM
model"x-ai/grok-4.20-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency31251
moderation_latency(null)
generation_time31752
tokens_prompt46
tokens_completion654
native_tokens_prompt159
native_tokens_completion3276
native_tokens_completion_images(null)
native_tokens_reasoning3191
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"
usage0.00825435
router(null)
provider_responses
0
endpoint_id"3ecee37f-b217-4093-87fb-aaf0afe307af"
id"d62d8a3a-b1a3-de58-e493-551822742a78"
is_byokfalse
latency133
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-1777639805-TkXyIxkfb0N8nBDvLBkQ"
session_id(null)
api_type"completions"
id"gen-1777639805-qTvffIUvhT1V9eXq9Fyf"
upstream_id"d62d8a3a-b1a3-de58-e493-551822742a78"
total_cost0.00825435
cache_discount0.0001344
upstream_inference_cost0
provider_name"xAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences4
wordCounts
020
120
220
320