Run: 2026-05-01-01KQHRQ1R21DX3V9F51M6TSE3P

Run Details

Model:
Grok 4.20 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
30.1s
Cost:
$0.008929
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 prominent politician lay dead in his luxurious study with valuable artifacts scattered around him on that dark stormy night. The devoted secretary entered the spacious study carrying confidential files and immediately discovered her employer lying dead on the floor. The experienced detective was immediately summoned to investigate the suspicious circumstances surrounding the unexpected death of the wealthy man there. Many questions remained unanswered as he searched for clues that might reveal who had killed the important figure so brutally.
created_at"2026-05-01T12:37:45.35Z" 5/1/2026, 12:37:45 PM
model"x-ai/grok-4.20-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency29561
moderation_latency(null)
generation_time30091
tokens_prompt46
tokens_completion927
native_tokens_prompt159
native_tokens_completion3546
native_tokens_completion_images(null)
native_tokens_reasoning3462
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"
usage0.00892935
router(null)
provider_responses
0
endpoint_id"3ecee37f-b217-4093-87fb-aaf0afe307af"
id"9136bfcd-f35b-92d5-a6a5-8a413db4145c"
is_byokfalse
latency97
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-1777639065-geYGmHkhKnkGi88hL4El"
session_id(null)
api_type"completions"
id"gen-1777639065-ExHaGRiMxJkKQQRCGveO"
upstream_id"9136bfcd-f35b-92d5-a6a5-8a413db4145c"
total_cost0.00892935
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