Run: 2026-05-01-01KQHSED63JBY1F7W8A6MY0Q84

Run Details

Model:
Grok 4.20
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
2.2s
Cost:
$0.000269
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
49.18% 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 caution. Blood stained the antique rug in a sprawling pattern. Guests whispered nervously near the grand marble staircase. Lightning flashed outside revealing hidden figures in shadows. A single silver dagger lay beside the lifeless victim. Silence enveloped the room like an oppressive heavy blanket. Everyone present seemed guilty under flickering candlelight. The clock struck midnight signaling impending revelations ahead.
created_at"2026-05-01T12:50:30.727Z" 5/1/2026, 12:50:30 PM
model"x-ai/grok-4.20-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency406
moderation_latency(null)
generation_time2101
tokens_prompt46
tokens_completion128
native_tokens_prompt157
native_tokens_completion83
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"
usage0.00026935
router(null)
provider_responses
0
endpoint_id"3ecee37f-b217-4093-87fb-aaf0afe307af"
id"9511dbbc-8aed-878d-073d-80ad7f391eb5"
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-1777639830-l5sRuhsIhoz5Nzh2iDS6"
session_id(null)
api_type"completions"
id"gen-1777639830-Bq3NxkgLETA8ojPGPCr4"
upstream_id"9511dbbc-8aed-878d-073d-80ad7f391eb5"
total_cost0.00026935
cache_discount0.0001344
upstream_inference_cost0
provider_name"xAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
49.18% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
09
19
28
38
49
59
67
78