Run: 2026-05-01-01KQHS5ZRAZBEX6VDX42KENPR1

Run Details

Model:
Grok 4.20
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
2.3s
Cost:
$0.000387
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
47.19% 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 detective arrived at the old mansion under a stormy midnight sky filled with ominous thunder and lightning bolts everywhere. A single candle flickered weakly inside the grand library where the wealthy victim lay dead on an antique rug. Blood pooled slowly around the ornate dagger still embedded deeply within his motionless chest causing immediate alarm. All five suspicious heirs gathered nervously in the hallway whispering accusations while hiding their own dark secrets carefully. Rain pounded relentlessly against the tall windows creating an eerie atmosphere perfect for uncovering hidden motives and betrayals tonight.
created_at"2026-05-01T12:45:54.83Z" 5/1/2026, 12:45:54 PM
model"x-ai/grok-4.20-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency373
moderation_latency(null)
generation_time2291
tokens_prompt46
tokens_completion162
native_tokens_prompt157
native_tokens_completion103
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached64
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"
usage0.00038655
router(null)
provider_responses
0
endpoint_id"3ecee37f-b217-4093-87fb-aaf0afe307af"
id"80102070-f2c5-904e-9a34-04a5369a4152"
is_byokfalse
latency80
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-1777639554-MWwFUys7gUFr5Zop3rTr"
session_id(null)
api_type"completions"
id"gen-1777639554-dhAcsnLTNWEhRgSWqRGY"
upstream_id"80102070-f2c5-904e-9a34-04a5369a4152"
total_cost0.00038655
cache_discount0.0000672
upstream_inference_cost0
provider_name"xAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
47.19% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
020
119
217
318
419