Run: 2026-05-01-01KQHR160GCWPTRXDB5GCAPJXJ

Run Details

Model:
Grok 4.20 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
17.6s
Cost:
$0.005682
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 old mansion stood silently on the isolated hilltop as heavy rain poured down during the dark stormy night outside. Inside the grand library the host was found murdered with a valuable dagger still embedded deeply in his chest area. The loyal butler discovered the tragic scene and immediately called for the local police to investigate the horrible crime thoroughly. Everyone at the exclusive dinner party became a suspect in this mysterious murder case that shocked the entire community present.
created_at"2026-05-01T12:25:48.822Z" 5/1/2026, 12:25:48 PM
model"x-ai/grok-4.20-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency17079
moderation_latency(null)
generation_time17540
tokens_prompt46
tokens_completion551
native_tokens_prompt159
native_tokens_completion2220
native_tokens_completion_images(null)
native_tokens_reasoning2135
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"
usage0.00568155
router(null)
provider_responses
0
endpoint_id"3ecee37f-b217-4093-87fb-aaf0afe307af"
id"0615f643-8ca6-308a-cb26-90385f0ab623"
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-1777638348-zvKJOCoqsgbcJgNJGIWG"
session_id(null)
api_type"completions"
id"gen-1777638348-A8BPphuerFSoa2vLbTKc"
upstream_id"0615f643-8ca6-308a-cb26-90385f0ab623"
total_cost0.00568155
cache_discount0.0000672
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