Run: 2026-05-01-01KQHR9BAYYZMXGSXC2GXG9W66

Run Details

Duration:
14.9s
Cost:
$0.006649
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
82.71% 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 ancient and mysterious mansion stood silently on the hilltop overlooking the dark and misty valley far below that night. The distinguished guests arrived one by one for the exclusive gathering hosted by the wealthy eccentric owner of the property. Amidst the laughter and conversation a sudden piercing scream echoed through the long halls causing everyone to freeze in fear. Upon investigation they discovered the host lying dead in a pool of blood with a knife in his back mysteriously. The inspector examined every detail carefully while questioning all the suspects about their exact whereabouts earlier that evening.
created_at"2026-05-01T12:30:16.419Z" 5/1/2026, 12:30:16 PM
model"x-ai/grok-4.20-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency14425
moderation_latency(null)
generation_time14529
tokens_prompt46
tokens_completion672
native_tokens_prompt159
native_tokens_completion2607
native_tokens_completion_images(null)
native_tokens_reasoning2501
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"
usage0.00664905
router(null)
provider_responses
0
endpoint_id"3ecee37f-b217-4093-87fb-aaf0afe307af"
id"d2004087-855b-7d6e-b7ea-be6c99cc6f9d"
is_byokfalse
latency70
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-1777638616-HBGEwntLc5wYgsn4ZiEh"
session_id(null)
api_type"completions"
id"gen-1777638616-Bf6XFOMQzVJMi6Zn6ZkY"
upstream_id"d2004087-855b-7d6e-b7ea-be6c99cc6f9d"
total_cost0.00664905
cache_discount0.0000672
upstream_inference_cost0
provider_name"xAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
82.71% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
020
120
220
320
418