Run: 2026-03-12-01KKHZH2SFGKD4F6Z80G59HDPX

Run Details

Model:
Grok 4.20 (Beta)
Test:
Data extraction
Scenario:
What instrument does Lucy play?
Duration:
765ms
Cost:
$0.000148
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
Fail Matches text (details)
Fail Matches Regex (details)
no eval Overall

Model input

User/Human
What instrument does Lucy play based on the following text? Only return the instrument, nothing else. In the school band, there are four instruments: drums, bass, flute, trumped. John plays the drums, Mary plays the flute, and Pete plays the trumpet. Lucy doesn't play a wind instrument.

Model response

AI
drums
created_at"2026-03-12T21:34:02.55Z" 3/12/2026, 9:34:02 PM
model"x-ai/grok-4.20-beta-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency737
moderation_latency(null)
generation_time737
tokens_prompt75
tokens_completion2
native_tokens_prompt183
native_tokens_completion2
native_tokens_completion_images0
native_tokens_reasoning0
native_tokens_cached128
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.0001476
router(null)
provider_responses
0
endpoint_id"33f49f24-a0de-4dcf-872d-ca514e83fbae"
id"9db9766b-353b-293e-5f2c-da30da629f1d"
is_byokfalse
latency706
model_permaslug"x-ai/grok-4.20-beta-20260309"
provider_name"xAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer(null)
api_type"completions"
id"gen-1773351242-8Q0gb2p8LkgpQfdLVg5M"
upstream_id"9db9766b-353b-293e-5f2c-da30da629f1d"
total_cost0.0001476
cache_discount0.0002304
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
Fail Matches text
Case insensitive: bass
 n/a
Fail Matches Regex
/\bbass\b/i
 n/a
no eval