Run: 2026-05-01-01KQHT4Z77ZCV8XWQQ46X6R5Q2

Run Details

Model:
Grok 4.20
Test:
Data extraction
Scenario:
What instrument does Lucy play?
Duration:
487ms
Cost:
$0.000167
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"2026-05-01T13:02:50.092Z" 5/1/2026, 1:02:50 PM
model"x-ai/grok-4.20-20260309"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency413
moderation_latency(null)
generation_time453
tokens_prompt75
tokens_completion2
native_tokens_prompt183
native_tokens_completion2
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"
usage0.00016655
router(null)
provider_responses
0
endpoint_id"3ecee37f-b217-4093-87fb-aaf0afe307af"
id"db966ee1-4c84-9492-9de4-436e8b4791e8"
is_byokfalse
latency94
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-1777640570-DrSAdBszQNiygS9Goar8"
session_id(null)
api_type"completions"
id"gen-1777640570-4Xgscn6kb0r0dL9w4kXR"
upstream_id"db966ee1-4c84-9492-9de4-436e8b4791e8"
total_cost0.00016655
cache_discount0.0000672
upstream_inference_cost0
provider_name"xAI"
response_cache_source_id(null)

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