Trying first LLM example in LiveBook fails

Anthropic is by default, you need to override your aliases:

config :jido_ai, :model_aliases,  
  fast: "openai:gpt-4o-mini",  
  reasoning: "openai:gpt-4o",  
  planning: "openai:gpt-4o",  
  capable: "openai:gpt-4o"