Best Way to Get Anthropic API Key

I’m thinking of signing up for a Github Copilot Pro just to have an access to Claude 3.5 Sonnet for personal use only. Will I be able to use their endpoint for the sample codes in the course? Or is there a better provider that offers a better deal: pricing and rate limit?

Currently, I’m using Gemini and love the free access and high rate limit.

I have a familiar question: Can we use another model for these objects?