What’s the Experience Like on the Max Plan with Claude Code?

Hey everyone! I'm currently spending about $300-$400 a month on OpenRouter credits using version 3.7. I'm thinking about switching to the Max plan, especially the one with the 20x rate limit, to see how it goes with Claude Code. I'm curious about how the rate limits work with the Sonnet 4 and Opus 4 models. Are they sufficient for a coding session of 3-4 hours? I typically need 4-5 prompts for planning and then just navigate through the agent while checking for differences. Any insights would be really appreciated!