Available since few weeks ago.

> Claude Opus 4.5, our frontier coding model, is now available in Claude Code for Pro users. Pro users can select Opus 4.5 using the /model command in their terminal.

Opus 4.5 will consume rate limits faster than Sonnet 4.5. We recommend using Opus for your most complex tasks and using Sonnet for simpler tasks.

Use Claude Opus in Antigravity. Google is very generous with the limits. The best part is, if you hit your limit, you can switch to Gemini Pro High.

I think Google is able to do this because they host Claude on their own TPUs in their datacentres (probably for Vertex AI customers). So they can undercut just about anyone include Anthropic on costs!

No matter which model you start with, having the other frontier model as a backup is fantastic. Essentially you’re getting 2x the limit.

It is now. But the limit on $20 plan is quite low and easy to use up.