OpenCode – The open source AI coding agent

https://opencode.ai/

OpenCode | The open source AI coding agent

OpenCode - The open source coding agent.

If I wanted to switch from Claude Code to this - what openai model is comparable to opus 4.6? And is it the same speed or slower/faster? Thank you!
GPT 5.4 has been the winner this week. Last week Opus 4.6. You can use both in OpenCode.