OpenAI has the better coding model anyways. You will be pleasantly surprised by Codex. The TUI tool is less buggy and runs faster and it's a more careful and less error-prone model. It's not as "creative" but it's more intelligent.

On top of that their $20 plan has much higher usage limits than Anthropic's $20 plan and they allow its use in e.g. opencode. So you can set up opencode to use both OpenAI's codex plan plus one of the more intelligent Chinese models so you can maximize your usage. Have it fully plan things out using GPT 5.4, write code using e.g. Qwen 3.6, then switch back to GPT 5.4 for review