Yes I switched from claude code to opencode with deepseek recently.
replyIt is basically indistinguishable from sonnet. At this point my own prompts, AGENTS.md, background docs and so on matter a great deal more than the differences between models.
And deepseek v4 flash (the sonnet comparable) costs 3% of what sonnet does.
Same here. I use codex for planning and deepseek v4 flash for implementation. Its worked really well so far.
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