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There's some pretty interesting evidence that this feature actually just increased costs: https://stencil.so/blog/prewalk
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Wait, you can turn that back on? Where's the flag?
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The flag is:

    "showClearContextOnPlanAccept": true
Boris rationale was "with 1m context window, most users don't need it anymore."

https://x.com/bcherny/status/2035375125382451648

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This part I find a little disappointing. The plan is the perfect boundary to cut context which still isn’t free, even if models can handle a lot of it now.
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Remember, Anthropic knows best for your workflow!

/s

This is why open harnesses and open models will always be superior, it's only a matter of time until someone decides that something you use isn't worth maintaining anymore. The reply from the Anthropic employee up above doesn't give me much confidence that Claude users will be able to continue using plan mode forever.

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Codex and Claude Code are the best harnesses out there by a long shot. They work out of the box, require no real config, and just do the thing.

The flexibility and lightweight nature of open harnesses is mainly useful for open models. These models are considerably far behind the frontier and need a lot more steering. Complex harnesses confuse them. I use open harnesses for my OSS model rig because the model needs it.

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> Codex and Claude Code are the best harnesses out there by a long shot. They work out of the box, require no real config, and just do the thing.

Even if I agreed, that doesn't address my point: Claude Code might be the world's best harness right now, but that doesn't stop an Anthropic employee coming along tomorrow and taking a giant steamy dump on the thing you like most about it. You're using their workflow, not your own.

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Sure, but their workflow is the best for Claude, and it's the same with Codex for OpenAI's models. These companies work and live with their own harnesses, they are ahead of the curve on what works for their models and what doesn't.
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