Unfortunately they seem to have straight up broken Claude Code either with this release in the backend or the new CC version. Errors about "can't modify thinking blocks" are bricking long-running sessions: https://github.com/anthropics/claude-code/issues?q=is%3Aissu...
That is part of the charm of working with Claude. Every time they release anything new - all your shit will break.
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Same. It's not a good look to have happen right when they roll out a new model.