Are you using Claude Code? If so you have to update to the latest version. The system prompt in the older version of Claude Code don't work for Opus 4.7 and causes a bug similar to the one you are describing.

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decide1000 5 hours ago | parent [-]

I am on the latest version available for me 2.1.98

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eutropia 5 hours ago | parent [-]

Version 2.1.113 is available as of this comment. I think the brew version lags behind the other ways of installing it.

	▲	decide1000 4 hours ago \| parent [-]
		I am not using brew. Just checked and it still says 2.1.98. Will try manual update.