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PLUS: Jensen's open-weight letter shakes things up
Anthropic updated its prompting guide and deleted 80% of Claude Code's system prompt for Opus 5 with zero loss on evals.
Cursor adds Claude Opus 5, matching Fable at half the price and compatible with Zero Data Retention.
OpenCode hit 13 million monthly users and $40M ARR after Anthropic's clampdown accidentally fueled its growth, says YC.
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