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Anthropic introduced Claude Opus 5 as a more efficient model approaching Claude Fable 5's capabilities at half the price. It reportedly led several coding and knowledge-work benchmarks and became the default model for Claude Max.

Context engineering for Claude 5 generation models has changed a lot, allowing for greater flexibility and better results by reducing unnecessary constraints previously placed on the system prompts and code documentation. System prompts have tended to be smaller, allowing the model to be more intuitive and use progressive disclosure through skills.

BleepingComputer was alerted to a new malware campaign where attackers are using Steam Forum posts asking for help solving problems to distribute malware using ClickFix attacks, suggesting users run PowerShell commands that will fix their issue. The command downloads and runs a fake Windows Optimization tool that claims to run several PC tuneup tasks but actually installs the XMRig malware. The tool also kills existing XMRig processes, installs itself as a scheduled task that runs at startup, and adds Windows Defender exceptions for it