Ethereum’s Vitalik Buterin Warns Against AI Agent Security Risks, Shares His Private LLM Stack

Ethereum co-founder Vitalik Buterin has moved entirely off cloud AI services and detailed his fully local, sandboxed artificial intelligence (AI) setup in a blog post published this week. Key Takeaways: Ethereum co-founder Vitalik Buterin abandoned cloud AI in April 2026, running Qwen3.5:35B locally on an Nvidia 5090 laptop at 90 tokens per second. Buterin found