AI Security Hardening Meets Massive Compute Growth (Links) – May 19, 2026

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Mozilla: Behind the Scenes Hardening Firefox with Claude Mythos Preview – Mozilla Hacks (May 7, 2026)
Mozilla used advanced AI models, including Claude Mythos Preview, and a custom harness to find and fix hundreds of latent Firefox security bugs, including sandbox-escape issues. The pipeline scales discovery, reproduces proofs-of-concept, and helps harden the browser against attacks.
Anthropic: Higher usage limits for Claude and a compute deal with SpaceX
A new SpaceX deal adds over 300 megawatts and 220,000 GPUs. Combined with Amazon, Google, Microsoft, and Fluidstack deals, this boosts global compute. Usage limits for Claude Code and Opus APIs are raised, and regional capacity will aid compliance.

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