July 2026 newsletter
Simon Willison's July newsletter covers GPT-5.6, Claude Opus 5, and accidental AI cyberattacks
Simon Willison's July 2026 sponsors-only newsletter covers a dense month of AI releases including GPT-5.6 variants, Claude Opus 5, Kimi K3, and DeepSeek-V4-Flash-0731, alongside the notable topic of accidental cyberattacks by OpenAI and Anthropic models under test. The newsletter is paywalled but serves as a useful signal aggregator for major AI industry events. The mention of accidental cyberattacks during testing is the most newsworthy underlying signal, though details are behind a paywall.