AI News – June 16, 2026 1. Full System Prompt of Claude Fable 5 Leaked on GitHub Pliny the Liberator published the complete system prompt of Claude Fable 5 approximately 120 thousand characters along with full details of the multi-agent Pack Hunt attack using query decomposition homoglyphs and advanced prompt engineering techniques. The incident intensifies the debate on the real robustness of frontier model guardrails. 2. Class Action Lawsuit Against Anthropic for Misleading Premium Plan Advertising A class action filed in California accuses Anthropic of deceiving users with the marketing of Claude Max 5x and Max 20x plans that promise five and twenty times more tokens but deliver significantly lower and opaque actual limits. 3. 97 Percent of Developers Now Use AI Coding Tools According to Black Duck study 97 percent of developers already use AI coding tools with GitHub Copilot at 83 percent adoption and Claude Code at 63 percent. The report highlights productivity gains but also new challenges in code governance and security. 4. Zhipu AI Releases GLM-5.2 Focused on Advanced Coding and Agents Chinese company Zhipu AI launched GLM-5.2 with a one-million-token context window improved reasoning modes and strong emphasis on complex coding tasks and autonomous agents. It is available via API and its full open source version under MIT license is expected next week. 5. xAI Releases Product Updates Including Agent Dashboard and Grok in Warp Terminal xAI announced an Agent Dashboard in Grok Build and direct Grok integration into the Warp terminal allowing existing subscriptions for agentic command-line tasks. These updates strengthen the focus on practical tools for developers and coding. #AI2026 #ArtificialIntelligence #LLMs #AINews