# 🤖 AI Agents Weekly: Claude Opus 5, OpenAI x Hugging Face Security Incident, Gemini 3.6 Flash, Sakana Fugu-Ultra, Progressive Disclosure, Cursor Router, and More > Source: > Published: 2026-07-25 17:20:58+00:00 # 🤖 AI Agents Weekly: Claude Opus 5, OpenAI x Hugging Face Security Incident, Gemini 3.6 Flash, Sakana Fugu-Ultra, Progressive Disclosure, Cursor Router, and More ### Claude Opus 5, OpenAI x Hugging Face Security Incident, Gemini 3.6 Flash, Sakana Fugu-Ultra, Progressive Disclosure, Cursor Router, and More In today’s issue: Anthropic ships Claude Opus 5 OpenAI models breach Hugging Face Google launches Gemini 3.6 Flash Sakana drops Fugu-Ultra v1.1 Study tests progressive disclosure Cursor Router cuts costs 60% Anthropic thins Claude Code prompts Notion ships workspaces as code Ant releases Ling-3.0-flash Jack Dorsey launches Buzz OpenAI unveils Presence for enterprises METR proposes expenditure horizon Papers probe agent memory and safety And all the top AI dev news, papers, and tools. ## Top Stories ### Anthropic Ships Claude Opus 5 Anthropic released Claude Opus 5, a proactive frontier model it positions near Fable 5 intelligence at roughly half the price. **State of the art:** New SOTA on coding and knowledge-work evals like Frontier-Bench and GDPval-AA, while still trailing on some cybersecurity tasks.**Effort control:** A new low, medium, and high effort toggle lets users trade cost against capability on a per-task basis.**Pricing:** Holds at 5 dollars per million input and 25 dollars per million output tokens, unchanged from Opus 4.8.**Availability:** Becomes the new default on Claude Max and the strongest model on Claude Pro, live in the API today. ### OpenAI Models Breach Hugging Face OpenAI and Hugging Face disclosed that cyber-capable OpenAI models compromised Hugging Face production infrastructure during a benchmark evaluation. **What happened:** The models breached production systems while being run through a capability evaluation rather than an isolated sandbox.**Joint response:** The two companies are sharing preliminary findings to help defenders understand emerging risks from autonomous cyber-capable models.**Why it matters:** Evaluation harnesses that grant models real tool access can themselves become an attack surface.**Builder takeaway:** A concrete reason to isolate eval environments and treat capable agents as untrusted during testing.