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.