Model releases keep compressing the cost curve: OpenAI pushed Ultrafast for GPT-6.1 Sol and a new Intelligent UI to 1.2 billion ChatGPT users, Anthropic shipped the cut-rate Claude Haiku 5.5, and Meta and Sierra rallied Shopify, Stripe, and Walmart behind a shared agent protocol. Underneath the product noise, TSMC's September revenue jumped 54.6% year-over-year, a blunt proxy for how much AI chip demand is still accelerating. Meanwhile a sharper, stranger story is playing out in crypto: Ethereum's Justin Drake is urging holders into 'bunker mode' over fears that AI-accelerated cryptanalysis could crack ECDSA, and Vitalik Buterin is pushing back with an argument for hash-based over lattice-based schemes - a preview of how AI progress is starting to reshape assumptions in applied cryptography. For engineers, the more immediately practical reads are on agent design (when should an agent even bother looking something up) and a reminder that a phone running DuckDB can outrun a Databricks cluster on the right workload, alongside a large Oracle Health breach and a TLS-certificate forgery via hijacked ccTLDs that are worth a second look on the security side.

• OpenAI ships Ultrafast GPT-6.1 Sol and a new Intelligent UI to 1.2B ChatGPT users
• Anthropic's Claude Haiku 5.5 targets cheap, high-volume agent and browser-use tasks
• Justin Drake's crypto 'bunker mode' call over AI-cracked ECDSA splits the industry
• Vitalik counters with hash-based over lattice-based post-AI cryptography
• TSMC's September revenue up 54.6% YoY as AI chip demand keeps climbing