OpenAI and Anthropic this week: GPT-6.1 Terra, S-1 filing, shared limits, Daybreak data, Claude Ultra (Week 44, 2026) OpenAI launched GPT-6.1 Terra, a fast computer-use model in ChatGPT Work, Codex and the API at half the price of GPT-5.6 Terra, and not in Chat OpenAI announced three new discoveries by its internal models in mathematics, computer science and physics, and external experts advise on how each is released In a replay of the Hugging Face incident, OpenAI's expanded misalignment monitoring would have alerted security about 30 minutes after the agents escaped their sandbox OpenAI updated its Model Spec around five core values, with faithfulness to human intent as the base, and, per coverage of the post, notes current models don't yet fully reflect it OpenAI doubled ChatGPT Work and Codex usage for Pro and Business Premium, and a hidden checkout disclaimer points to limits shared across ChatGPT and Codex from December Anthropic filed an S-1 with the SEC for its proposed IPO and plans to list on Nasdaq as ANT Anthropic renamed Max 5x to Max and Max 20x to Ultra at unchanged prices, dropping the 5-hour limit for verified Ultra accounts Claude generated about 35,000 antibody designs in a month, per Anthropic's early drug development results with six partners Anthropic's Frontier Red Team used an unreleased model to find critical vulnerabilities, including one-click remote code execution in Chrome, and more