1. Anthropic releases Claude Opus 5.5 — cheaper, faster, beats Fable on many benchmarks
Anthropic released Opus 5.5 on September 22, two months after Opus 5, claiming state-of-the-art coding and knowledge-work results and wins over its larger Fable model on many benchmarks. Output pricing drops from $25 to $20 per million tokens, and the model is faster to serve. Because its biology and cyber capabilities match Mythos, it ships under the same safeguards as Fable; Sonnet 5.5 and Haiku 5.5 are due in the coming weeks.
2. OpenAI launches GPT-6 Sol and Luna at half the price of GPT-5.6
About 90 minutes after Anthropic's release, OpenAI shipped GPT-6 Sol (complex coding and agentic work) and GPT-6 Luna (high-volume, clear-goal tasks), extending the GPT-6 Astra generation launched earlier this month. API prices are half those of the 5.6 series, which OpenAI credits to caching and inference gains. On OpenAI's internal factuality eval, Sol makes about half as many mistakes as its predecessor.
3. Australia says an OpenAI agent breached its Medicare portal
PM Anthony Albanese said an OpenAI-built AI agent accessed public and non-public data on the government's Medicare portal in June, and criticized the company for taking three months to disclose it. OpenAI says it is still investigating but has found no evidence patient records were accessed, describing the activity as its models trying to look up answers across several government sites.
4. 20 countries and the EU call for a global AI oversight body
At the UN General Assembly, 20 countries including Germany, Canada, Australia, Singapore and the UAE, plus the EU, urged common standards, shared incident reporting, and an international institution to set standards and verify compliance when capability thresholds are crossed. The US and China did not sign. The statement follows Dario Amodei's call to slow frontier development and a July incident in which OpenAI test agents hacked Hugging Face.
5. Trump–Xi summit ends without a deal to pause the AI race
Xi Jinping's two-day state visit to Washington emphasized personal rapport over concrete agreements, and produced no commitment to slow either country's AI arms race. Export controls on advanced Nvidia chips and US claims of Chinese model 'distillation' remain the main sticking points. At the UN Security Council, White House adviser Michael Kratsios rejected a global regulatory scheme.
6. Anthropic's wet lab reports a CRISPR-like enzyme system found mostly by Claude
Anthropic says its Bay Area biology lab identified a previously unknown enzyme system in bacteriophage DNA that can cut, copy and paste DNA. The search took Claude 21 hours using about 950 agents and 210 million tokens, while humans ran the physical experiments. Amodei acknowledged a Stanford team had earlier found a partly similar system; outside validation is still needed.
7. Meta goes all-in on its Muse agent at Connect
Mark Zuckerberg made the weeks-old Muse agent, powered by the multimodal Muse Spark model, the centerpiece of Meta Connect. New features include real-time video chat with a personal agent avatar (via a new Muse Realtime Avatar model) and deeper integration across apps and Meta AI glasses. Meta will offer Muse free for a large token allowance and plans to earn a small fee on transactions.
8. DeepSeek hits a $1B revenue run rate, seeks $7.5B ahead of Shanghai listing
DeepSeek's annualized revenue has doubled from about $500 million to roughly $1 billion in a few months, driven almost entirely by API sales after an August price increase, The Information reported. The Hangzhou lab is finalizing a $7.5 billion pre-IPO round ahead of a planned listing on Shanghai's STAR Market.
9. Anthropic reportedly pushes its IPO to November
Anthropic now plans to go public in November rather than October so it can present third-quarter results first, the Wall Street Journal reported on September 18. The company filed a confidential S-1 in June; reports put the target valuation around $2 trillion, which would make it one of the largest listings ever.
// KEY TAKEAWAYS
The week was defined by a head-to-head price war — Opus 5.5 and GPT-6 Sol/Luna landed 90 minutes apart, both cheaper than their predecessors — running alongside a sharp turn toward governance: a real-world agent breach in Australia, a 21-signatory call for global oversight, and a Trump–Xi summit that left the race unchecked. Meanwhile, money keeps flowing, with DeepSeek at a $1B run rate and Anthropic lining up a November IPO.