Altman Pauses RL Training, Replit Launches Free AI Coding, Cursor Sells for ~$60B

Key Takeaways

1. Sam Altman halts some frontier RL training, tying AI progress to safety alignment.
2. Replit launches free AI coding with OpenAI's GPT-5.6 Luna, democratizing agentic development.
3. DeepSeek V4 Pro hits Perplexity Computer at 62% lower cost per task.
4. Cursor and OpenRouter deliver multibillion-dollar exits for a16z infra.
5. AI-personalized mRNA therapy cuts melanoma recurrence/death risk by ~49% in Phase 3.

1. AI Safety and Frontier Models

1. OpenAI CEO Sam Altman announced a pause on some frontier RL training to ensure alignment, safety, and monitoring standards keep pace with new capabilities. He emphasized that if model capabilities outpace safety alignment, he will act, and called for industry-wide coordination on safety standards while committing to act unilaterally. This suggests that safety confidence will directly determine the speed of AI progress, with Altman expressing optimism about alignment work. — via 1
2. Perplexity Computer now offers DeepSeek V4 Pro, hosted in the US. Perplexity CEO Aravind Srinivas reported a WANDR score of 0.359 and a per-task cost of $0.75, making it 62% cheaper than the next best cost-performance frontier model. This gives AI agents a more affordable, high-performance option for production workloads. — via 1
3. Miles v0.1, an open-source RL framework for LLMs and multimodal models, is gaining traction with 72 contributors and 1,326 commits, and has been adopted by several frontier model developers. It is designed to help debug, improve hardware efficiency, and support scalable RL training, filling a key gap in open RL infrastructure. — via 1

2. AI Coding Agents and Developer Platforms

1. Replit launched Free Mode, powered by OpenAI's GPT-5.6 Luna, to make agentic coding accessible to everyone. CEO Amjad Masad said that $20/month provides enough credits to build and deploy 10+ apps, create hundreds of AI designs, and automate daily tasks. The partnership with OpenAI is deepening, with multiple products planned together. — via 1 2
2. Vercel Labs open-sourced fx, a coding agent that is 10-20x smaller than mainstream coding CLIs, launches instantly, and is model-agnostic. It can be embedded in the browser and offers a zsh-like experience rather than a traditional terminal IDE, positioning it as a lightweight alternative for agentic coding. — via 1
3. Stripe Billing, including Metronome, was named a leader in Gartner's recurring billing magic quadrant for the third consecutive year. It is used by AI-native companies like Anthropic, Cursor, and Linear, reflecting the shift to usage-based billing demanded by high-volume AI products. — via 1

3. AI Economy: Exits, Healthcare, and Investment

1. a16z infra saw two major exits this week: Cursor was reportedly acquired for ~$60B, marking the largest private acquisition ever, and OpenRouter reportedly exited at ~$8B. These deals underscore the massive value being created in AI infrastructure and developer tools, though official confirmations are pending. (unverified) — via 1
2. AI-personalized mRNA cancer therapy, developed by Moderna and Merck using AI-based sequencing, succeeded in a Phase 3 trial. It reduced the risk of recurrence or death by ~49% in high-risk melanoma patients. Alexis Ohanian highlighted this as a striking example of AI's real-world impact beyond software. — via 1
3. Churchill Falls expansion, a collaboration between Quebec and Newfoundland and Labrador, is described as the largest clean-energy investment in North American history. It will nearly double generating capacity and support over 20,000 jobs, marking a major infrastructure milestone. — via 1