X AI Builder Pulse

NVIDIA's new tutorial shows how coding agents automate end-to-end RL research using NeMo RL and NeMo Gym.

Three agent skills enable reproducible...

Leading labs are responding differently to the compute crunch.

• Anthropic hired Monzo co-founder Tom Blomfield on leave from YC to address compute...

Sam Altman publicly mocked Anthropic's Claude promotional video on X, claiming he initially thought it was satire from a fake account. His sarcastic...

No significant updates today.

Anthropic's rapid talent spree reveals a compute-first strategy amid recursive self-improvement demands.

• Karpathy joined pretraining to build a...

Claude Code skills turn reusable preferences and new capabilities into automatic context, avoiding repetitive prompts.

• Firecrawl adds reliable web...

Key AI product updates from today's TLDR AI newsletter:

• Claude Code desktop now includes a sandboxed in-app browser for reading, clicking, and...

Musk and Altman's long-running rivalry flared again on X, with Musk labeling Altman a "scam" and Altman mocking Musk's space data center plans, all...

Monzo co-founder Tom Blomfield is joining Anthropic's compute team to tackle the industry's toughest challenge: securing massive scale. His hire...

Port's new AI Builder introduces vibe coding to platform engineering, letting teams build production-grade agentic SDLC workflows in natural language with embedded domain expertise, organizational context, and human-in-the-loop governance.

Anthropic adds Monzo cofounder Tom Blomfield to its compute team, marking another high-profile hire in the AI talent wars. Blomfield highlights compute as critical amid early recursive self-improvement.

Karpathy Releases

• 🔥 nanochat and LLM Council: Andrej Karpathy released nanochat, a ~$100 from-scratch ChatGPT clone, and LLM Council, an app...

Satya Nadella called out the hypocrisy of AI labs like Anthropic complaining about distillation attacks while relying on fair use to train on public...

Most still treat AI like a basic search box, typing and reading in manual loops. Loop engineering replaces this with automated research using Karpathy’s autoresearch repo and Bilevel Autoresearch.

Anthropic launched four Claude certification exams in March 2026 alongside the Partner Network and $100M commitment.

• Associate Foundations ($99):...

Anthropic's Claude lineup splits access and safeguards across Fable 5, Sonnet 5, and Mythos 5 while sharing core models. Fable and Mythos use the same...

Karpathy turns AI education into a hands-on weekend project with two practical tools.

• nanochat packs the full ChatGPT pipeline — tokenizer to...

Key takeaways for builders from this week's competitive moves:

• OpenAI targets work surface with ChatGPT Work agent, combining Codex into accessible...

Apple's lawsuit against OpenAI over trade secrets quickly turned into another public Musk-Altman clash on X, with both leaders trading personal barbs...

• Context window scarcity forces curation over volume, as attention degrades with excess material
• Four failure modes dominate: rot, poisoning,...