Evening brief

Saturday, June 6

4 people · 0 companies · 5 topics

TL;DR Anthropic filed a confidential S-1 with the SEC on June 1 at a $965B valuation. Claude Opus 4.8, out May 28, is now #1 on all major benchmarks: 96.7% on USAMO 2026 and 88.6% on SWE-bench Verified.

Models & research

  • model-releases Claude Opus 4.8 launched May 28 at $5/$25 per MTok. New in this release: Dynamic Workflows for parallel agentic tasks, Effort Control for tuning reasoning depth, and Fast Mode now 3x cheaper than Opus 4.7. It scores 96.7% on USAMO 2026 (a +27 pt jump in one cycle) and 88.6% on SWE-bench Verified, putting it at #1 overall on Artificial Analysis. Anthropic · TechCrunch

  • model-releases Microsoft dropped 7 new MAI models at Build 2026 on June 2. MAI-Thinking-1 is a 35B MoE with a 256K context window and 53% on SWE Bench Pro; MAI-Code-1-Flash handles code generation. All trained from scratch with no OpenAI distillation. simonw covered it same day. Microsoft AI · CNBC · Willison

People

  • karpathy started at Anthropic on May 19, on the pre-training team. His focus: using Claude to speed up pretraining research, part of Anthropic’s push to automate pieces of AI R&D. TechCrunch · Fortune

  • simonw published “AI enthusiasts are in a race against time, AI skeptics are in a race against entropy” on June 4. Probably the cleanest framing of the current discourse divide I’ve seen. simonwillison.net

  • hwchase17 shipped LangChain Engine: an agent that mines LangSmith production traces, patches the agent’s own code, and sets up evals without human prompting. LangChain Blog

  • natolambert is watching the political push to ban AI “distillation attacks” and thinks early legislation is moving too fast, with real second-order risk. Substack

Tools & dev

  • claude-code changelog this week: Auto mode on Bedrock, Vertex, and Foundry for Opus 4.7/4.8; the dynamic-workflow trigger renamed to “ultracode”; plugins in .claude/skills/ now load automatically. Releasebot

  • codex is at 5M weekly users. New: Codex Sites lets agents build and deploy internal apps from a prompt; 6 role-specific plugin bundles now available across data, sales, design, and banking. VentureBeat

OSS

  • opencode passed 150K GitHub stars and roughly 6.5M monthly active developers. Latest updates include adaptive reasoning controls for Anthropic Opus 4.7+ and WebSocket transport for OpenAI responses. GitHub

Other

  • Anthropic filed a confidential S-1 on June 1 at a $965B valuation, with ~$47B in annualized revenue. That’s ahead of OpenAI’s $852B mark. Anthropic · TechCrunch