🤖 AI Agents Weekly: Claude Fable 5, Kimi K2.7-Code, NotebookLM Goes Agentic, DiffusionGemma, MiMo Code, and More

Anthropic released Claude Fable 5, its first public Mythos-class model, achieving state-of-the-art results on long, multi-step reasoning and autonomous task completion. The model tops benchmarks like Cognition's FrontierCode and enabled Stripe to compress a 50-million-line codebase migration from two months to one day. Pricing is set at $10 per million input tokens and $50 per million output tokens, with rollout continuing through June 22.

🤖 AI Agents Weekly: Claude Fable 5, Kimi K2.7-Code, NotebookLM Goes Agentic, DiffusionGemma, MiMo Code, and More Claude Fable 5, Kimi K2.7-Code, NotebookLM Goes Agentic, DiffusionGemma, MiMo Code, and More In today’s issue: Anthropic ships Mythos-class Claude Fable 5 Kimi K2.7-Code open-sources a 1T coder NotebookLM becomes an agentic workstation Google’s DiffusionGemma generates text in blocks Xiaomi open-sources MiMo Code agent Cohere ships North Mini Code Gemini 3.5 Live Translate goes real-time Gemini-SQL2 tops BIRD text-to-SQL Apple rebuilds Siri on Google Gemini Grok opens a plugin marketplace Claude Code adds nested subagents Nex-N2 opens an agentic model series Extend UI ships document-agent components Cognition’s FrontierCode raises the eval bar Study questions the multi-agent advantage Recursive automates AI research And all the top AI dev news, papers, and tools. Top Stories Anthropic Launches Claude Fable 5, Its First Public Mythos-Class Model Anthropic released Claude Fable 5, a Mythos-class model made safe for general use, alongside the restricted Claude Mythos 5. It is the most capable model Anthropic has ever made widely available, and its lead grows the longer and more complex the task. State-of-the-art across the board: Fable 5 tops nearly every tested benchmark, with the widest margins on long, multi-step reasoning and autonomous task completion. Software engineering: Posts SOTA on Cognition’s FrontierCode, and Stripe reported it compressed a 50-million-line codebase migration from two months of human work into a single day. Agentic and vision: Holds focus across millions of tokens, runs roughly 3x better on strategic gameplay with persistent memory, and finished Pokémon FireRed from raw screenshots with no helper tools. Safeguards by fallback: Requests touching cybersecurity, biology, chemistry, or distillation are routed to Claude Opus 4.8 instead of refused, triggering in under 5% of sessions. Mythos 5 stays restricted to Project Glasswing partners. Pricing: $10 per million input tokens and $50 per million output tokens, with rollout across plans continuing through June 22.