Anthropic launches Claude Fable 5 Mythos-class model

#1 📝 Anthropic News

Claude Fable 5 and Claude Mythos 5 - On June 9, 2026 Anthropic launched Claude Fable 5, a Mythos‑class model made safe for general use that it claims is state‑of‑the‑art across benchmarks (notably speeding a reported Stripe migration of a 50‑million‑line Ruby codebase from months to a day, topping Cognition’s FrontierCode and Hebbia finance benchmarks, excelling at vision tasks like beating Pokémon FireRed using only screenshots, and maintaining focus across millions of tokens), with conservative safeguards that reroute some queries to Claude Opus 4.8 and trigger in under 5% of sessions. They also launched Claude Mythos 5 — the same underlying model but with safeguards lifted for a small group of cyberdefenders via Project Glasswing (and planned broader trusted access later) — and set pricing at $10 per million input tokens and $50 per million output tokens.

Also covered by: @There's An AI For That, @Peter Yang, @Mike Krieger, @Claude

#2 𝕏

Google AI launched Gemini 3.5 Live Translate, a new audio model for live speech-to-speech translation in over 70 languages that begins streaming seamless translations the moment you start speaking.

Also covered by: @Jeff Dean, @Google DeepMind, @Google DeepMind

#3 𝕏

Philipp Schmid launched Gemini 3.

#4 𝕏

Mike Krieger launched Claude Fable 5, the first user‐accessible Mythos-class model he’ll hand off entire projects to. He then used it over two days to build a proactive, self-maintaining media tracker.

Also covered by: @There's An AI For That, @Peter Yang, @Mike Krieger, @Claude

#5 𝕏

xAI partnered with Gopuff to launch a personalized shopping assistant. It integrates chat, voice, and image AI models to make product discovery and ordering more intuitive.

#6 𝕏

clem 🤗 – Co-founder & CEO @HuggingFace announced a multi-million-dollar partnership with @arcee_ai, making them the first major US AI lab to migrate all public and private models and datasets from AWS S3 to Hugging Face.

#7 📝 Claude Code Blog

New in Claude Managed Agents: run agents on a schedule and store environment variables in vaults - Claude Managed Agents now support scheduled runs and secure storage of environment variables in vaults, making production orchestration and secret management easier. This is a product announcement aimed at improving reliability and security for agent-based workflows.

#8 𝕏

Philipp Schmid unveiled Google’s Gemini Live-Translate API (Gemini Live 3.5 Translate), linking to full docs, a GitHub examples repo, and a detailed blog post on its real-time translation capabilities.

Also covered by: @Jeff Dean, @Google DeepMind, @Google DeepMind

#9 📝 Simon Willison

If Claude Fable stops helping you, you’ll never know - Jonathon Ready highlights a passage from Anthropic's Fable 5 / Mythos 5 system card describing silent safeguards that limit model effectiveness on requests related to frontier LLM development. Simon Willison criticizes the idea of invisible interventions that intentionally degrade answers about topics like ML accelerator design.

#10 𝕏

Julien Chaumond – Co-founder and CTO at @huggingface released safetensors v0.8.0 on Apple Silicon, loading tensors directly into MTLBuffers and handing them to PyTorch via DLPack to eliminate needless memory copies.

#11 𝕏

Boris Cherny shows that running `/usage` in Claude Code’s terminal provides a detailed breakdown of token usage by skills, MCPs, and plugins. He warns that token bloat usually stems from a faulty plugin.

#12 𝕏

v0 now auto-detects secrets in your prompts and converts them into environment variables to simplify secure credential management.

#13 𝕏

Cursor compares Claude Fable 5’s performance across every major model and shares the full evaluation results at cursor.com/evals.

#14 𝕏

Cursor launched Claude Fable 5 in its platform, hitting a new state-of-the-art on CursorBench with a 72.9% score—8 points above the previous best.

Also covered by: @bolt.new, @Cognition

#15 𝕏

Peter Yang shares a 9-step guide to pinning the OpenAI Codex web app to your iPhone Home Screen and urges @OpenAI to offer a simpler shortcut in future.

#16 𝕏

v0 now supports Claude Fable 5 on its Premium and Team plans—try it at https://v0.app/?fable5

Also covered by: @bolt.new, @Cognition

#17 📝 Simon Willison

Setting a custom price for a model in AgentsView - Simon describes how he used Claude Fable 5 to reverse-engineer AgentsView's pricing database and provides a recipe to set custom prices for models, illustrated with a treemap of his Fable usage and a screenshot of the cost analytics dashboard.

#18 ▶️

WTF Is an "AI Agent Loop"? Genius or Hype?

Greg Isenberg

#19 ▶️

Claude Fable 5 - is this Mythos model worth the wait?

How I AI Podcast

#20 𝕏

Summary: Logan Kilpatrick says Google AI Studio now generates over 1.2 million apps per week, reaching more than 18 million since late February and still accelerating.

#21 𝕏

Logan Kilpatrick rolled out Native Android App support along with Gmail, Docs, Calendar and more, inviting users to try building their own app.

#22 𝕏

LlamaIndex 🦙 launched Granular Bounding Boxes in LlamaParse, delivering word-, line-, and cell-level coordinates for every extracted value so you get a fully auditable trail from each datum back to its exact spot in the document.

#23 𝕏

Santiago praises a new AI analytics tool that exposes its SQL queries to curb hallucinations, delivers instantaneous results at any scale, and can be deployed everywhere via MCP.

#24 𝕏

Andrej Karpathy highlights Claude Fable 5—a Mythos‐based model with added safeguards—as a SOTA, step-change upgrade that excels at long-form, difficult problem-solving.

#25 𝕏

Sebastian Raschka points out Anthropic is deliberately limiting Claude’s effectiveness on frontier LLM development requests to dig a deeper competitive moat.