Claude Fable 5 in Action, AI Agents Go Shopping and the Product That Improves Itself

This week: Anthropic's Claude Fable 5 arrives as the first public Mythos-based model, AI agents get the ability to spend your money, and Amplitude bets on a future where products improve themselves.

We cover how Fable 5's classifier system routes risky queries to a safer fallback model, what people are already building with it (games, video edits, landing pages, API diagrams), and the key prompting principles from Anthropic's new guide - including why intent matters more than instructions, how to use parallel subagents, and why effort is now a dial.

Then we get into agentic payments: Visa and OpenAI's new tokenized transaction partnership, Mastercard's Agent Pay for Machines infrastructure for machine-speed micropayments, and Coinbase's MCP server that lets agents rebalance your crypto portfolio and pay for research data automatically.

We also look at Amplitude's Wave - an agent that runs the full product improvement loop from signal to ship to measure - and ask whether self-improving products are the next frontier, or just AI-optimized products without a soul.

Finally, data from Lovable's Build Economy report (80% non-technical builders, 60% haven't made money yet), Google's 1.2 million vibe-coded apps per week, HBR's finding that therapy and companionship now account for 11% of all AI use cases, and Atlassian research showing that admitting you use AI at work makes colleagues rate you 10x lazier.

➡️Get more analysis on Substack: https://departmentofproduct.substack.com/

🔗 LINKS

Fable 5
Anthropic Fable 5 release: https://www.anthropic.com/news/claude-fable-5-mythos-5
Anthropic Fable 5 prompting guide: https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-fable-5
Minecraft roller coaster (single shot): https://x.com/JinjingLiang/status/2064437608495919138
Table tennis game: https://x.com/McGreenBeats/status/2064746187354149316
Video editing deck: https://thariqs.github.io/cc-video-editing-deck/
Video editing thread: https://x.com/trq212/status/2064826394589442448
Single-shot API architecture diagram: https://x.com/backnotprop/status/2064461973442707942
Liquid glass SaaS landing page: https://x.com/alexprokhorov/status/2064467938522857562

Agentic Payments
Visa x OpenAI announcement: https://www.businesswire.com/news/home/20260610422687/en/Visa-Partners-with-OpenAI-to-Power-the-Next-Generation-of-AI-Commerce
Mastercard Agent Pay for Machines: https://www.mastercard.com/us/en/news-and-trends/press/2026/june/mastercard-launches-agent-pay-for-machines.html
Coinbase MCP for agent trading: https://techcrunch.com/2026/06/11/coinbase-debuts-mcp-for-agent-trading/
A guide to new Agentic Payment Abilities and Features https://departmentofproduct.substack.com/p/new-agentic-payment-abilities-and

Self-Improving Products
Amplitude Wave: https://amplitude.com/wave
Jack Dorsey on company intelligence: https://block.xyz/inside/from-hierarchy-to-intelligence

Data & Trends
Lovable Build Economy report: https://thebuildeconomy.lovable.app/
Logan Kilpatrick on Google app generation: https://x.com/OfficialLoganK/status/2064423388928790943
HBR AI use case study: https://hbr.org/2026/06/how-people-are-really-using-ai-in-2026
Atlassian research on AI disclosure: https://www.atlassian.com/blog/ai-at-work/new-research-shows-honesty-about-ai-use-at-work-is-backfiring

00:00 Welcome and rundown
00:35 Fable 5
04:35 Agentic payments updates
06:05 Self improving products
07:25 Data and trends roundup

Видео Claude Fable 5 in Action, AI Agents Go Shopping and the Product That Improves Itself канала Department of Product