​Claude Build Day · Claude Fable 5.1

​Claude Fable 5.1 just shipped, and we're putting it to work. 🚀 The Claude Community Build Day lands in San Francisco on Saturday, September 19. A full day building on Anthropic's most advanced model, days after launch.

​What it's about

​Building, not listening. The official launch video, two Anthropic demos running live, then straight into one continuous build block with hands on keyboards and no breaks. At the end, every team shows what they built in two minutes. Part of the official Claude Community Build Day series.

​What you get

​$100 USD in API credits per attendee to keep building after the event.
Exclusive launch content: Anthropic's official video on what's new in the model, screened only inside the event.
Global reach: your build and the recap go into the roll-up Anthropic sends to the entire Ambassador network.
A direct line to product: feedback from the room reaches Anthropic's product and model teams.

​The three tracks

​Delight · Build something surprising, beautiful or fun that you couldn't have built this well or this fast before.
Breakthrough · Bring a problem the previous model couldn't solve and measure how far this one gets.
Everyday · Solve a real problem from your day to day: reliability, tool use and real workflows.

​You pick the track. Solo or in teams of two to four. Everyone builds, everyone demos.

​Agenda

​To be confirmed. We'll update this page and email approved guests as soon as the schedule is locked.

​Who it's for

​Developers, founders, researchers and builders who want to go from playing with Claude to shipping with Claude. No API experience required, just the itch to build.

​What to bring

• ​Laptop with Claude Desktop and Claude Code installed before the event

• ​Charger

• ​An account on console.anthropic.com with an Organization created (credits are redeemed there, not on a personal Claude.ai account)

​Coffee, water and snacks available all day.

​Details

• ​Date: Saturday, September 19, 2026

• ​Time: 9:00 AM to 4:00 PM PDT

• ​Venue: San Francisco, exact location shared with approved guests

• ​Language: English

​Registration

​Approval-based: request your spot and we'll confirm by email (confirmation only comes through Luma). Limited seats.