GritAI

Claude Community Oslo · Mesh · Sep 14, 2026

Fable 5.1 Build Day.

Two hours of building on Fable 5.1 at Mesh, demos at 20:30. This page gets you set up before the build block starts.

  • 17:30Doors
  • 18:00Kickoff
  • 18:30Build
  • 20:30Demos
  • 21:00Wrap up
The evening on Luma

Get started

Five things, then build.

The build block is short and setup eats it. Do these first.

Claude Code installed and signed in

Open a terminal in an empty folder, run claude, and check that it answers. If it does not, wave, helpers are here for exactly this.

The latest version

Run claude --version in the terminal, then claude update. It installs the newest release if you are behind. The new model needs a recent version.

Fable 5.1 selected

Type /model and pick Fable 5.1. The point of the evening is the new model, so check you are on it.

One folder per idea

Start every build in its own empty folder. Claude Code reads what is there, so an empty folder is a clean start.

A team, or not

Solo or two to four people. Teams form on the spot, so talk to the table next to you.

Pick a track

Three ways to push the model.

Build something of your own choosing that pushes Fable 5.1. Say which track you picked when you demo.

  • Delight

    Build something surprising, or beautiful, or fun. The bar is that you could not have made it this good, this fast, before.

    What it tests

    Creativity, taste, and how far the model runs with a loose brief.

    For example

    • A 3D game with physics and sound, no engine, one HTML file
    • A visualiser that listens to the microphone and paints what it hears
    • A text adventure that writes itself as you play, with a map that grows

  • Breakthrough

    Build something you could not build before. Bring a problem the previous model could not handle and see how far the new one gets.

    What it tests

    Reasoning, long context and agentic depth. The comparison with what came before is the point.

    For example

    • A compiler for a small language of your own, with passing tests
    • A chess engine that beats you, written from the rules alone
    • An agent team that researches, builds and reviews its own pull request

  • Everyday

    Build something that solves a real problem in your life.

    What it tests

    Reliability, tool use, and fit into real workflows.

    For example

    • A meal planner that turns what is in the fridge into a week of dinners and a shopping list
    • A receipt scanner that reads photos and keeps the household budget
    • A trip planner that builds the itinerary, the packing list and the map

How to build tonight

Start by talking the idea through.

What we have learned from the bootcamps and meetups at Mesh. The interview prompt is the one we start almost everything with.

Talk before you type

Open with two sentences about what you want and ask Claude Code to interview you before it builds. Its questions replace the plan you would otherwise have to write.

Get it running, then improve it

Get something on screen in the first twenty minutes, then improve it in rounds. A rough version you can show beats a polished one you cannot.

One file, no libraries

A single self-contained HTML file is the right size for an evening, and it means the demo runs on any laptop in the room.

Push the new model

Whatever you build, lean on something Fable 5.1 does better than before, and be ready to say what that was. That is the question everyone gets at the demo.

Stop at the warning

When the ten minute warning comes, stop adding and start making it showable. Two minutes go fast.

Terminal
❯ I want to build [two sentences about the idea]. Interview me about who it is for and what the first version must do, then write what we agree to SPEC.md and build from that.

The evening as a loop

IdeaTwo sentencesInterviewClaude Code asks, you answerRounds until 20:20BuildRun itLookNot good yet, go againDemoTwo minutes, no slides

If you are stuck

Three prompts to start from.

Each one is a single message that gets you a running program. Paste it into Claude Code, watch it run, then change it. All three ask for one HTML file with no libraries, which is a good constraint for two hours.

Model a realistic star system

Claude
Show a top-down animated model of a fictional star system: one star and six planets with invented names, distinct colours and orbits of clearly different sizes, at least one noticeably elliptical, and make it look like an elegant museum exhibit readable from across a room. Beside the view show a live table per planet: semi-major axis, orbital period measured from the simulation itself once an orbit completes, the period predicted by Kepler's third law from the star's mass, and the percentage difference, highlighting a row green when they agree within one percent; also show total system energy with its drift since start. Let me click a planet to follow it, scroll to zoom, drag a time-speed slider, and press a button to add a new random planet that starts being measured too. Draw thin fading orbit trails on a dark starfield with a soft glow on the star, choose the default time scale so the outermost planet completes an orbit in about thirty seconds, and start running immediately, framed to fit. Move the planets with real Newtonian gravity from the star using a symplectic integrator (velocity Verlet), not pre-computed ellipses. Create it as one self-contained HTML file, no external libraries or assets.

Conduct an orchestra with your hands

Claude
Create an "orchestra conductor simulator game" in HTML/JS. I'd like for it to use the webcam to detect my hand movements to understand how I'm waving a conductor wand. I'd like to conduct the orchestra through the song Twinkle Twinkle little star. As I speed up my hand movements, the orchestra should speed up and vice versa if I slow down. When I put my hands down or motion is not detected, the orchestra should stop playing. Keep it to a single self-contained HTML file with no external libraries: detect the motion by comparing successive webcam frames, and synthesize the instruments with the Web Audio API. Make it beautiful and stage-worthy: show a concert-hall stage where each section of the orchestra visibly lights up as it plays its notes, my mirrored webcam view with the detected motion drawn over it, a big live tempo (BPM) display, and the current lyric line.

A four-stroke engine built from equations

Claude
Build me an interactive, visually stunning simulation of a four-stroke car engine, from first principles. Compute the thermodynamics live: fuel burning, pressure on the pistons, torque, and the exhaust pulses turned into engine sound. Draw the engine as a big animated cutaway — pistons, connecting rods, crankshaft, valves opening and closing, the spark and the flame — and show the pressure–volume loop being drawn in real time next to it, with the work per cycle integrated live from the area inside the loop. Give me a throttle slider, an RPM readout, and a way to switch between 1, 4 and 8 cylinders, and make it beautiful. Build it as a single HTML file with no external libraries, make it run at 60 fps, and keep the code clean and correct so it works perfectly the first time it is opened.

API credits

100 dollars to build with.

Each participant gets 100 dollars in API credit, first come, first served. The one thing that goes wrong is applying with a personal account instead of an organisation.

  1. 01Go to platform.claude.com and sign in

    Or create an account. This is the developer console, not your Claude.ai profile.

  2. 02Create or select an Organisation

    The credit attaches to the organisation, so you need its Org ID from the Console.

  3. 03Open the offer and apply with that organisation selected

    The link is below. Sign up by 21 September.

  4. 04Create an API key for the session

    In the Console, under Settings, then API keys. Optional if you only use Claude Code tonight, it can sign in to the Console account without a key.

  5. 05Check Settings, then Billing, for your balance

    Done.

Apply for the credit

Questions people ask

The code will not apply. What is wrong?

Almost always it is being redeemed against a personal user instead of an organisation. Go to platform.claude.com, switch to the organisation, copy its Org ID from the Console, and apply again with that organisation selected.

Where do I find my Org ID?

In the Console at platform.claude.com, under the organisation settings. It is not the same as your Claude.ai profile, and a Claude.ai login alone does not give you one. Create an organisation first if you do not have one.

I have a Claude subscription. Do I still get the credit?

Yes. The credit is API credit on the developer platform, which is separate from a Claude Pro, Max or Team subscription. You need a Console account with an organisation to receive it, whichever subscription you have.

Can I use the credit in Claude Code?

Yes. Run /login in Claude Code and pick Anthropic Console account, which is the developer platform rather than your subscription. Usage then draws on the organisation's credit, and /status shows which account is active. Signing in that way logs you out of your Claude.ai login on that machine, so run /logout afterwards to get your subscription back. Setting ANTHROPIC_API_KEY to a key from the organisation does the same, and it wins over a subscription login.

When does the credit show up?

Once the application is approved, the balance appears in the Console under Settings, then Billing. Apply as early as you can, it is first come, first served, and the offer closes on 21 September.

Nothing works. Who do I ask?

Wave. The helpers in the room have seen every version of this, and the fix is usually the organisation switch above.

Demos at 20:30

Two minutes each, from your own laptop.

Everyone who built something shows it.

Four things to say, then the demo.

  1. 01Which track you picked
  2. 02What you built
  3. 03Which new capability it leans on
  4. 04What surprised you

Share with Anthropic

Built something tonight? Tell Anthropic.

Anthropic collects the builds from every build day. It takes two minutes. What you built, what worked, what Fable 5.1 did differently. What you submit may be featured on Claude's social channels.

Open the form

Scan or visit

form.typeform.com/to/VIUAjxNi

Before you leave

Three things.

Group photo

Join for a photo, take your own and share it online. Tag Claude Community and GritAI.

Submit your build

Two minutes in the form above, before you pack up.

Next event

A special event at NDC Oslo tomorrow, 15 September. Claude Community Conversations at Mesh on 30 September.

Next up

  • Sep 15, 2026

    Special event at NDC Oslo

    Tomorrow.

    NDC Oslo

  • Sep 30, 2026

    Claude Community Conversations at Mesh

    Where everyday users, sceptics and builders discuss what AI does to society and to this city.

  • Sep 30, 2026

    Claude Code bootcamp for developers

    A full day at Mesh, in your own repository.

    The developer bootcamp

Updates come on LinkedIn. Follow Aleksander Stensby for the next dates, and get in touch there if you want to speak or sponsor the pizza.