Free upgrade. Gone June 23.

Anthropic dropped its most powerful model ever on Tuesday. You can use it free until June 23. Then it costs extra. So, short issue this week — go try it before we finish writing this sentence.

On June 9, Anthropic launched Claude Fable 5 — the first publicly available version of its Mythos-class model, which until last week was restricted to 150 security organisations across 15 countries. Now it's in your Claude app. For free. Until June 23.

After that, Anthropic pulls it from all subscription plans — Pro, Max, Team, Enterprise — and moves it to a separate credits system. They've said they want to bring it back as standard, but only once they have the capacity. No date given.

What's actually different? Anthropic says the longer and more complex the task, the larger Fable 5's lead over everything else they make. Analytics firm Hex found it was the first model to hit 90% on their hardest benchmark. Vibe-coding platform Base44 said it's better at completing full apps in a single pass. The pricing once credits kick in is $10/$50 per million tokens — double Opus 4.8's rate.

For UK SMBs not running API pipelines, the practical message is simple. You have 12 days of free access to the best model Anthropic has ever shipped. Use it on something hard. That proposal you've been putting off. The strategy doc nobody wants to write. Don't spend it asking it to summarise emails.

This week at London Tech Week, Tech Nation reported that UK AI startups raised more than $11 billion in venture capital in just the first six months of 2026, beating the previous full-year record. AI now takes 77% of all UK VC. The Prime Minister was there. The Mayor of London announced a £12 million AI support package for London SMEs. Everyone clapped.

Meanwhile, government research shows only 12% of UK businesses currently using AI have seen revenue go up. Not 12% of all businesses. 12% of the ones already doing it. The other 88% are more efficient now, maybe. But they're not making more money yet.

Billions of pounds of investment, a Prime Minister on stage, a Mayor with a cheque — and the revenue number sits at 12. That gap isn't fixed by more funding. It's fixed by businesses using AI on the right tasks, not just using AI.

Two of these are new this month. All three are on paid Claude plans.

• Fable 5 on your hardest task — Open Claude, switch to Fable 5 in the model picker. Give it something genuinely difficult: a multi-part proposal, a contract summary, a pricing strategy. Don't waste it on anything you could do in five minutes yourself. Access is free until June 23.

• Schedule an agent to run without you — Claude Managed Agents now support cron-based scheduling in public beta on the Claude Platform. Set an agent a recurring task — weekly client digest, nightly data check, Monday morning status draft — and it starts a new session automatically each time the schedule fires. No server to host, no scheduler to build.

• Dreaming mode for agents that learn — Also new in public beta: a scheduled process that reviews past agent sessions, surfaces patterns, and curates memory. Agents that run repeatedly get better between runs. Recurring mistakes and shared workflow preferences get pulled into a more useful memory store over time.

Fable 5 landed Tuesday and the reaction was immediate. Andrej Karpathy called it a major-version-bump-deserving step up. Boris Cherny, who built significant parts of Claude Code, said it's the best coding model he's used by a wide margin. The 12-day free window has people moving fast.

You know this one. A potential client asked for a proposal three weeks ago. You said you'd have it by Friday. Then the next Friday. It's not that you don't want the work. It's that opening a blank document and writing something that has to be both impressive and accurate and priced correctly and delivered before they forget who you are feels like a lot for a Tuesday afternoon.

This is precisely where Fable 5's long-horizon capability changes the dynamic. Not because it writes the proposal for you, but because it can hold the whole thing in its head at once — your service offering, their brief, your pricing logic, the structure, the tone — and work through it in one sustained pass without losing the thread halfway through.

Open Fable 5. Paste in everything you know about the client: their brief, their industry, any emails they've sent. Tell Claude what you charge, what's included, what your edge is. Ask it to draft the full proposal. Then spend 20 minutes editing it into your voice rather than two hours staring at a cursor.

The proposal still needs to sound like you. But 'you at your best, quickly' is what Fable 5 is actually good at. And you've got until June 23 to find out for free.

Watching the Tech Nation numbers and thinking about that 12% revenue figure. All that capital, all those keynotes, and the honest answer is still: most businesses haven't found the right task yet. That's not a disaster. It's a direction.