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Building the Firefox-in-WASM project cost an estimated $25,000 worth of Claude Opus and Fable tokens, made feasible by a Claude Max subscription.

The porting effort relied heavily on AI assistance, consuming an estimated $25,000 in Claude Opus and Fable token usage, made affordable via a Claude Max subscription. ✦ AI generated

Simon Willison · Simon Willison's Weblog · 2026-07-16 · original ↗

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The project took an estimated $25,000 of Claude Opus and Fable tokens, taking advantage of a Claude Max subscription plan.

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✳ Claude Max ✳ Claude Opus ✳ Fable

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In six weeks, Claude Mythos found vulnerabilities in Palo Alto Networks' code that would have taken five to seven years to find using traditional methods, at a cost in the low millions.Nikesh Arora · All-In Podcast · conf 70%

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extends → Puter has compiled the entire Firefox browser to WebAssembly, so the whole browser runs inside another browser.Simon Willison · Simon Willison's Weblog