Next Mythos-Class Model released by…?

Platform comparison

Market context

Anthropic has already shown how it handles this ladder: on 9 June 2026 it launched Claude Fable 5 as a Mythos-class model for general use, while the closely related Claude Mythos 5 remained restricted to approved users through Project Glasswing. In prediction markets, a YES share pays out if the named event happens; a NO share pays if it does not, so the current 0% implied probability suggests the market is treating another public Mythos-class release before 1 October as very unlikely.

That reading is easier to understand against the recent release pattern. Anthropic moved from a previously previewed Mythos line to a public Fable launch, then kept the higher-access Mythos 5 variant gated, which means the key issue is not whether the capability exists, but whether Anthropic chooses to repackage or expand access again before the deadline. Recent Anthropic release notes also show ongoing product maintenance around Fable 5 in August, which points to active support rather than an obvious new public model cycle.

The main catalysts are a fresh product announcement, any update to Anthropic’s newsroom or model pages, and changes to access rules for partner programmes such as Project Glasswing. Traders should also watch for signs of a new naming step, because the market resolves only if Anthropic releases the next model it officially describes as Mythos-class, or uses “Mythos” in the name, and makes it publicly accessible by 1 October. If Anthropic only widens restricted access without a qualifying public launch, that would still count as a NO.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

UK Frequently Asked Questions

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.