Next Mythos-Class Model released by…?

Platform comparison

Market context

Anthropic’s June release of Claude Fable 5 set the reference point for this market: the firm has already shown a willingness to add a new top-tier model and make it broadly available, then keep iterating on access and deployment within weeks rather than quarters. The current 0% crowd-implied probability leaves little room for a surprise launch before the 1 October settlement cut-off, but it also reflects that the contract needs a public release, not just an internal preview or restricted access rollout.[1][2]

The nearest comparable sequence is the June 2026 launch pattern, when Fable 5 arrived first and Sonnet 5 followed on 30 June, indicating that Anthropic can move from one flagship release to the next quickly once a model is ready.[1][6] For settlement, the key question is whether any successor is officially named as Mythos-class, or is described by Anthropic in those terms, and is made publicly accessible via the app, API, or an open beta/open rollout before the deadline.[1][13]

For traders, the main catalysts are official Anthropic announcements, release notes, and any change in availability wording on Claude’s product pages. On the crypto side, the contract settles in USDC, so on-chain liquidity and stablecoin transfer conditions matter more at expiry than directional BTC or ETH moves, though broad risk appetite can still affect prediction-market pricing; recent crypto derivatives data showed ETH funding turning positive while BTC stayed neutral, a sign that leverage can shift quickly across majors.[10][12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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%.