Claude Mythos released by…?

Platform comparison

Active sub-markets

Market context

Anthropic confirmed on 26 March 2026 that a data leak had exposed details of an unreleased model called Claude Mythos, described internally as a significant capability step forward in coding, reasoning, and cybersecurity tasks. The company acknowledged the model exists and is undergoing early access testing, though no public release date has been announced. This market resolves affirmatively if Anthropic releases Claude Mythos or explicitly confirms that a released model is the same system referenced in the leak.

Historical precedent suggests caution in assuming leaked models reach public availability on any given timeline. OpenAI's GPT-4 was widely discussed in leaked form months before official release in March 2023; similarly, details of Gemini circulated internally at Google for extended periods before staged public rollout. Anthropic's pattern favours measured release cadences tied to safety evaluation completion rather than market pressure. The 0% crowd probability reflects scepticism that a full commercial or public release occurs by 30 April 2026—roughly thirteen months from the leak date—though early access programmes can blur definitional lines around "release."

Traders should monitor Anthropic's official announcements regarding Claude Mythos availability, any regulatory filings disclosing commercial launch timelines, and statements clarifying whether early access constitutes settlement-qualifying release. The company typically telegraphs major model releases through blog posts and API documentation updates. UK traders should note that prediction market positions under £1,500 notional value generally fall outside FCA KYC requirements under gambling exemptions, whilst German participants face GlüStV licensing considerations depending on position size and residency classification. US CFTC jurisdiction over binary derivatives remains unsettled for offshore platforms, affecting settlement certainty for American participants.

Methodology

We track Claude Mythos released by…? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Tax UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Tax UK triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.