Claude Mythos released by…?

Platform comparison

Active sub-markets

Market context

Anthropic confirmed on 26 March 2026 that Claude Mythos, an unreleased model exposed through a data breach, exists and is undergoing early access testing. The leak described the system as a significant capability step forward, particularly in coding, reasoning, and cybersecurity domains. Polymarket currently prices the conditional token for Mythos's public release at 0%, reflecting either extreme scepticism about launch timing before 30 April 2026 or trader conviction that the leaked model will be rebranded, integrated into existing Claude versions, or shelved entirely rather than released as a distinct product.

Historical precedent suggests caution about reading zero-probability markets literally. OpenAI's GPT-4 was extensively leaked months before official release, yet still launched under its original name. Anthropic's own Claude 3 family arrived within announced windows despite pre-release information circulating. However, the company's pattern of measured rollouts—Claude 3 Opus took months to reach general availability after initial access—means a 30 April deadline leaves minimal runway for a full public launch following early testing.

Traders should monitor Anthropic's official announcements, particularly any statement clarifying whether Mythos represents a distinct product line or feeds into Claude 4 or successor numbering. The company's next scheduled product communication, earnings calls, or developer conference appearances before month-end will signal intent. Absence of launch announcements by mid-April would effectively close the YES case, as enterprise and consumer rollouts typically require at least two weeks' notice for infrastructure scaling.

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

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.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket 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.

Is this market available outside the US?

Polymarket UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What does it cost to trade on Polymarket UK?

Zero. Polymarket UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket 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.