Claude Mythos released by…?

Platform comparison

Active sub-markets

Market context

On 26 March 2026, a data breach exposed Anthropic's internal development of "Claude Mythos," a model the company subsequently confirmed exists and is undergoing early access testing. The leak detailed claimed advances in coding, reasoning, and cybersecurity capabilities beyond current Claude releases. Anthropic has not yet announced a public release date or commercial availability window. The market resolves affirmatively only if Anthropic formally releases Claude Mythos or explicitly confirms that a released model is identical to the leaked version, with settlement occurring by 30 April 2026.

Comparable precedent exists in prior AI model release timelines: OpenAI's GPT-4 was announced in March 2023 and released within weeks; Anthropic's Claude 3 family was announced and released in early March 2024 with minimal delay between confirmation and availability. However, early access testing phases can extend considerably—some models remain in restricted beta for months before general release. The 0% crowd probability reflects genuine uncertainty about whether Anthropic will move from testing to public release within a compressed four-week window, particularly given the reputational sensitivity surrounding the leak itself.

Key catalysts include any official Anthropic announcement regarding Claude Mythos availability, scheduled product launches, or earnings calls where release timelines might be disclosed. Traders should monitor Anthropic's official channels and technology press for release confirmations. From a market accessibility standpoint, this contract sits below the £1,200 (approximately $1,500 USD equivalent) no-KYC threshold applicable under UK regulations and German GlüStV provisions, meaning participation does not trigger enhanced customer due diligence requirements on polymarket-kyc.co.uk. US CFTC reach applies to US-domiciled traders regardless of contract size.

Methodology

This page reviews Claude Mythos released by…? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket KYC UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 KYC 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 KYC 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.