Claude Mythos released by…?

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Active sub-markets

Market context

Anthropic confirmed on 26 March 2026 that Claude Mythos, an unreleased model described in a data leak as a substantial capability jump in coding, reasoning, and cybersecurity tasks, has entered early access testing. The leak itself forced the company's hand in publicly acknowledging the project ahead of any planned announcement schedule. The resolution hinges on whether a formal release—or explicit confirmation that a released model is Mythos itself—occurs before 30 April 2026, a window of just over one month from the leak date.

Historical precedent suggests caution in betting against release timelines once a model reaches early access. OpenAI's GPT-4 was widely expected within months of initial hints; Anthropic's own Claude 3 family rolled out across three tiers (Opus, Sonnet, Haiku) within a compressed window in March 2024. However, early access does not guarantee public release on any fixed schedule. The 0% crowd probability on Polymarket reflects genuine uncertainty: Anthropic could extend testing, rebrand the model, or delay commercial availability beyond the April deadline. Kalshi and Smarkets have historically shown wider probability ranges on tech release dates than Polymarket's tighter liquidity, suggesting traders there may price in longer tail risk more explicitly.

Watch for official Anthropic announcements, API availability timelines, and statements from leadership regarding Mythos deployment. The company has not published a release date. Any blog post, press release, or developer documentation confirming Mythos as a distinct, released product would trigger resolution. Absence of announcement by late April would likely resolve the market to "No," though the definition's reliance on "confirmed to be the same model" creates interpretation risk that could delay settlement.

Methodology

We read Claude Mythos released by…? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Is this market available outside the US?

Polymarket Alternative 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.

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 does it cost to trade on Polymarket Alternative?

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

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within 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.