Claude Mythos 5 access restored by…?

Platform comparison

Market context

In April 2026, Anthropic launched the cybersecurity-focused model "Claude Mythos 5" under its Project Glasswing programme, only for the US government to suspend all access on June 12 due to national security export controls. By late June, restrictions were partially lifted for US organisations, and on July 1, full access to both Mythos 5 and Fable 5 was restored on AWS and other platforms, confirming the suspension was temporary and resolved.

Historical precedents show that when US export directives target specific AI models, access is typically reinstated once the Department of Commerce clarifies compliance pathways—exactly as occurred here. This explains the current 0% crowd-implied probability on Polymarket: the event has already happened, making a "Yes" outcome impossible. Platforms diverge sharply here; Polymarket displays decimal odds (1.00 for "No"), while Kalshi and Betfair use implied probabilities and require KYC, whereas Smarkets offers fee-free betting but lower liquidity for such settled events.

Traders should monitor official Anthropic announcements and AWS update logs for any future model revisions, though no catalyst remains for this specific market. A recent Reuters report confirmed the US government’s directive was lifted on June 30, with restoration commencing the following day [5]. Since access is already active, no further action is needed, and the market will resolve "No" by the settlement deadline of 30 June 2026.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Claude Mythos 5 access restored 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 mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.