Next Claude Sonnet released by 2026?

Platform comparison

Market context

Anthropic must launch its next Claude Sonnet model to the general public before the end of July 2026, a deadline that currently commands a 79% implied probability of success. This threshold sits notably higher than the cautious first-quarter 2026 forecasts circulating among community analysts, who previously predicted a February or March arrival for Claude 5. The divergence suggests the market is pricing in a faster cadence than historical patterns alone would justify, particularly given the rapid iteration seen since the 3.5 family.

Historical release cycles frame this optimism: Claude 3.5 Sonnet arrived in June 2024, followed by 3.7 Sonnet in February 2025, establishing a rhythm of roughly eight-month gaps between major Sonnet updates. However, the recent deprecation of Sonnet 4 and Opus 4 on 15 June 2026 creates urgent pressure for a replacement, as production applications relying on pinned API identifiers will fail without migration[4]. This technical dependency acts as a potent catalyst, potentially accelerating a Sonnet 5 launch to fill the void left by the retired models.

Traders should monitor Anthropic’s official announcements for any Sonnet variant release, especially following the May 28 launch of Opus 4.8, which targeted coding and agentic tasks[3]. While Fable 5 became generally available on 9 June 2026, it does not qualify as a Sonnet model[5]. The critical signal will be an explicit naming of a Sonnet variant, as models like Opus, Haiku, or Fable are excluded unless officially branded Sonnet by the company. Any delay beyond the current deprecation window would sharply reduce the probability of a timely public release.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.