Next Claude Sonnet released by 2026?

Platform comparison

Market context

The real-world event is whether Anthropic will publicly launch its next model explicitly named Sonnet before the settlement deadline of 31 July 2026. With the crowd-implied probability sitting at 87% for a "Yes", the consensus heavily favours an imminent release, treating the timeline as a near-certainty. However, value spots may exist for contrarian traders betting on a delay, as the 87% figure assumes a smooth execution that history does not always guarantee.

Historical release patterns show Anthropic typically spaces major Sonnet updates by roughly six to eight months, with Claude 3.5 Sonnet launching in June 2024 and Claude 3.7 Sonnet arriving in February 2025[1]. Yet, the recent deprecation of the original Sonnet 4 and Opus 4 on 15 June 2026 suggests a transitional phase rather than a guaranteed new launch window[4]. While some speculate Claude 5 could emerge in early 2026, the timeline has been volatile, with the latest major release being Opus 4.8 in May 2026, not a Sonnet variant[3]. This gap between the latest Opus and the required Sonnet launch introduces uncertainty that the 87% price may be overlooking.

Traders must watch for official announcements regarding a Sonnet 5 or 4.7, particularly given the tight schedule before the July deadline. The release of Claude Fable 5 in June 2026 indicates active development, but Fable is not a qualifying Sonnet model[6]. A key dependency is whether Anthropic will prioritise a Sonnet update over further Opus iterations, as recent news confirms Opus 4.8's release just weeks ago[3]. Without a concrete announcement from Anthropic confirming a Sonnet launch date, the high probability remains speculative, leaving room for the underdog to win if the company delays the rollout.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.