Next Claude Sonnet released by 2026?

Platform comparison

Market context

Anthropic must launch its next Claude Sonnet model to the general public before 31 July 2026, a deadline that currently carries a 94% implied probability of success across prediction markets. This high confidence stems from the company’s recent cadence: Claude 3.5 Sonnet arrived in June 2024, Claude 3.7 Sonnet in February 2025, and the latest major release, Claude Opus 4.8, came in May 2026 [1][3]. The deprecation of Sonnet 4 and Opus 4 on 15 June 2026 further pressures Anthropic to replace them with a new Sonnet variant, making a public launch before the settlement window highly plausible [4].

Traders should monitor official announcements from Anthropic’s transparency hub and developer channels, particularly any mention of Sonnet 4.6 or 5.0 with a May 2025 knowledge cutoff or later [9]. The release of Claude Fable 5 in June 2026 suggests a broader 2026 rollout strategy, potentially including a Sonnet update [6]. While Reddit speculation points to a January 2026 Sonnet 5 release, the rapid pace of development could accelerate this timeline [2]. On platforms like Polymarket versus Kalshi or Betfair, divergence arises in how odds are framed—decimal versus implied probability—and in fee structures, KYC requirements, and liquidity depth, which affect how this 94% probability is priced and traded across markets.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Next Claude Sonnet released by 2026? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

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

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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

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.