Via cnet.com
Prediction market volumes top $233K as bettors track Anthropic's frontier AI release cadence
Prediction markets are not always right, but they are rarely quiet. Polymarket traders have pushed the probability of Anthropic releasing its next Mythos-class AI model by September 9, 2026, to 74 percent, a number that reflects real money, real conviction, and a growing read on how quickly the frontier AI lab moves.
Trading volume on the “next Mythos-class model released by” contract family has crossed $233,000. The broader AI model race markets on Polymarket have pulled in more than $6 million in cumulative volume.
What the markets are actually pricing #
The September 9 contract sits at 74 percent, but that is just one data point in a cascade of related bets. The odds of a Mythos-class release by September 15 have reached 81 percent, and end-of-month estimates sit at 87 percent.
Beyond the near-term Mythos question, Polymarket traders are also eyeing Anthropic’s broader model lineup. A new Opus model arriving by December 31, 2026, carries 96 percent odds. A new Sonnet model by the same date sits at 85 percent.
The baseline for all of this optimism is concrete: Anthropic launched Claude Fable 5 and Claude Mythos 5 on June 9, 2026, following a limited preview that began in April. Mythos-class models sit at the top of Anthropic’s capability hierarchy, and the June release gave traders a timestamp to anchor their expectations about how long the next cycle would take.
Why Mythos-class models are a bigger deal than a version number #
Mythos-class models are Anthropic’s highest-capability tier, distinguished by advanced code reasoning and vulnerability detection at a scale that previous Claude iterations could not reach.
Through Project Glasswing partners, Mythos-class models identified more than 23,000 vulnerabilities. Initial access to these models was limited due to cybersecurity concerns, but expanded through Project Glasswing, which integrated safety measures for deployment. The expanded access through Project Glasswing represented a judgment that the safety scaffolding was solid enough to proceed.
What this means for the AI competitive landscape #
An 87 percent probability of a Mythos-class model before October implies traders believe Anthropic is keeping pace with or ahead of its own historical schedule. No formal announcement has come from the company confirming a September release, which means the market is pricing in pattern recognition rather than disclosed information.
The 96 percent odds on a new Opus model by year-end add another layer to this picture. Opus sits below Mythos in Anthropic’s capability hierarchy but above the mid-tier Sonnet class.
Prediction markets are not oracles. A 74 percent probability means a 26 percent chance the September 9 date passes without a release.
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