Markets Bet 60% Chance Anthropic Mythos Drops Today

TLDR

• Polymarket traders price a 60% chance of a June 9 Claude Mythos release.
• Cumulative Polymarket odds rise to 92% for release by July 31.
• Kalshi’s “Before July 1” contract stands at 43% probability.
• Total prediction market volume exceeds $2.2 million across platforms.
• Anthropic restricted the Mythos preview to about 50 vetted partners.

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Prediction markets on Tuesday showed a 60% chance that Claude Mythos becomes public by June 9. Polymarket traders also priced a June 10 release at 19% while assigning 11% odds to no launch by June 30. Combined trading volume across related contracts has surpassed $2.2 million as rumors of an imminent rollout circulate online.

Anthropic Timeline Odds Diverge Across Platforms

Polymarket’s single-day contract placed a 60% probability on a June 9 release. In contrast, traders assigned 19% odds to June 10 and 11% to no release by June 30. That contract recorded $42,212 in trading volume by Tuesday morning.

A broader Polymarket market tracking cumulative odds showed higher confidence. Traders priced an 81% chance of release by June 10 and 86% by June 12. The probability rose to 89% by June 15 and 90% by June 30, while July 31 reached 92%, with $1,578,682 in volume.

Kalshi reflected lower expectations for a near-term launch. The “Before July 1, 2026” contract stood at 43% implied probability after a 30% confidence drop. Traders linked the decline to speculation that Anthropic may release the model under another name such as “Claude Fable.”

Kalshi’s broader “Before October 1” contract held at 73% probability. Total trading volume for that event reached $607,723. Together, prediction markets have accumulated more than $2.2 million tied to the Claude Mythos timeline.

Model Capabilities and Controlled Access

Anthropic introduced Claude Mythos Preview on April 7, 2026, and placed it above the Opus tier. The company restricted access to about 50 vetted partners at launch. Executives cited misuse risks, especially regarding cybersecurity capabilities.

According to a June 8 Axios report, the model can convert a new vulnerability into a working exploit in 31 minutes. Security researchers previously required weeks to complete similar tasks. Under Project Glasswing, partners reported identifying over 10,000 high or critical vulnerabilities between April and May.

Anthropic stated in a May 28 Reuters report that it planned to release Mythos “in the coming weeks.” The company also launched Claude Opus 4.8 as its flagship general-purpose model. A May 22 Project Glasswing update said the firm expects public release “once we’ve developed the far stronger safeguards we need.”

On June 1 and 2, Anthropic expanded Project Glasswing access to ENISA and about 150 organizations. These groups spanned more than 15 countries and included power, water, and healthcare operators. As of Tuesday morning, Anthropic’s newsroom and @AnthropicAI account showed no public release announcement.

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