Following a March 2026 data leak revealing the existence of “Claude Mythos” — reportedly Anthropic’s most advanced model to date with major breakthroughs in reasoning, coding, and cybersecurity — speculation has grown around its potential public release. Now said to be in early access testing, the question is whether this next-generation model will make it out to the public before the end of June. Will Claude Mythos be released in time?

Market Dates:

• Market Period: From the publication date through June 30, 2026, at 11:59 PM ET.
• Market Close: June 30, 2026, at 11:59 PM ET.
• Resolution Time: July 1, 2026, or earlier if an outcome is reached.

Resolution Criteria:

• Resolves to “Yes” if Anthropic releases a qualifying model and makes it publicly accessible at any point during the Market Period.
• Resolves to “No” otherwise.

Qualifying Model Definition:

A model will qualify if:

• It is explicitly named “Claude Mythos” (e.g., Claude Mythos 1, Mythos X, Mythos 5), OR
• It is confirmed to be the same model referenced in the March 26, 2026 leak by:
  • Anthropic directly, or
  • A consensus of credible reporting.

The following do NOT qualify unless explicitly confirmed as the same model:

• Claude Haiku
• Claude Sonnet
• Claude Opus (including version iterations such as 4.7, 5.0, etc.)

Public Accessibility Requirement:

For a “Yes” resolution, the qualifying model must be:

• Available to the general public, including:
  • Open beta access
  • Open waitlist or rolling signups
• Not restricted to private or closed beta access

The release must be:

• Clearly announced by Anthropic, and
• Accessible through official channels (e.g., Anthropic website or product interfaces).

If a qualifying model appears on official platforms:

• It will count as “publicly announced” only if it is actually accessible under the rules above.
• Labeling errors, placeholders, or inaccessible listings will not qualify.

Resolution Details:

• The primary resolution source will be official communications from Anthropic, including:
  • Official website updates
  • Product releases
  • Press announcements
• A consensus of credible reporting from Reuters, Bloomberg and Associated Press may be used if needed.

Cancellation Conditions:

• Official information from Anthropic is unavailable, unclear, or contradictory, making it impossible to determine whether a qualifying model was publicly released.
• No consensus can be reached from credible reporting sources regarding whether the qualifying model meets the defined criteria.
• Any circumstance prevents reliable verification of public accessibility of the qualifying model during the Market Period.

If the market is cancelled, participants can claim their stakes at the then-current market value of their shares, which could result in a profit or a loss depending on the price of those shares at cancellation.