Prediction markets put the probability at 80%: Next Mythos-Class Model released by September 30, 2026. Currently, markets see this as likely (80% YES).
On June 9, 2026, Anthropic released Claude Fable 5, the first publicly available model in its Mythos class, shipping as the company's most capable widely released system and built for long-horizon agentic work. It was available the same day across the Claude API, AWS, and Microsoft Foundry, positioned as the public, guardrailed sibling of Mythos. Within three days, however, a United States government export directive temporarily forced Fable 5 back offline, complicating the timeline for when a next Mythos-class model released to the broader market would remain durably accessible. [InfoQ, Jun 15]
The release followed months of caution. When Anthropic debuted Claude Opus 4.8 on May 28, 2026, it continued to hold back Mythos after a preview surfaced cybersecurity concerns, granting access only to a small set of organizations under Project Glasswing. At the time, the company said it was "making swift progress" on safeguards and expected to bring Mythos-class models to all customers "in the coming weeks." Since Fable 5's suspension, Mythos 5 has been partially restored to over 100 US institutions, signaling that a next Mythos-class model released at full scale hinges on both safety validation and regulatory clearance. [StartupHub, May 28]
Attention now centers on the September 30, 2026 deadline. As of July 17, traders assigned 84% odds to a new Mythos-class model arriving by that date and 68% to Anthropic granting permanent paid-plan access to Fable 5, which had already seen its access window extended multiple times. The pressure is competitive as well as regulatory: OpenAI's GPT-5.6 Sol benchmarks close behind Fable 5 at a fraction of the cost, while Anthropic's rapid cadence — including Sonnet 5 on June 30 — keeps expectations high for another next Mythos-class model released before the quarter ends. [Proactive Investors, Jul 17]
Lower-volume market on Polymarket ($51K). Wider spreads expected — enter with limit orders and be aware of slippage risk. Currently 80c YES.
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