Anthropic’s Fable series of large language models drives the current market-implied odds, with Fable 5 launching in June 2026 and the minor Fable 5.1 update arriving September 1. Traders see a roughly quarterly cadence continuing, pushing strong consensus toward a 5.2+ release before year-end as the company iterates on coding, interactive scene generation, and long-horizon agentic tasks. No official announcement has surfaced in recent weeks, though leaks and Azure catalog sightings have fueled speculation without confirmed timelines or benchmarks. Competitive pressure from OpenAI’s GPT-6 line and Chinese models like GLM-5.2 adds urgency, while historical release patterns and internal training progress support the elevated probabilities for November or December availability.