Anthropic’s September 22 release of Claude Opus 5.5, paired with the explicit statement that Sonnet 5.5 and Haiku 5.5 will follow in the coming weeks, is the main catalyst behind the tightly clustered market odds around early October dates. The update cycle for the Sonnet family typically trails flagship launches by roughly three to four weeks, aligning trader consensus with historical patterns from Sonnet 5 and 4.6. Competitive pressure from OpenAI and Google on agentic coding, tool use, and cost-efficient performance at the mid-tier level adds urgency, yet the lack of a firm date or benchmark leaks keeps probabilities spread across multiple early-October outcomes rather than converging on one. Traders are pricing in both the “coming weeks” window and typical final testing or rollout buffers before a public launch.