Anthropic’s release of Claude Opus 5.5 on September 22 drives current trader consensus, following the July launch of Opus 5 and a pattern of roughly three-week Opus updates amid competition from OpenAI’s GPT series and internal Fable/Mythos variants. The new model delivers performance close to frontier offerings like Fable 5.1 at 40% lower cost, faster output, clearer writing, and stronger safety results, including an 85% reduction in containment bypass attempts. It is priced at $4/$20 per million input/output tokens and available immediately via major cloud platforms. Sonnet 5.5 and Haiku 5.5 are slated for the coming weeks, while historical release intervals point to a potential next Opus iteration around mid-October. These confirmed announcements and ongoing frontier-lab pressure explain the market’s heavy weighting toward the most recent date.