Anthropic’s September 22, 2026 launch of Claude Opus 5.5 at $4 input and $20 output per million tokens, a 20% cut from Opus 5 alongside 60% lower cache reads at $0.20, anchors current trader sentiment around further 2026 declines. The model delivers comparable frontier performance to higher-tier options like Fable 5.1 while using fewer tokens on agentic and coding workloads, yielding roughly 40% lower effective costs. Competitive pressure from OpenAI and Google Gemini price cuts, plus Anthropic’s pattern of holding $25 output rates across four prior 2026 Opus releases before this efficiency-driven adjustment, shapes expectations. Key upcoming catalysts include potential new model drops or batch/fast-mode expansions before year-end that could accelerate additional reductions in output token pricing.