Anthropic Launches Claude Opus 5.5: 1M Token Context Window, 20% Cost Reduction and 30% Speed Boost Over Opus 5
Anthropic launched Claude Opus 5.5 on September 22, 2026, featuring a 1M token context window and 128K max output. Compared to Opus 5, typical workload costs drop 40%, speed improves 30%+, input pricing falls to $4/million tokens, and cache reads drop 60%. The model is immediately available on Claude API, Amazon Bedrock, Google Cloud, and Azure.