Mark Kretschmann(@mark_k):Claude Opus 5.5 is here. More capable, faster, and substantially cheaper. @AnthropicAI keeps pushing the economics of useful AI. According to Anthropic: • 40% lower costs on typical workloads than Opus 5. • Over 30% faster output. • 66.4% on Terminal-Bench 4.0, versus Opus 5’s 52.3% and GPT-6 Astra’s 57.9%. • Clearer writing and stronger performance on long, complex coding tasks. API pricing drops to $4/$20 per million input/output tokens. Pro, Max, and Team users also get higher five-hour limits, plus a rate-limit reset they can save for later. More work completed, less time waiting, lower bills.

2026.09.22 16:38

Claude Opus 5.5 is here. More capable, faster, and substantially cheaper. @AnthropicAI keeps pushing the economics of useful AI. According to Anthropic: • 40% lower costs on typical workloads than Opus 5. • Over 30% faster output. • 66.4% on Terminal-Bench 4.0, versus Opus 5’s 52.3% and GPT-6 Astra’s 57.9%. • Clearer writing and stronger performance on long, complex coding tasks. API pricing drops to $4/$20 per million input/output tokens. Pro, Max, and Team users also get higher five-hour limits, plus a rate-limit reset they can save for later. More work completed, less time waiting, lower bills.