Anthropic

Claude Opus 5.5 Economy provides an ultra-low-cost deployment channel for Anthropic's premier Claude Opus 5.5 model architecture. Engineered to handle sustained agentic coding runs, automated multi-step tool execution, and extended long-context analytical tasks, this Economy channel is specifically optimized for maximum budget efficiency. While retaining the underlying reasoning power, adaptive thinking depth, and 1M token context capacity of Opus 5.5, it operates with dynamic stability limits and lower concurrency priority compared to the standard Official channel.

Claude Fable 5.1 is Anthropic's upgraded flagship frontier model engineered for high-complexity software development, long-horizon agentic workflows, and multi-step knowledge work. Built on Mythos-tier reasoning, Fable 5.1 significantly enhances autonomous self-verification and root-cause troubleshooting while reducing safety false-positive interventions by up to 60%. Powered by an optimized prompt-caching architecture featuring a 75% reduction in cache-read pricing, it cuts total operating costs by 25% to 45% for highly agentic tasks.

Claude Opus 5 is Anthropic's ultra-flagship frontier model engineered for extreme cognitive density, deep logical reasoning, and expert-level scientific synthesis. Powered by native adaptive thinking and a 1-million-token context window, it resolves complex multi-step mathematical, architectural, and coding challenges with unprecedented accuracy and near-zero hallucination rates. Coupled with rigorous enterprise safety alignment, Claude Opus 5 excels at high-stakes operations, including legal compliance, quantitative financial modeling, advanced biosecurity research, and mission-critical software architecture auditing.