Claude Opus 4.5 is Anthropic’s newest “Opus-class” model (released in late November 2025). It’s positioned as a top-tier model for professional software engineering, long-horizon agentic workflows, and high-stakes enterprise tasks, and Anthropic intentionally priced it to make high capability more accessible to production users. Below I unpack what the Claude Opus 4.5 API is, how […]
Anthropic released Claude Opus 4.5 in late November 2025 as a more capable, more efficient Opus-class model targeted at professional software engineering, agentic workflows, and long-horizon tasks. It’s available through Anthropic’s developer platform and via CometAPI and it introduces new API controls (notably the effort parameter), improved computer-use tooling, extended thinking, and token efficiency improvements […]
Claude Opus 4.5 positioned as a hybrid-reasoning, agent-oriented model optimized for long-horizon coding, complex office automation (Excel/PowerPoint automation), multi-tool agent workflows and long-context workflows. Claude Opus 4.5 emphasizes token efficiency, long-horizon coding and agentic tool use with an effort knob to tune tradeoffs; default 200K context with higher long-context options available
Model Type: Chat
