Claude Opus 4.5

Claude Opus 4.5 is Anthropic's flagship model for deep reasoning, coding, and long-horizon agents. It is the first version of the claude-opus line in the registry. It has a 200,000 token context window and a 64,000 token maximum output. Weights are not open. It supports reasoning mode and tool calling. It accepts image, PDF, and text inputs and returns text. Pricing starts at $0.71 per million input tokens and $3.57 per million output tokens, with cached input from $0.50 per million. It is served by 22 hosts.

First version of its line in the registry.

Range across the hosts that serve it: up to $6.00 per 1M input tokens.

• ·200k token context window
• ·64k token max output
• ·Reasoning mode for complex tasks
• ·Tool calling support
• ·Accepts image, PDF, and text

• Reach for it for deep reasoning tasks
• Reach for it for coding
• Reach for it for long-horizon agents
• Reach for it for processing images and PDFs

22 hosts serve this model at the price above · the maker's documentation

• 72026 in LLMs (so far)2026-09-28

1 signal of the archive mention this model, each scored against the published bar. This list is rebuilt from the archive at every build, so it cannot go stale.

The registry keeps the six most recent versions of a line. Older ones stay in the file and can be surfaced without a rebuild.

What is the context window?

The context window is 200,000 tokens.

What is the price?

Input from $0.71 per million tokens, output from $3.57 per million, cached input from $0.50.

Does it support tool calling?

Yes, it supports tool calling and reasoning mode.