Claude Opus 4.8

Claude Opus 4.8 is Anthropic's top Claude Opus tier, designed for the hardest reasoning, coding, and long-horizon agents. It is the latest model in the claude-opus line, released on 2026-05-28. It has a context window of 1,000,000 tokens and a maximum output of 128,000 tokens. The weights are not open. It supports reasoning mode, tool calling, and accepts image, PDF, and text inputs, returning text. Pricing starts at $0.425 per million input tokens and $2.12 per million output tokens, with cached input at $0.15 per million tokens.

Against Claude Opus 4.7: input $5.00 to $0.425, output $25.00 to $2.13, cached input $0.50 to $0.15.

Range across the hosts that serve it: up to $12.00 per 1M input tokens.

• ·1,000,000-token context window
• ·128,000-token max output
• ·Reasoning mode for complex tasks
• ·Tool calling for agent workflows
• ·Accepts image, PDF, and text inputs

• Reach for it for hardest reasoning problems
• Reach for it for complex coding tasks
• Reach for it for long-horizon agent workflows
• Reach for it for processing large documents with image and PDF support

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

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 1,000,000 tokens.

Does it support tool calling?

Yes, it supports tool calling and reasoning mode.

What is the pricing?

Input from $0.425 per million tokens, output from $2.12 per million, cached input from $0.15 per million.