Anthropic: Claude Opus 4.6 API
Released on February 5, 2026, Claude Opus 4.6 is Anthropic's frontier model optimized for complex enterprise workflows and high-stakes knowledge work. As a direct successor to Opus 4.5, it introduces a massive 1 million token context window. It is designed to act as an autonomous agent that "nails deliverables on the first try," significantly reducing the need for iterative prompting. Opus 4.6 excels in "Computer Use," long-horizon coding (reigning atop Terminal-Bench 2.0), and professional-grade cybersecurity analysis.
- Context window: 1,000,000 tokens
- Max output: 128,000 tokens
- Input: text, image
- Output: text
- Reasoning: Supported
- Tool calling: Supported
- File input: Supported
- Released: 2026-02-04
- Knowledge cutoff: 2025-11-30
Frequently Asked Questions
What is the context window of Claude Opus 4.6?
Claude Opus 4.6 supports a context window of up to 1,000,000 tokens.
Does Claude Opus 4.6 support function calling?
Yes. Claude Opus 4.6 supports tool / function calling.
Does Claude Opus 4.6 support reasoning?
Yes. Claude Opus 4.6 is a reasoning-capable model.
What is the knowledge cutoff of Claude Opus 4.6?
The knowledge cutoff of Claude Opus 4.6 is 2025-11-30.