Claude Opus 4
by Anthropic
World's best coding model released May 2025, leading SWE-bench at 72.5% and Terminal-bench at 43.2%. Designed for sustained performance on complex long-running tasks requiring thousands of steps and several hours of continuous work.
- World's best coding model with sustained performance on complex tasks requiring thousands of steps
- Continuous operation capability working for several hours on long-running agent workflows
- Leading performance on SWE-bench (72.5%) and Terminal-bench (43.2%) coding benchmarks
- Enhanced memory capabilities with improved file access and tacit knowledge building
- Frontier agent performance powering complex codebase understanding and autonomous development
Web Search
Search the web for current info.
Extended Thinking
Enhanced reasoning for complex tasks.
Web Fetch
Fetch and read full content from any URL.
Code Execution
Run Python & Bash code in a sandbox.
JSON Mode
Output responses in valid JSON format.
Model Information
Supported Formats
Claude Opus 4.8Anthropic's most capable model released May 2026. Hybrid reasoning model with a 1M token context window, stronger across coding, agentic tasks, and professional work over Opus 4.7. Features adaptive thinking via the effort parameter (defaults to high). Knowledge cutoff January 2026.
Claude Opus 4.7Anthropic's most capable generally available model with a step-change improvement in agentic coding over Claude Opus 4.6. Features 1M token context window, 128K max output, and adaptive thinking. Knowledge cutoff January 2026.
Claude Opus 4.6Anthropic's most intelligent model released February 2026. Features 1M token context window and 128K max output. Built for deep reasoning, long-horizon agentic tasks, and complex multi-step coding workflows. Supports extended thinking and adaptive thinking modes.