Anthropic: Claude Opus 4.5
Model Type
Proprietary Model
API access only
Recommended Use Cases
Text Generation
Try Claude Opus 4.5
This was the most intelligent model in the Claude family from Anthropic until the next version, Claude Opus 4.6, was released in February 2026.
Per Anthropic:
Claude Opus 4.5 is intelligent, efficient, and the best model in the world for coding, agents, and computer use. It's also meaningfully better at everyday tasks like deep research and working with slides and spreadsheets. Opus 4.5 is a step forward in what AI systems can do, and a preview of larger changes to how work gets done.
Key Capabilities
- Coding: State-of-the-art on SWE-bench Verified; leads across 7/8 programming languages on SWE-bench Multilingual
- Agents: Superior performance on long-horizon autonomous tasks
- Computer Use: Industry-leading performance on browser and desktop automation
- Safety: Most robustly aligned model Anthropic has released; hardest to trick with prompt injection attacks
Key Features
- Context Window: 200K tokens
- Extended Thinking: Hybrid reasoning with adjustable effort control
- Output Tokens: Up to 64K
Use Cases
- Complex AI agents and autonomous workflows
- Advanced coding projects and software development
- Deep research and agentic search
- Computer use and browser automation
- Long-horizon autonomous tasks