Claude 4

Claude 4 introduces Anthropic's latest advancements in AI through two state-of-the-art models: Claude Opus 4 and Claude Sonnet 4. These models set new benchmarks in coding, reasoning, and agentic tasks, offering groundbreaking capabilities for developers, researchers, and enterprises.

Claude Opus 4 is positioned as the world's most advanced coding model, excelling in complex, long-running tasks and delivering sustained performance over extended workflows. It performs exceptionally well on coding benchmarks like SWE-bench (72.5%) and Terminal-bench (43.2%), making it a leader in software engineering tasks. The model is particularly adept at understanding and modifying complex codebases, solving multi-step problems, and maintaining high reliability during editing and debugging. Its enhanced memory capabilities allow it to create and utilize "memory files" when given access to local files, enabling superior task continuity and coherence.

Claude Sonnet 4 builds upon its predecessor, Claude Sonnet 3.7, delivering a balanced mix of performance and efficiency. It achieves a state-of-the-art 72.7% on SWE-bench and demonstrates improved steerability, making it ideal for a wide range of internal and external applications. While it does not match Opus 4 in raw capability, Sonnet 4 is optimized for practical use cases, offering enhanced problem-solving, code navigation, and multi-feature app development.

Both models feature extended thinking capabilities, allowing them to alternate between reasoning and tool use, such as web search, for more accurate and contextually relevant responses. They also support parallel tool execution and demonstrate significantly improved memory retention, enabling better continuity in long-term tasks. Safety measures have been enhanced to reduce reliance on shortcuts or loopholes, improving reliability across agentic tasks.

Developers can integrate these models into their workflows via the Anthropic API, Amazon Bedrock, and Google Cloud's Vertex AI. Pricing remains consistent with previous iterations, with Opus 4 and Sonnet 4 available across various subscription plans, including free-tier access for Sonnet 4. Additionally, Claude Code, now generally available, integrates seamlessly into popular IDEs like VS Code and JetBrains, enabling inline code edits and background tasks through GitHub Actions.

These models represent a significant leap in AI capabilities, empowering users to tackle complex challenges in coding, research, writing, and beyond, while maintaining a strong focus on safety, memory, and extended reasoning.