Anthropic has announced the release of its “most intelligent model to day and the first hybrid reasoning model on the market,” Claude 3.7 Sonnet, as well as Claude Code.

Anthropic is one of the leading AI firms, founded by former OpenAI engineers who were concerned about the latter’s deviation from its original mission to develop AI safely. Anthropic has gone on to develop some of the most powerful AI models, its Claude line, continually challenging OpenAI for the honor of being the most powerful option available.

The company’s latest model, 3.7 Sonnet, is a significant step forward, taking an all-new approach to AI model design.

We’ve developed Claude 3.7 Sonnet with a different philosophy from other reasoning models on the market. Just as humans use a single brain for both quick responses and deep reflection, we believe reasoning should be an integrated capability of frontier models rather than a separate model entirely. This unified approach also creates a more seamless experience for users.

Anthropic goes on to highlight three specific ways this new approach pays off.

Claude 3.7 Sonnet embodies this philosophy in several ways. First, Claude 3.7 Sonnet is both an ordinary LLM and a reasoning model in one: you can pick when you want the model to answer normally and when you want it to think longer before answering. In the standard mode, Claude 3.7 Sonnet represents an upgraded version of Claude 3.5 Sonnet. In extended thinking mode, it self-reflects before answering, which improves its performance on math, physics, instruction-following, coding, and many other tasks. We generally find that prompting for the model works similarly in both modes.

Second, when using Claude 3.7 Sonnet through the API, users can also control the budget for thinking: you can tell Claude to think for no more than N tokens, for any value of N up to its output limit of 128K tokens. This allows you to trade off speed (and cost) for quality of answer.

Third, in developing our reasoning models, we’ve optimized somewhat less for math and computer science competition problems, and instead shifted focus towards real-world tasks that better reflect how businesses actually use LLMs.

Early testing shows Claude once again taking the lead in software engineering, beating out all of OpenAI’s current models, as well as DeepSeek R1.

Claude Code

In addition to Claude 3.7 Sonnet, Anthropic has released Claude Code, “a command line tool for agentic coding.”

Claude Code is an active collaborator that can search and read code, edit files, write and run tests, commit and push code to GitHub, and use command line tools—keeping you in the loop at every step.

Claude Code is an early product but has already become indispensable for our team, especially for test-driven development, debugging complex issues, and large-scale refactoring. In early testing, Claude Code completed tasks in a single pass that would normally take 45+ minutes of manual work, reducing development time and overhead.

The company plans to continue improving Claude Code in the coming weeks.

Per the company’s mission, the new models have undergone extensive safety checks, making significant improvements in that area as well.

We’ve conducted extensive testing and evaluation of Claude 3.7 Sonnet, working with external experts to ensure it meets our standards for security, safety, and reliability. Claude 3.7 Sonnet also makes more nuanced distinctions between harmful and benign requests, reducing unnecessary refusals by 45% compared to its predecessor.

Conclusion

Anthropic continues to establish itself as one of the leading AI firms, both in terms of innovation and ensuring safe development.

Users of Free, Pro, Team, and Enterprise plans can start using Claude 3.7 Sonnet immediately.