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Anthropic unveils Claude 3.7 Sonnet with hybrid reasoning

The new AI model offers instant and thoughtful responses, as well as a visible notebook feature

Eleni Karasidi
Eleni Karasidi
Published: 25.02.2025
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Anthropic has introduced a new generative AI model — Claude 3.7 Sonnet, described as the industry’s first “hybrid reasoning model.” This model can provide both instant answers and more thoughtful, step-by-step responses, depending on user needs. The new release is already available to all users and developers, but only premium plan subscribers will have access to the reasoning features. The cost of using Claude 3.7 Sonnet is three dollars per million input tokens and fifteen dollars per million output tokens.

Introducing Claude 3.7 Sonnet: our most intelligent model to date. It's a hybrid reasoning model, producing near-instant responses or extended, step-by-step thinking.

One model, two ways to think.

We’re also releasing an agentic coding tool: Claude Code. pic.twitter.com/jt7qQmFWuC

— Anthropic (@AnthropicAI) February 24, 2025

Claude 3.7 Sonnet stands out for its improved performance in real-world tasks, such as complex coding challenges. The model also features a “visible notebook” that allows users to observe the reasoning process. This ensures transparency, although some parts may be hidden for safety reasons. Additionally, Anthropic claims the new model is 45% less likely to refuse to answer requests compared to its predecessor, Claude 3.5 Sonnet.

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In addition to Claude 3.7 Sonnet, Anthropic is launching a new developer tool called Claude Code. This tool enables automation of software development processes, such as reading and editing code, running tests, and managing repositories on GitHub, directly from the terminal. Claude Code is currently available in a limited research mode, and the company plans to gradually expand its availability.

The launch of Claude 3.7 Sonnet comes amid rapid advances in AI technology, but Anthropic is focusing on the safety and reliability of its products. The company has taken steps to reduce risks such as prompt injection attacks and has improved the model’s ability to distinguish harmful requests from safe ones. This release highlights Anthropic’s commitment to creating AI systems that enhance human capabilities across various fields.

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