Claude 3.7 Sonnet: How to Access and Use It

Claude 3.7 Sonnet is one of the latest AI models you can use. It’s the next iteration in the Claude 3 series, bringing faster, sharper, and more capable performance.

Anthropic has been steadily refining its models, optimizing them to stay at the top of the AI game. And with Claude 3.7 Sonnet, they’ve packed in some serious upgrades. It’s not just another step forward—it’s a major leap in speed, accuracy, and reasoning.

Now, you might see the version number and think, 3.5 to 3.7? That’s not a huge jump, right? Don’t let that fool you. The improvements baked into this model are far more significant than the numbers suggest.

So, what exactly is Claude 3.7 Sonnet? How does it compare to previous versions? And, most importantly, how can you start using it today?

Let’s break it all down.

What is Claude 3.7 Sonnet?

AI is shifting. It’s no longer just about responding quickly; it’s about thinking through problems step by step. OpenAI’s O1 and O3 series, DeepSeek’s R1, and Grok 3 have all pushed AI toward deeper reasoning

With Claude 3.7 Sonnet, we’re seeing one of Anthropic’s first serious push into reasoning models. It’s Anthropic’s answer to the rise of reasoning models.

What’s New in Claude 3.7 Sonnet?

Thinking Mode: This is Claude’s attempt at structured reasoning. Instead of jumping straight to an answer, it takes a moment to break down its thought process, ensuring more accurate responses—especially in complex problem-solving.
Hybrid Processing: Claude 3.7 can switch between reasoning mode and generalized mode.. When deep reasoning isn't necessary, it defaults to a faster, more fluid response style—striking a balance between speed and accuracy.
A True Reasoning Contender: Benchmarks show that Claude 3.7 Sonnet competes directly with OpenAI’s O3 Mini, DeepSeek R1, and Grok 3. In real-world use, this means better logical reasoning, improved multi-step thinking, and sharper problem-solving skills.
Faster and More Capable: Beyond reasoning, Claude 3.7 also writes better, codes smarter, and understands context more effectively than its predecessors.

With a stronger focus on reasoning, better writing and coding, and the ability to switch between fast responses and deep thinking, Claude 3.7 Sonnet is one of the most refined AI models available today.

Now, how do you actually get access to it?

How to Access Claude 3.7 Sonnet

Claude 3.7 Sonnet is available through multiple access points, depending on how you want to use it. Whether you’re looking for casual interaction or full-scale API integration, here’s where you can find it:

1. Claude.ai (Chat Interface) – The Easiest Way

If you just want to chat with Claude 3.7 Sonnet, head over to Claude.ai.

Free Users: Get access to Claude 3.5 but not 3.7.
Claude Pro Users ($20/month): Unlock Claude 3.7 Sonnet along with faster response times and higher rate limits.

2. Claude API – For Developers & Businesses

Want to integrate Claude 3.7 Sonnet into your app or workflow? The Claude API (via Anthropic’s developer platform) gives you full access, including:

Claude 3.7 Sonnet for advanced responses
Thinking Mode for deep reasoning
Higher usage limits for large-scale applications

Check out Anthropic’s API docs to get started.

3. Chatbase – Use Claude 3.7 in a Conversational AI

If you want to build a RAG-powered conversational AI tools using Claude 3.7, but don’t want to mess with APIs directly; Chatbase makes it plug-and-play. Just upload your docs, tweak your conversational AI agent personality, and let Claude 3.7 handle the responses.

No coding required
Much faster setup than building from scratch with the API

You can try Claude 3.7 Sonnet on Chatbase right now—just sign up and choose Claude 3.7 as your conversational AI agent model.

Try Claude 3.7 Sonnet on Chatbase now →

What’s the Best Way to Access It?

Casual user? Try Claude.ai (but you’ll need Pro for 3.7).
Building a conversational AI tool like an AI agent or a chatbot? Chatbase lets you build with Claude 3.7 with little to no coding.
Developer that wants to build from scratch? Claude API gives full access.
Want alternatives for casual users? Check Poe.com.

The Evolution of Claude: A Timeline of Major Releases

Claude’s journey has been fast, iterative, and packed with upgrades. With every version, Anthropic has been refining its AI to be faster, smarter, and more reliable—and now, with Claude 3.7 Sonnet, it's making a serious push into the reasoning-model space.

Let’s break down how we got here.

Claude 1 (March 2023) – The Debut Model

Anthropic introduced Claude 1, a reliable but relatively conversational model, optimized for safety and helpfulness.
While it wasn’t the most powerful LLM at the time, it stood out for its low hallucination rate and aligned responses.

Claude 2 (July 2023) – A Major Upgrade

Longer context window: Boosted from 9K tokens to 100K—a game-changer for processing long documents.
Improved reasoning & writing: More structured responses and better summarization.
Still conservative: Stuck to Anthropic’s safety-first approach, sometimes refusing to answer when GPT-4 would.

Claude 3 (March 2024) – The Big Leap

Three versions: Haiku (fastest), Sonnet (balanced), Opus (most powerful).
Massively improved reasoning, math, and coding.
Vision capabilities introduced, making it one of the best AI models for image analysis.
Started competing directly with GPT-4 Turbo & Gemini 1.5.

Claude 3.5 Sonnet (June 2024) – The Unexpected Mid-Year Update

Faster and sharper: Claude 3.5 Sonnet was surprisingly stronger than GPT-4 Turbo in many benchmarks.
Still no Thinking Mode, but better at handling complex, multi-step reasoning than previous versions.
Cheaper API pricing, making it more accessible for developers.

Claude 3.7 Sonnet (February 2025) – The "Thinking Model" Era

Anthropic’s first true reasoning model.
Thinking Mode introduced
Stronger competitor to OpenAI’s O3 Mini, DeepSeek R1, and Grok-3.

Where Does This Put Claude?

Claude has evolved from just “a safe, reliable assistant” to a top-tier AI model competing in deep reasoning. With 3.7 Sonnet, Anthropic is not just playing catch-up—it’s actively shaping the future of AI-driven problem-solving.

Skip the complexity—plug in your data, let ChatBase handle the RAG, and start using a fully customized Claude 3.7 chatbot today.

Try Claude 3.7 Sonnet on Chatbase now →