"Anthropic’s new Claude Sonnet 4.5 can code for 30+ hours straight, build full applications, and power enterprise AI workflows with unmatched reliability."
Anthropic has just launched Claude Sonnet 4.5, its most advanced AI model yet, designed to transform how developers build software, agents, and enterprise-ready solutions. Unlike previous versions, Sonnet 4.5 focuses on autonomous coding, agentic workflows, and long-running projects, making it a game-changer for tech teams and startups worldwide.
What makes Claude Sonnet 4.5 special?
The standout ability of Claude Sonnet 4.5 is its extended autonomous coding power. It can work on a project for more than 30 hours without losing focus or context, producing thousands of lines of code in a single run. Imagine building an entire chat application with 11,000 lines of code - Sonnet 4.5 can handle it.
Key Features at a Glance
| Feature | What It Means |
|---|---|
| Extended Coding Sessions | 30+ hours of uninterrupted coding |
| Benchmark Leader | 77.2% on SWE-Bench Verified, top in OSWorld |
| Agentic Intelligence | Manages multi-step workflows and tools |
| Enterprise Security | Safer operations, reduced prompt injection risks |
| Developer Tools | VS Code extension, Claude API, checkpoints |
How does it perform in benchmarks?
Claude Sonnet 4.5 achieves state-of-the-art results on coding and reasoning benchmarks. On SWE-Bench Verified, it scores 77.2%, outperforming older models and competitors. For computer interaction, it leads the OSWorld benchmark with 61.4%, a big jump from the previous 42.2%.
Why does it matter for developers?
Sonnet 4.5 is not just about raw power. It is engineered for agentic intelligence, meaning it can run multi-step workflows, use tools, remember context across conversations, and help teams manage complex projects. Anthropic’s Claude Agent SDK lets developers build their own autonomous agents on top of this model.
Stronger security and safer AI
Anthropic has worked hard on safety. Claude Sonnet 4.5 reduces sycophancy, deception, and vulnerability to prompt injection. It also follows instructions more reliably, making it suitable for enterprise-grade operations where security cannot be compromised.
New developer tools and integrations
Sonnet 4.5 comes with exciting developer-focused updates:
- Checkpoints in Claude Code for rollbacks and iteration
- Native VS Code extension
- Improved context editing and memory management
- API integrations with AWS Bedrock, Google Vertex AI, and Vercel AI Gateway
Pricing and availability
The pricing remains the same as the previous Sonnet 4 tier: $3 per million input tokens and $15 per million output tokens. Developers can also save with prompt caching and batch processing.
You can try it today on Claude.ai (web, iOS, Android), the Claude Developer Platform, AWS Bedrock, Google Vertex AI, and Vercel AI Gateway.
Who is already using it?
Tech giants like Meta and Apple are using Claude Sonnet 4.5 in their automation pipelines. Enterprises and startups are adopting it for cybersecurity, financial analysis, and large-scale software builds.
FAQs about Claude Sonnet 4.5
1. Can Claude Sonnet 4.5 really code entire apps on its own?
Yes, it can autonomously code applications with thousands of lines of code, maintaining context for more than 30 hours.
2. Is it safe for enterprise use?
Absolutely. Anthropic has added stronger safeguards against prompt injection, sycophancy, and misuse, making it enterprise-ready.
3. Where can I access Claude Sonnet 4.5?
You can use it on Claude.ai, AWS Bedrock, Google Vertex AI, and Vercel AI Gateway, with pricing matching the previous Sonnet 4 tier.
