Anthropic has unveiled Claude Sonnet 4.5, claiming the title of the world’s best AI coding model. This flagship release represents a massive leap in autonomous AI capabilities, setting new benchmarks across coding, reasoning, and real-world task completion.
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Claude Sonnet 4.5: Key Features
The latest iteration showcases remarkable endurance, working autonomously for an impressive 30 hours on complex, multi-step tasks—far exceeding previous AI models. It achieved state-of-the-art performance on SWE-bench Verified with a 77.2% score, which tests real-world software coding abilities across 500 complex problems.
| Feature | Details |
|---|---|
| Autonomous Runtime | 30+ hours continuous operation |
| SWE-bench Score | 77.2% (industry-leading) |
| OSWorld Performance | 61.4% (real-world computer tasks) |
| Pricing | $3/$15 per million tokens |
| Model Identifier | claude-sonnet-4-5 |
| Availability | API, apps, Claude Code |
| Key Strength | Complex agent building & coding |
Revolutionary Computer Use Capabilities
Claude Sonnet 4.5 excels at computer use tasks, achieving 61.4% on OSWorld benchmarks—a significant jump from Claude Sonnet 4’s 42.2% just four months ago. This advancement enables the AI to navigate websites, fill spreadsheets, and complete real-world computer tasks with unprecedented accuracy. The Claude for Chrome extension leverages these capabilities, allowing users to automate complex browser-based workflows seamlessly.
Major Product Upgrades
Alongside the model launch, Anthropic introduced the Claude Agent SDK—the same infrastructure powering Claude Code—now available to developers for building custom AI agents. The SDK solves critical challenges like memory management across long-running tasks, permission systems balancing autonomy with user control, and coordinating multiple subagents toward shared goals.
Additional upgrades include checkpoints in Claude Code (a highly requested feature), a native VS Code extension, and direct file creation capabilities for spreadsheets, presentations, and documents within chat conversations. For more AI technology updates, visit TechnoSports.
Enhanced Safety and Alignment
Claude Sonnet 4.5 is Anthropic’s most aligned frontier model yet, showing substantial improvements in reducing concerning behaviors like sycophancy, deception, and power-seeking tendencies. The model includes advanced protections against prompt injection attacks—one of the most serious risks for agentic AI applications.
