Claude Sonnet 4.5 marks Anthropic's major update, released on September 29, 2025. This model pushes AI boundaries in coding with extended autonomy and better benchmarks.
Overview of Claude Sonnet 4.5's Core Upgrades
Anthropic's release focuses on practical improvements for developers. The model handles complex tasks, operating autonomously for over 30 hours and generating thousands of lines of code.
Here's a summary of its standout enhancements:
- State-of-the-art coding on SWE-Bench Verified, scoring 77.2%
- Improved computer use, reaching 61.4% on OSWorld
- Enhanced agent features for tool coordination and context management
- Integration options like GitHub Copilot and VS Code extension
Technical Performance Highlights
This model outpaces earlier versions in key areas. It beats previous benchmarks, with SWE-Bench scores up from 72.7% and OSWorld from 42.2%.
It excels at browser tasks, including:
- Taking screenshots
- Precise cursor movements and clicks
- Form filling and website navigation
- Multi-step workflows across apps
In tests, it built a full chat application from scratch, showing its ability to maintain focus.
Product Features and Ecosystem Updates
Anthropic enhanced their tools alongside the model. Key additions include:
- Checkpoints for saving and rolling back progress
- Upgraded terminal interface for command-line work
- Native VS Code integration
- Context tools for longer tasks
The Claude Agent SDK provides developer access to:
- Virtual machines for isolated environments
- Memory systems for extended operations
- Coordination for multiple agents
- Tools for large workflows
Apps now support direct code execution and file creation for spreadsheets and documents.
Pricing Breakdown
Pricing stays consistent with the prior version:
| Token Type | USD Cost | INR Cost (Approximate) |
|---|---|---|
| Input Tokens | $3 per million | ₹252 per million |
| Output Tokens | $15 per million | ₹1,260 per million |
This structure positions it as a premium option for advanced use.
Safety and Real-World Applications
Safety improvements make it more reliable, with better detection of harmful requests and reduced errors.
For developers, it's ideal for:
- Building complete applications
- Debugging across files
- Refactoring code
- Handling documentation
Business users benefit in:
- Financial modeling
- Cybersecurity analysis
- Research synthesis
- Process automation
Content creators can use it for workflow management and data analysis.
Comparison to Other Models
When stacked against competitors:
| Feature | Claude Sonnet 4.5 | GPT-5 |
|---|---|---|
| SWE-Bench Score | 77.2% | 74.5% |
| Autonomous Time | 30+ hours | ~7 hours |
| Pricing Input/Output | $3/$15 per million | $1.25/$10 per million |
Versus prior Claude models, it offers 19% better coding scores and four times longer operation.
Getting Started and Limitations
Access is available via free web and app options, or paid plans at $20 and $100 monthly.
Best practices include using extended thinking for complex tasks and saving checkpoints.
Potential drawbacks are its cost and beta computer use features, which may have errors in actions like scrolling.
Overall, this model boosts efficiency for coding projects.
Next Steps with Claude Sonnet 4.5
The model's capabilities make it a strong choice for demanding workflows.
➡️ Discover Full Details on Claude Sonnet 4.5 Features and Review Here
After the intro of the next section, here's the embedded video for more insights.
Video Demonstration
Intro to the video content.
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