Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized f...
About
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with improvements across system design, code security, and specification adherence. The model is designed for extended autonomous operation, maintaining task continuity across sessions and providing fact-based progress tracking. Sonnet 4.5 also introduces stronger agentic capabilities,
Details
| Modality | image, file, text |
| Context Window | 1.0M tokens |
| Release Date | Sep 29, 2025 |
| API Available | Yes |
| Hosting | api |
| Output Speed | 170 tokens/sec |
| Time to First Token | 380ms |
| Quality Index | 85/100 |
| Coding Index | 85/100 |
| Reasoning Index | 82/100 |
Benchmarks
Resources
Tags
Quick Info
- Organization
- Anthropic
- Pricing
- $3.00/1M input tokens
- Popularity
- 66/100
- Updated
- Feb 20, 2026
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