Claude Sonnet 5.5 specs, prices, where it runs and its benchmark standing
closed weights · #8 overall, podium score 22.7 · top 10 on 5 of 9 · released Sep 28, 2026
Facts
- Provider
- Anthropic
- Release date
- Sep 28, 2026
- Boards
- Parameters
- Not disclosed by Anthropic
- Weights
- Closed weights
- Benchmarks
- 9 boards captured, #8 overall
9 of 9 boards
| Rank | Board | Score | |||
|---|---|---|---|---|---|
| 2 | Reasoning | 56.0 | 100 | ||
| 2 | Reasoning | 95.6% | 100 | ||
| 3 | Reasoning | 165.2 | 100 | ||
| 3 | Coding | 1,786 | 100 | ||
| 5 | Speed | 139 tok/s | 25 | ||
| 17 | Price | $4.00 | 25 | ||
| 20 | Reasoning | 77.8% | 60 | ||
| 29 | Vision | 1,268 | 100 | ||
| 39 | Chat | 1,471 | 100 |
Versions and release history
7 versions in this line since Feb 24, 2025, from Pricing, OpenRouter and the boards.
| Version | Released | |
|---|---|---|
| Claude Sonnet 5.5this model | Sep 28, 20267 days ago | Boards |
| Claude Sonnet 5 | Jun 30, 20263 months ago | Releases |
| Claude Sonnet 4.6 | Feb 17, 20267 months ago | Boards |
| Claude Sonnet 4.5 | Sep 29, 20251 year ago | Boards |
| Claude Sonnet 4 | May 14, 20251 year ago | Boards |
| Claude 3.7 Sonnet | Feb 24, 20251 year ago | Boards |
| Claude Sonnet 3.5 |
Category ranks, more models and catalog changes
Rank in each category
More from Anthropic
Catalog changes, newest first (kept for good)
- release dateempty to 2026-09-28Oct 2, 2026 3 days ago
- addedempty to Claude Sonnet 5.5Oct 2, 2026 3 days ago