Claude Sonnet 5.5
Parameters
Undisclosed
Context Length
1M
Modality
Multimodal
Architecture
Undisclosed
License
Proprietary
Release Date
28 Sept 2026
Knowledge Cutoff
-
API Pricing (per 1M)
Input: $2.00 · Output: $10.00
Evaluation Benchmarks
Rank
#6
| Benchmark | Score | Rank |
|---|---|---|
Coding | max 0.91 | 🥇 1 |
Intelligence Index | max 0.56 high 0.47 medium 0.41 low 0.36 | 🥈 2 22 47 72 |
Web Development | max 1774 high 1715 | 🥉 3 6 |
Mathematics | max 0.97 | 5 |
Reasoning | max 0.92 | 6 |
Agent Arena | max 0.11 | 6 |
Data Analysis | max 0.79 | 18 |
General | max 0.78 | 21 |
LiveBench Average | max 0.78 | 21 |
Agentic Coding | max 0.56 | 25 |
General Text | max 1476 | 28 |
Rankings
Overall Rank
#6
Coding Rank
#2 🥈
About Claude Sonnet 5.5
Claude Sonnet 5.5 is Anthropic's frontier Sonnet-class model designed for everyday professional workflows, software engineering, and multi-step reasoning. It offers enhanced feature implementation, bug fixing, and long-context capabilities up to one million tokens.
Technical Specifications
Architecture specifications are undisclosed for proprietary models.
About Claude Sonnet 5
Anthropic's Claude Sonnet 5, released June 30, 2026, is built to be the most agentic Sonnet-class model, offering near-Opus 4.8 level intelligence, coding, and tool use at Sonnet pricing. It features a 1M token context window by default, 128k maximum output tokens, and adaptive thinking enabled by default.