Claude Opus 5.5
Parameters
Undisclosed
Context Length
1M
Modality
Multimodal
Architecture
Undisclosed
License
Proprietary
Release Date
22 Sept 2026
Knowledge Cutoff
-
API Pricing (per 1M)
Input: $4.00 · Output: $20.00
Evaluation Benchmarks
Rank
#1
| Benchmark | Score | Rank |
|---|---|---|
Mathematics | max 0.97 | 🥇 1 |
Web Development | max 1809 | 🥇 1 |
Agent Arena | max 0.21 | 🥇 1 |
Intelligence Index | max 0.58 high 0.52 medium 0.48 low 0.34 | 🥇 1 6 14 58 |
General Text | high 1509 | 🥈 2 |
Agentic Coding | max 0.72 | 🥈 2 |
General | max 0.83 | 🥉 3 |
Coding | max 0.89 | 🥉 3 |
LiveBench Average | max 0.83 | 🥉 3 |
Reasoning | max 0.92 | 4 |
Data Analysis | max 0.80 | 8 |
Rankings
Overall Rank
#1 🥇
Coding Rank
#1 🥇
About Claude Opus 5.5
Claude Opus 5.5 is Anthropic's premier frontier model designed for demanding reasoning, multi-file software engineering, and long-horizon agentic workflows. It significantly enhances autonomous codebase navigation, debugging, and complex technical synthesis.
Technical Specifications
Architecture specifications are undisclosed for proprietary models.
About Claude Opus 5
Anthropic's fifth-generation flagship Opus model engineered for high-autonomy reasoning, advanced multi-agent coordination, and complex software engineering with an expansive context window.