Claude Opus 5.5
Anthropic's flagship and the highest scorer in the app on the independent index: 58 at its max setting, one point behind Google's Gemini 4 Carbon, the board's leader.
Anthropic, reasoning. Checked 30 October 2026.
Where to use it through an API
Anthropicclaude-opus-5-5
The maker publishes its own benchmarks and limits on its model page.
How it compares
The models just above and below it on the Artificial Analysis Intelligence Index.
| Model | Index | Context | Speed |
|---|---|---|---|
| Claude Opus 5.5 | 58 | 1M | 98/s |
| GPT-6 Astra | 57 | 1M | 78/s |
| GPT-6.1 Sol | 55 | 1M | 79/s |
| Claude Sonnet 5.5 | 54 | 1M | 137/s |
Use Claude Opus 5.5 with every other AI at once
Put Claude Opus 5.5 in one panel and ChatGPT, Claude, Gemini or any of 300+ models in the others. One message goes to all of them, answers arrive side by side, and test mode times them and hides the names so you judge fairly. Free during the beta with your own keys.
Questions
Is there a free Claude Opus 5.5 API?
Not that we found. Claude Opus 5.5 is paid per token through Anthropic.
What is the Claude Opus 5.5 model id?
Anthropic: claude-opus-5-5.
How does Claude Opus 5.5 score?
58 on the Artificial Analysis Intelligence Index at its max setting, checked 30 October 2026.
Can I use Claude Opus 5.5 with ChatGPT, Claude and Gemini at the same time?
Yes. MultiScreenAI puts Claude Opus 5.5 in one panel and other models in the others, sends one message to all of them and shows the answers side by side.