Claude Opus 5.5 — Rank #2 in LLM
Claude Opus 5.5 is a large language model from anthropic. It currently sits at #2 in the LLM ranking with an arena ELO score of 1,512, compared with 1,533 for Gemini 4 Argon. Anthropic · #2 in the text arena · 3,932 community votes
- Company
- anthropic
- Category
- Large Language Models
- Arena ELO
- 1,512
- Community votes
- 3,932
- Licence
- Proprietary
- Arena
- text · 30 Sep 2026
Ranked #2 of every model LMArena has rated in the text arena.· Position 2 of 15 in LLM· Source: LMArena, published 30 September 2026
What Claude Opus 5.5 is used for
Language models are general-purpose. The same model that drafts your emails will summarise a contract, answer support tickets, write code and route a workflow — the differences between the top models show up on long tasks, strict instruction following, tool use and cost at volume rather than on simple prompts. For anything customer-facing, verify the model on your own examples before you commit: benchmark wins do not always transfer to a narrow, well-defined task.
How Claude Opus 5.5 compares
The closest models in the same category, by arena ELO score.
| Model | Company | ELO | Note |
|---|---|---|---|
| Gemini 4 Argon | 1,533 | Google · #1 in the text arena · 4,942 community votes | |
| Claude Fable 5.1 | anthropic | 1,511 | Anthropic · #3 in the text arena · 11,241 community votes |
| Claude Opus 5 | anthropic | 1,506 | Anthropic · #4 in the text arena · 28,351 community votes |
| Claude Opus 4.6 | anthropic | 1,504 | Anthropic · #5 in the text arena · 77,193 community votes |
| Gemini 3.8 Flash | 1,496 | Google · #6 in the text arena · 24,828 community votes |