# Is Claude Opus 5.5 SOTA?

As of Oct 15, 2026, Claude Opus 5.5 is tied for state of the art in Reasoning (since Oct 2, 2026; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).

SOTA in Reasoning (tied), Coding (tied), Coding › Agentic (tied), Coding › Web dev, Long context (tied), and Factuality (tied).

As of Oct 15, 2026, Claude Opus 5.5 is tied for state of the art in Reasoning (since Oct 2, 2026; sources LMArena Text (style-controlled, hard prompts); methodology v1.0). Claude Opus 5.5 holds the confirmed Reasoning crown since 2026-10-02. Muse Wonder leads the latest board, pending a second confirming snapshot.

Methodology v1.0. Computed automatically.

- General LLM: Near-SOTA · General LLM — Close in General LLM: rank #2, 1.1 percentile points behind the leader.
- Reasoning: Co-SOTA · Reasoning — Claude Opus 5.5 holds the confirmed Reasoning crown since 2026-10-02. Muse Wonder leads the latest board, pending a second confirming snapshot.
- Math: Not enough data — #11 on LMArena Text (style-controlled, math); missing Humanity's Last Exam and FrontierMath
- Science: #31 in Science — Last listed at #31 in Science on 2026-09-22. That board does not award a crown.
- Coding: Co-SOTA · Coding — Claude Opus 5.5 is tied for SOTA in Coding with Claude Sonnet 5.5, within the margin of error, since 2026-10-06.
- Coding › Agentic: Co-SOTA · Coding › Agentic — Claude Opus 5.5 is tied for SOTA in Coding › Agentic with Claude Sonnet 5.5, within the margin of error, since 2026-10-06.
- Coding › Web dev: SOTA · Coding › Web dev — Claude Opus 5.5 is SOTA in Coding › Web dev since 2026-09-29. No eligible model is credibly ahead on the weighted primary evidence.
- Long context: Co-SOTA · Long context — Claude Opus 5.5 is tied for SOTA in Long context with Gemini 4 Argon, within the margin of error, since 2026-10-02.
- Vision: Near-SOTA · Vision — Close in Vision: rank #4, 13.2 percentile points behind the leader.
- Factuality: Co-SOTA · Factuality — Claude Opus 5.5 holds the confirmed Factuality crown since 2026-10-02. Muse Wonder leads the latest board, pending a second confirming snapshot.
- Abstraction (ARC): #1 in Abstraction (ARC) — Last listed at #1 in Abstraction (ARC) on 2026-09-22. That board does not award a crown.

## Long context

https://isitsota.com/c/long-context