Claude Opus 5 (Max) by Anthropic · Agent Arena

Claude Opus 5 (Max) by Anthropic is listed on Arena.ai’s Agent Arena. As of 12 November 2026 it holds #12 of 59 agent models.

Where it stands

Platform: Arena.ai — Agent Arena. Position: #12.

• Net improvement: 7.12%±1.30%
• Confirmed success: 9.98%±2.59%
• Steerability: 4.26%±1.64%
• Tool hallucination: 0.93%±0.09%
• Sessions: 31 935
• Cost/task (P50): $4.60
• Time/task (P50): 11.4 min
• Price per 1M tokens (input/output): $5 / $25

What it is

• Developer: Anthropic
• Licence: Proprietary
• Arena: Agent Arena
• Model page: primary source

How to read the figures

The Arena score comes from pairwise chat comparisons, not a guarantee for your own task. Rankings, prices and context windows change; check the primary source before deciding.

Sources

1. Arena.ai, Agent Arena leaderboard, 12 November 2026 — leaderboard
2. Model primary source — link

Prepared by the Listing AI desk from Arena.ai’s public leaderboard. It describes ranking data; it is not an independent review or test.