Arena.ai(@arena):Claude Opus 5 vs GPT 5.6 in Agent Arena Highlights: - Opus (High) and Opus (Max) outperform GPT Sol (xHigh), but at higher cost. - Opus (Medium) matches GPT Sol (xHigh) in performance at approximately the same cost. - Fable 5 (High) achieves the most optimal price vs. performance trade off. Real-world cost reflects total task execution, not just per-token pricing, so additional iterations and tool calls increase overall expense.

Arena.ai

@arena

Where AI meets the real world. We measure and advance the frontier of AI through community-driven evaluation. We’re hiring →

Joined March 2023

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Arena.ai@arena

2026.07.29 16:00

Claude Opus 5 vs GPT 5.6 in Agent Arena Highlights: - Opus (High) and Opus (Max) outperform GPT Sol (xHigh), but at higher cost. - Opus (Medium) matches GPT Sol (xHigh) in performance at approximately the same cost. - Fable 5 (High) achieves the most optimal price vs. performance trade off. Real-world cost reflects total task execution, not just per-token pricing, so additional iterations and tool calls increase overall expense.