Arena shows side-by-side outputs from Claude Opus 5.5 and GPT-6 Sol
Arena.ai says it has generated side-by-side outputs from Anthropic’s Claude Opus 5.5 and OpenAI’s GPT-6 Sol, and that scores for Claude Opus 5.5 are coming soon.
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View all AI newsClaude Opus 5.5 is available as the first Claude 5.5 model
Anthropic said on September 22, 2026, that Claude Opus 5.5 is available. Claude says it performs at the level of Claude Fable 5.1 for most tasks and costs 40% less to run than Opus 5.