Claude Sonnet 5.5 gets a limited-time Direct Mode on Arena

Arena.ai @arenaOriginally posted 2026.09.30

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For a limited time starting September 30 at 8am PT, Claude Sonnet 5.5 by @Anthropic will be available to test directly on Arena! Once access is live, head to Direct Mode and select it from the dropdown menu. Stay tuned tomorrow for the direct link. Claude Sonnet 5.5 (High) will be available in Direct Mode for 48 hours. It will remain available in Battle and Agent Mode after that, as it already is today.