LMArena has listed four new models, including 'claude-sonnet-5-5-max-agent' and 'step-5-pr

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Oct 2, 2026 17:20 UTC lmarena lmarena.ai/leaderboard

LMArena has listed four new models, including 'claude-sonnet-5-5-max-agent' and 'step-5-preview-agent', potentially indicating upcoming releases or tests.

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seeing a claude-sonnet-5-5-max-agent and step-5-preview-agent pop up on lmarena. interesting to see what these might be!

lmarena just added a few new models to their leaderboard, including what looks like a new claude sonnet and a step-5 preview. things are moving fast.

LMArena: 4 new models appeared on the leaderboard (labs test unreleased models here — often weeks before launch) [named / preview] (4) + claude-sonnet-5-5-max-agent + contenders/claude-sonnet-5-5-max-agent + contenders/step-5-preview-agent + step-5-preview-agent