{"id":"claude-sonnet-5-5","slug":"claude-sonnet-5-5","name":"Claude Sonnet 5.5","orgId":"anthropic","family":"claude-sonnet-5-5","releaseDate":"2026-09-28","availability":"ga","openWeights":false,"license":"Proprietary","paramsTotal":null,"contextWindow":1000000,"knowledgeCutoff":null,"modelCardUrl":"https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset","hfRepo":null,"modalities":["text","image","file"],"aliases":["claude-sonnet-5.5-xhigh","Claude Sonnet 5.5","claude-sonnet-5.5-high","claude-sonnet-5-5_max","Sonnet 5.5 max","Sonnet 5.5 (mini-swe-agent) xhigh","anthropic/claude-sonnet-5.5","Anthropic: Claude Sonnet 5.5"],"aliasNote":null,"organization":{"id":"anthropic","name":"Anthropic","slug":"anthropic","country":null,"url":null,"color":"#D97757","mark":"A"},"price":{"modelId":"claude-sonnet-5-5","provider":"anthropic","inputPerM":null,"outputPerM":null,"blendedPerM":4.000000000000001,"tokensPerS":null,"observedAt":"2026-10-14","sourceId":"openrouter"},"answer":{"word":"Yes.","scope":"SOTA in co-SOTA in Coding and co-SOTA in Coding › Agentic.","lead":"As of Oct 14, 2026, Claude Sonnet 5.5 from Anthropic. 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dev"},{"id":"v_overall_long-context_claude-sonnet-5-5_2026-10-14_open_NOT_SOTA","model":"claude-sonnet-5-5","model_name":"Claude Sonnet 5.5","category":"long-context","category_name":"Long context","slice":"overall","state":"NOT_SOTA","rank":10,"margin":6.164383561643831,"confidence":"medium","valid_from":"2026-10-14","valid_to":null,"configuration":"xhigh","rationale":"Ranked #10 in Long context.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #10"},{"id":"v_pareto_long-context_claude-sonnet-5-5_2026-10-14_open_NOT_SOTA","model":"claude-sonnet-5-5","model_name":"Claude Sonnet 5.5","category":"long-context","category_name":"Long context","slice":"pareto","state":"NOT_SOTA","rank":10,"margin":4.7872340425531945,"confidence":"medium","valid_from":"2026-10-14","valid_to":null,"configuration":"xhigh","rationale":"Not on the Long context cost-quality 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Factuality.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #18"},{"id":"v_pareto_factuality_claude-sonnet-5-5_2026-10-14_open_NOT_SOTA","model":"claude-sonnet-5-5","model_name":"Claude Sonnet 5.5","category":"factuality","category_name":"Factuality","slice":"pareto","state":"NOT_SOTA","rank":20,"margin":11.111111111111114,"confidence":"medium","valid_from":"2026-10-14","valid_to":null,"configuration":"xhigh","rationale":"Not on the Factuality cost-quality frontier.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #20"}]}