{"id":"claude-sonnet-4-5-20250929-thinking","slug":"claude-sonnet-4-5-20250929-thinking","name":"Claude Sonnet 4.5 20250929 Thinking","orgId":"anthropic","family":"claude-sonnet-4-5-20250929-thinking","releaseDate":null,"availability":"unreleased","openWeights":false,"license":"Proprietary","paramsTotal":null,"contextWindow":null,"knowledgeCutoff":null,"modelCardUrl":"https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset","hfRepo":null,"modalities":["text"],"aliases":["claude-sonnet-4-5-20250929-thinking-32k","Claude Sonnet 4.5 20250929 Thinking"],"aliasNote":null,"organization":{"id":"anthropic","name":"Anthropic","slug":"anthropic","country":null,"url":null,"color":"#D97757","mark":"A"},"price":null,"answer":{"word":"Not yet.","scope":"Not released, so it cannot be state of the art.","lead":"As of Oct 14, 2026, Claude Sonnet 4.5 20250929 Thinking from Anthropic. Not released, so it cannot be state of the art. Announced but not publicly usable, so it cannot hold General LLM.","confidence":"low"},"verdicts":[{"id":"v_overall_general-llm_claude-sonnet-4-5-20250929-thinking_2026-10-14_open_UNRELEASED","model":"claude-sonnet-4-5-20250929-thinking","model_name":"Claude Sonnet 4.5 20250929 Thinking","category":"general-llm","category_name":"General LLM","slice":"overall","state":"UNRELEASED","rank":null,"margin":null,"confidence":"low","valid_from":"2026-10-14","valid_to":null,"configuration":null,"rationale":"Announced but not publicly usable, so it cannot hold General LLM.","safeguard_flags":["no_primary_evidence"],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Unreleased"}]}