{"id":"claude-opus-5-5","slug":"claude-opus-5-5","name":"Claude Opus 5.5","orgId":"anthropic","family":"claude-opus-5-5","releaseDate":"2026-09-22","availability":"ga","openWeights":false,"license":"Proprietary","paramsTotal":null,"contextWindow":1000000,"knowledgeCutoff":null,"modelCardUrl":"https://www.anthropic.com/claude-opus-5-5","hfRepo":null,"modalities":["text","image","file"],"aliases":["claude-opus-5.5-high","Claude Opus 5.5","claude-opus-5.5-max","claude-opus-5-5_max","claude-opus-5-5_high","claude-opus-5-5_xhigh","claude-opus-5-5_medium","claude-opus-5-5_low","anthropic/claude-opus-5.5","Anthropic: Claude Opus 5.5","Opus 5.5 max"],"aliasNote":null,"organization":{"id":"anthropic","name":"Anthropic","slug":"anthropic","country":null,"url":null,"color":"#D97757","mark":"A"},"price":{"modelId":"claude-opus-5-5","provider":"anthropic","inputPerM":null,"outputPerM":null,"blendedPerM":8.000000000000002,"tokensPerS":null,"observedAt":"2026-10-13","sourceId":"openrouter"},"answer":{"word":"Yes.","scope":"SOTA in co-SOTA in Reasoning, co-SOTA in Coding and co-SOTA in Coding › Agentic.","lead":"As of Oct 13, 2026, Claude Opus 5.5 from Anthropic. SOTA in co-SOTA in Reasoning, co-SOTA in Coding and co-SOTA in Coding › Agentic. Claude Opus 5.5 is tied for SOTA in Coding with Claude Sonnet 5.5, within the margin of error, since 2026-10-06.","confidence":"medium"},"verdicts":[{"id":"v_overall_general-llm_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"general-llm","category_name":"General LLM","slice":"overall","state":"NOT_SOTA","rank":7,"margin":11.111111111111114,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"high","rationale":"Ranked #7 in General LLM.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #7"},{"id":"v_pareto_general-llm_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"general-llm","category_name":"General LLM","slice":"pareto","state":"NOT_SOTA","rank":7,"margin":11.111111111111114,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"high","rationale":"Not on the General LLM cost-quality frontier.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #7"},{"id":"v_overall_reasoning_claude-opus-5-5_2026-10-08_open_CO_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"reasoning","category_name":"Reasoning","slice":"overall","state":"CO_SOTA","rank":7,"margin":0,"confidence":"low","valid_from":"2026-10-08","valid_to":null,"configuration":"high","rationale":"Claude Opus 5.5 is co-SOTA in Reasoning with low confidence because primary sources disagree beyond the margin of error (with GPT-6 Astra, Gemini 4 Argon).","safeguard_flags":["source_conflict"],"co_sota_with":["gpt-6-astra","gemini-4-argon"],"challengers":[],"methodology":"1.0","label":"Co-SOTA · Reasoning"},{"id":"v_pareto_reasoning_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"reasoning","category_name":"Reasoning","slice":"pareto","state":"NOT_SOTA","rank":7,"margin":11.111111111111114,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"high","rationale":"Not on the Reasoning cost-quality frontier.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #7"},{"id":"v_overall_science_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"science","category_name":"Science","slice":"overall","state":"NOT_SOTA","rank":37,"margin":null,"confidence":"low","valid_from":"2026-10-13","valid_to":null,"configuration":"max","rationale":"Last listed at #37 in Science on 2026-09-22. That board does not award a crown.","safeguard_flags":["off_board"],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #37"},{"id":"v_overall_coding_claude-opus-5-5_2026-10-06_open_CO_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"coding","category_name":"Coding","slice":"overall","state":"CO_SOTA","rank":1,"margin":0,"confidence":"medium","valid_from":"2026-10-06","valid_to":null,"configuration":"max","rationale":"Claude Opus 5.5 is tied for SOTA in Coding with Claude Sonnet 5.5, within the margin of error, since 2026-10-06.","safeguard_flags":[],"co_sota_with":["claude-sonnet-5-5"],"challengers":[],"methodology":"1.0","label":"Co-SOTA · Coding"},{"id":"v_pareto_coding_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"coding","category_name":"Coding","slice":"pareto","state":"NOT_SOTA","rank":1,"margin":0,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"max","rationale":"Not on the Coding cost-quality frontier.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #1"},{"id":"v_overall_coding-agentic_claude-opus-5-5_2026-10-06_open_CO_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"coding-agentic","category_name":"Coding › Agentic","slice":"overall","state":"CO_SOTA","rank":1,"margin":0,"confidence":"medium","valid_from":"2026-10-06","valid_to":null,"configuration":"max","rationale":"Claude Opus 5.5 is tied for SOTA in Coding › Agentic with Claude Sonnet 5.5, within the margin of error, since 2026-10-06.","safeguard_flags":[],"co_sota_with":["claude-sonnet-5-5"],"challengers":[],"methodology":"1.0","label":"Co-SOTA · Coding › Agentic"},{"id":"v_pareto_coding-agentic_claude-opus-5-5_2026-10-13_open_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"coding-agentic","category_name":"Coding › Agentic","slice":"pareto","state":"SOTA","rank":1,"margin":0,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"max","rationale":"On the cost-quality frontier for Coding › Agentic: nothing scores better for less than $8.00 per 1M blended tokens.","safeguard_flags":["pareto"],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Pareto · Coding › Agentic"},{"id":"v_overall_coding-web-dev_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"coding-web-dev","category_name":"Coding › Web dev","slice":"overall","state":"NOT_SOTA","rank":1,"margin":0,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"max","rationale":"Ranked #1 in Coding › Web dev.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #1"},{"id":"v_pareto_coding-web-dev_claude-opus-5-5_2026-10-13_open_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"coding-web-dev","category_name":"Coding › Web dev","slice":"pareto","state":"SOTA","rank":1,"margin":0,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"max","rationale":"On the cost-quality frontier for Coding › Web dev: nothing scores better for less than $8.00 per 1M blended tokens.","safeguard_flags":["pareto"],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Pareto · Coding › Web dev"},{"id":"v_overall_long-context_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"long-context","category_name":"Long context","slice":"overall","state":"NOT_SOTA","rank":7,"margin":11.111111111111114,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"high","rationale":"Ranked #7 in Long context.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #7"},{"id":"v_pareto_long-context_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"long-context","category_name":"Long context","slice":"pareto","state":"NOT_SOTA","rank":7,"margin":11.111111111111114,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"high","rationale":"Not on the Long context cost-quality frontier.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #7"},{"id":"v_overall_vision_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"vision","category_name":"Vision","slice":"overall","state":"NOT_SOTA","rank":3,"margin":5.882352941176464,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"max","rationale":"Ranked #3 in Vision.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #3"},{"id":"v_pareto_vision_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"vision","category_name":"Vision","slice":"pareto","state":"NOT_SOTA","rank":3,"margin":5.882352941176464,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"max","rationale":"Not on the Vision cost-quality frontier.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #3"},{"id":"v_overall_factuality_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"factuality","category_name":"Factuality","slice":"overall","state":"NOT_SOTA","rank":2,"margin":12.5,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"high","rationale":"Ranked #2 in Factuality.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #2"},{"id":"v_pareto_factuality_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"factuality","category_name":"Factuality","slice":"pareto","state":"NOT_SOTA","rank":2,"margin":11.111111111111114,"confidence":"medium","valid_from":"2026-10-13","valid_to":null,"configuration":"high","rationale":"Not on the Factuality cost-quality frontier.","safeguard_flags":[],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #2"},{"id":"v_overall_arc_claude-opus-5-5_2026-10-13_open_NOT_SOTA","model":"claude-opus-5-5","model_name":"Claude Opus 5.5","category":"arc","category_name":"Abstraction (ARC)","slice":"overall","state":"NOT_SOTA","rank":1,"margin":null,"confidence":"low","valid_from":"2026-10-13","valid_to":null,"configuration":"high","rationale":"Last listed at #1 in Abstraction (ARC) on 2026-09-22. That board does not award a crown.","safeguard_flags":["off_board"],"co_sota_with":[],"challengers":[],"methodology":"1.0","label":"Not SOTA · #1"}]}