Anthropic introduced Claude Opus 4.6 with improvements described across coding, search, tools, and documents. The release brings a context window of up to one million tokens in beta and emphasizes planning and sustained work in large codebases.

Context

A larger window helps when the additional material is relevant. It does not guarantee that every constraint or detail will influence the answer. A practical comparison should examine which files and passages support the result, whether early instructions survive a long session, and how much irrelevant material the system carries forward.

Sources & authors

  1. Claude Opus 4.6
    Anthropic · February 5, 2026
ClaudeAnthropicmodels