Claude Opus 4.5 offers a very large context window — up to about 200,000 tokens — which makes it much easier for agents to carry long conversations, multi-step workflows, or entire documents without losing track. :contentReference[oaicite:0]{index=0} Because of this, you can feed in large files (e.g. long specifications, design docs, or a full monorepo diff) and expect Opus to keep them “in mind” throughout tasks such as code generation, review, or multi-part editing.
On top of sheer context length, Opus 4.5 introduces improved context summarization and compaction mechanisms. When a conversation or work session becomes very long, the model automatically condenses earlier parts (summaries, highlights, key decision points) so that the working context stays manageable without cutting off important history. :contentReference[oaicite:1]{index=1} For agent workflows that involve many steps — such as planning, writing code, iterating, testing, and writing docs — this allows the agent to maintain relevant context without being overwhelmed by token budget.
Finally, Opus 4.5 improves memory and consistency across long-horizon tasks: it better tracks state across files and sessions, which helps with ongoing enterprise projects, document edits, or spreadsheet/slide creation. :contentReference[oaicite:2]{index=2} This makes it well suited for agents that need to act over sequences of actions, follow a design spec, or manage dependencies across many parts of a project — preserving continuity and coherence without manual context juggling.