Getting the most out of Opus 5.5 in Claude and Claude Code / claude.dev (claude.dev)

OpenAI has released Opus 5.5, enhancing the Claude and Claude Code applications with significant improvements for handling long, complex tasks more autonomously. The model's ability to work independently has been refined, allowing it to manage multi-step processes efficiently, such as migrating endpoints or auditing code, without requiring constant oversight. This version introduces a set of best practices for users, encouraging them to provide clear finish lines and avoid unnecessary prompts, as Opus 5.5 now automatically thinks before each response and seamlessly integrates progress updates within its workflow. These enhancements are particularly impactful for the AI/ML community, as they streamline collaboration between developers and AI during tasks that typically require extensive human intervention, significantly increasing productivity. Notably, the model's capability to organize tasks into files, manage long-running sessions with clarity, and utilize subagents for parallel processing marks a significant step in automating code reviews and migrations. Furthermore, the introduction of Fable-level bio and cyber safeguards prioritizes security and ethical guidelines in AI interactions, ensuring that developers can rely on Opus 5.5 for both effectiveness and compliance in their work.