GoKawiilAnthropic publishes usage guide for Claude's Opus 5.5 model
Anthropic released a guide explaining how to work with its Opus 5.5 model in Claude apps and Claude Code. The guide says Opus 5.5 now reasons before every response automatically, can run longer on multi-step tasks with less oversight, and recommends users state a clear 'done' condition up front rather than micromanaging each step. It also advises dropping older prompt habits like telling the model to 'think carefully,' since that behavior is now built in.
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The guidance suggests Anthropic sees prompting conventions shifting as models take on longer, more autonomous workflows, which could change how developers structure instructions for coding assistants. Early testers reportedly let the model run coding tasks for hours with minimal supervision, hinting at growing reliance on agentic AI behavior in production environments. How much this changes day-to-day developer practice will depend on adoption of the new prompting style.
- Opus 5.5 always reasons internally before replying, removing the need for 'think carefully' style prompts.
- Anthropic recommends giving the model a full task plus a clear 'done' condition and letting it run autonomously.
- Early testers reportedly had Opus 5.5 handle long coding tasks for hours with limited human oversight.
Source: claude.dev — Addy Osmani, 2026-10-03
Published there as: “Getting the most out of Opus 5.5 in Claude and Claude Code”
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