Maximize Reasoning Output by Tuning the Claude Opus 5 Effort Level
Switch to 'max' effort for high-stakes reasoning and coding tasks.
Use the new 'effort' parameter to control Claude Opus 5's internal thinking depth, selecting 'max' for complex, capability-critical work.
The Scenario
You are working on a capability-critical task like architectural system design or complex mathematical reasoning where accuracy is more important than speed.
Before & after
Previously, users had to manually break complex logic into multiple prompts or 'chain-of-thought' steps, often taking 30–60 minutes of manual checking.
By adjusting the effort parameter to 'max', Claude Opus 5 engages deeper 'thinking' pathways automatically to solve complex problems in 2–5 minutes.
The Prompt
Under the API settings or your model configuration for Claude Opus 5, set the following parameter: {"thinking": {"type": "enabled", "budget_tokens": 16000}, "effort": "max"}. Then, provide your complex task: [PASTE_COMPLEX_LOGIC_OR_CODE_PROBLEM_HERE]Claude Opus 5 introduces a native 'thinking' mode that is enabled by default. To get the best results for high-stakes reasoning, math, or coding, you must steer the model using the 'effort' control levels (low, medium, high, xhigh, max).
Source
Claude Platform release notes - Claude Platform Docs"Effort is the primary control for steering Claude Opus 5: the model supports the full ladder... with max for capability-critical work."