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Extended Thinking: xhigh Effort

🧠 Claude Advanced Reasoning⏱ 12 min⭐ 850 BASE XP⌨ HANDS-ON LAB

Pushing Claude to the Limit

Extended Thinking was introduced in the Claude 3.7 era, allowing the model to generate a hidden chain of thought before answering. In 2026, Anthropic introduced extreme granularity for this feature.

The xhigh Effort Parameter

You can now set the effort parameter to xhigh (Extra High) alongside the standard low, medium, and high.

{
  "model": "claude-opus-4-8",
  "thinking": {
    "type": "adaptive",
    "effort": "xhigh"
  },
  "messages": [...]
}

When to use xhigh

  • NP-Hard Problems: Complex scheduling, constraint satisfaction, and advanced math.
  • Architectural Code Generation: Generating entire multi-file project structures from scratch.
  • Deep Forensic Analysis: Finding obscure bugs in massive log files.
🚧 Cost Warning: The xhigh effort parameter allows Claude to consume up to 128,000 thinking tokens before generating an output. This can be extremely expensive. Always use budget caps in production.
⌨ HANDS-ON LABDial Thinking Effort to xhigh
⭐ +200 XP

A constraint-satisfaction puzzle keeps defeating your default calls. Escalate: run it at standard effort, then unleash xhigh and compare the thinking spend.

1Call Opus 4.8 with adaptive thinking at the default high effort.
2Now escalate the same request to effort: xhigh — maximum hidden reasoning budget.
lab-sandbox — simulated environment
INFINITY LAB SANDBOX v2.6 — simulated shell
Type the command for the current objective. Helpers: "hint", "solution", "clear".
$
OBJECTIVE 1 / 2 — type "hint" if stuck
SYNAPSE VERIFICATION
QUERY 1 // 2
What does the 'xhigh' effort parameter do?
It makes Claude talk faster
It allows Claude to consume massive amounts of thinking tokens (up to 128k) for extreme reasoning tasks before outputting
It forces Claude to use tool calls
It increases image resolution
Extended Thinking: xhigh Effort Tutorial | Claude Advanced Reasoning — Claude Academy