A Claude Code execution mode where the agent maps out the full approach before touching files, asking clarifying questions until it reaches high confidence. Triggered via /plan, shift-tab, or a claude.md rule like ‘do not make changes until you have 95% confidence’. Ultra Plan is a cloud-hosted variant (research preview) that offloads the planning to an Anthropic container running Opus 4.6 with three parallel exploration agents plus a critique agent, delivers a structured doc-style plan on the web with comment and emoji reactions, and teleports the approved plan back to the terminal for execution.
Key points
- Plan mode is the single biggest source of token savings by preventing wrong-path execution
- Ultra Plan runs on cloud Opus 4.6 with 3 parallel exploration + 1 critique agent
- Ultra Plan has a 30-minute cloud cap and requires the project to be synced to a Git repo
- Executing an Ultra Plan often runs faster locally because the plan is cleaner
- Ultra Plan not accessible from desktop app or VS Code extension — CLI only
- Comments and emoji reactions available on cloud-hosted plans for richer review
Related entities
Related concepts
Source references
- [src-004] Nate Herk cluster — Nate Herk — Claude Code cluster (21 videos)
– Videos referenced: T4fXb3sbJIo, 49V-5Ock8LU, tXtCK66fPj8
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