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Replicas runs Claude Code inside isolated workspace VMs, with access to your repository, environment configuration, and integrations.

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Setup

Choose one authentication method: replicas claude-auth saves to your personal account, which works in every organization you belong to and takes priority over organization defaults. Admins can pass --org to share one Claude subscription with every member of the active organization. See Credentials for details, and replicas org to check which organization is active.

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Models

Replicas supports Claude Fable, Opus, Sonnet, and Haiku models. Set the organization default under Organization → Settings → Preferences, or choose a model for an individual chat. The available models depend on the authentication method and model access on the connected Anthropic or Bedrock account. Organization admins can hide models the team cannot access by expanding Claude → Models in Coding Agents settings. The selection applies to workspace, automation, and default-setting pickers.

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Using Claude Code in Workspaces

In a workspace, use the composer’s harness/model picker to choose Claude Code and start or continue a session. Claude Code can:
  • Read and edit files and run shell commands
  • Use environment skills and MCP servers
  • Create branches, commits, and pull requests
  • Run background Bash, Agent, and Monitor tasks
  • Use Plan Mode
Background task status and output appear in the transcript and can continue across turns. See Workspace background tasks.

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Fast Mode

Fast Mode is available for Claude Opus models. Start a message with /fast or use the lightning toggle in the composer.

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Thinking levels

Use Ultracode in the thinking picker to combine xhigh effort with Claude Code dynamic workflows when supported by the connected model and plan.

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Chat history

Claude Code sessions persist across turns and workspace sleep. Send /compact to compact the active session without starting a new one, or use replicas read from the CLI to inspect transcript history.

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Programmatic Use

Select Claude Code anywhere Replicas accepts a coding agent:

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When to Use Claude Code

Claude Code is a strong fit when you want Anthropic-native agent behavior, long-running background tasks, or Claude skills and commands. Use Codex when you need Codex goal mode or OpenAI-native models; use Cursor or Opencode when you prefer their model and authentication ecosystems.