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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: Pass --user to replicas claude-auth to save OAuth credentials to your account instead of sharing them with the organization. Personal credentials take priority over organization defaults. See Credentials for details.

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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.

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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.