Run Claude Code and Codex Side by Side: Multi-Agent Terminal Setup

Running a single AI coding agent is fine for small tasks. But when you need to refactor a backend module while scaffolding a new API endpoint, one agent becomes a bottleneck. The solution is running Claude Code and OpenAI Codex side by side — each in its own terminal pane, working on the same project simultaneously.

Why Run Two Agents at Once?

AI coding agents are powerful, but they are sequential by nature. Claude Code processes one instruction at a time. Codex does the same. When you pair them together, you unlock genuine parallelism:

• ●Claude Code can analyze your existing codebase, write tests, and handle complex refactors that require deep context understanding.
• ●Codex can generate boilerplate, scaffold new files, and quickly iterate on implementation details.

Instead of waiting for one agent to finish before starting the next task, you run both at the same time. The productivity gain is not 2x — it is often closer to 3x because you eliminate the context-switching overhead between tasks.

Setting Up the Split Pane Workspace

Remocode makes this setup trivial. Open a terminal and press Cmd+D to split right. You now have two panes side by side. Start Claude Code in the left pane and Codex in the right.

Step-by-Step

• ●Open Remocode and navigate to your project directory in the first pane.
• ●Launch Claude Code with claude in the left pane.
• ●Press Cmd+D to create a right split.
• ●Navigate to the same project directory and launch Codex with codex in the right pane.
• ●Give each agent a different task — for example, ask Claude to write integration tests while Codex scaffolds a new route handler.

Both agents see the same file system. When one writes a file, the other can read it on its next turn. This creates a natural workflow where agents build on each other's output without manual copy-paste.

Avoiding File Conflicts

The most common concern with multi-agent setups is file conflicts. Two agents editing the same file at the same time will cause problems. The solution is simple: give each agent a clear scope.

• ●Assign Claude Code to /src/services/ and /tests/.
• ●Assign Codex to /src/routes/ and /src/controllers/.

By splitting ownership at the directory level, you avoid merge conflicts entirely. If both agents need to touch the same file, let one finish first, then hand the file to the other.

Monitoring Both Agents

With Remocode's split pane view, you can watch both agents work in real time. But real productivity comes when you step away and let them run autonomously. That is where Remocode's standup reports shine — scheduled AI-generated summaries of what each agent accomplished, delivered straight to your Telegram.

When to Use This Setup

This multi-agent workflow works best for:

• ●Feature development: One agent builds the feature, the other writes tests.
• ●Code review and refactoring: One agent refactors, the other validates the changes.
• ●Rapid prototyping: Two agents exploring different implementation approaches simultaneously.

Getting Started

Remocode is available for macOS. The first 1,000 users get one year of Pro free — that includes unlimited split panes and multi-agent support. Download it, press Cmd+D, and start running two agents today.