Comparison

Codex vs Claude Code vs Nimbalyst

OpenAI Codex and Claude Code are two leading coding agents, and most teams do not have to pick just one. Codex is OpenAI's coding agent across the Codex App, CLI, IDE, and cloud surfaces. Claude Code is Anthropic's coding agent, strongest for Claude-first workflows with skills, hooks, and subagents. Nimbalyst is an open-source visual workspace that runs both side by side, so a team can compare them on real work and keep both in one project.

Download

Free for individuals. Works with your existing Claude Code or Codex subscription or API key.

Other downloads: Apple Silicon Mac Intel Mac Windows Linux

Overview

3 tools, different approaches

Nimbalyst

Nimbalyst runs Codex and Claude Code as first-class agent sessions in one workspace. Each session gets a transcript, tracked files, visual diffs, a kanban phase, and optional worktree isolation, next to shared plans, mockups, diagrams, and trackers. Teams keep Codex for the tasks where it shines and Claude Code for the rest, without switching tools. The desktop and iOS apps are MIT licensed and free for individual use.

Codex

Codex is OpenAI's coding agent, built around OpenAI models and the official Codex CLI, app, and hosted surfaces. It reads a codebase, plans changes, edits files, and runs commands from the command line. The Codex CLI is open source under Apache 2.0; the app and hosted surfaces are OpenAI products.

Claude Code

Claude Code is Anthropic's official coding agent. It runs in the terminal and a desktop app, switches among Claude models, and integrates skills, hooks, plugins, subagents, MCP, and Remote Control. It is the reference implementation for Claude-first workflows.

Feature Comparison

Side-by-side breakdown

Feature

Nimbalyst

Codex

Claude Code

Type

Visual workspace above the agents

Coding agent across app, terminal, IDE, and cloud

Terminal coding agent

Builder

Nimbalyst, open source

OpenAI

Anthropic

Models

Runs both: OpenAI through Codex, Claude through Claude Code

Current OpenAI coding models

Current Anthropic Claude models

License

MIT for desktop and iOS apps

Codex CLI is Apache 2.0; app and hosted surfaces are closed

Closed source

Interface

Desktop workspace plus native iOS app

Terminal, app, and hosted surfaces

Terminal plus desktop app

Parallel sessions

Session kanban for many agents at once

Multiple agents in the Codex App; one session per CLI terminal

One session per terminal, git worktrees for parallel runs

MCP support

Yes, ship custom servers and skills as extensions

Yes

Yes, with first-party MCP, hooks, skills, and subagents

Visual editors

Markdown, mockups, diagrams, data models, spreadsheets

Files, terminals, and browser in the app; no linked artifact-editor suite

None, terminal only

Visual diff review

Per-session red/green diffs with approve and reject

In-app diff review and comments; terminal diffs in the CLI

Terminal diffs plus desktop review

Mobile review

Native iOS app for transcripts, diffs, and approvals

Codex access through the ChatGPT mobile app

Remote Control plus claude.ai/code follow-up

Runs inside Nimbalyst

Is the workspace

Yes, as a first-class engine

Nimbalyst Advantages

Where Nimbalyst shines

Codex and Claude Code on one board

Run both agents as tracked sessions in the same project. Move them through phases, see edited files, review diffs, and keep separate worktrees when parallel tasks would collide.

Visual review around either agent

Nimbalyst turns Codex and Claude Code edits into a file-by-file review with inline diffs and commit proposals, instead of parsing raw terminal output.

Artifacts both agents can read

Plans, markdown, mockups, diagrams, and data models live in the same workspace as the code, so whichever agent runs a task can read the project context.

Your coding agents, integrated

Claude Code, Codex, and other supported agents work directly with the files, plans, tasks, and visual artifacts in the workspace.

Every artifact in one workspace

Edit markdown, mockups, diagrams, code, and CSV data together, with the same project context available to people and agents.

Local for individuals, collaborative for teams

Work locally in the MIT-licensed desktop app, or collaborate in real time on shared docs, diagrams, mockups, and trackers.

Recommendation

Who should use which

Choose Nimbalyst if…

Choose Nimbalyst when work spans several agent sessions, a team wants Codex and Claude Code in the same project, and it needs shared planning, visual editors, review, and mobile follow-up around them.

Choose Codex if…

Choose Codex on its own when a team is standardized on OpenAI models and wants the official Codex CLI, app, and hosted surfaces.

Choose Claude Code if…

Choose Claude Code when a team is standardized on Claude and wants the most polished official workflow, with first-party skills, hooks, and subagents and Anthropic's docs as the source of truth.

Many teams run both: Codex on some tasks, Claude Code on others, coordinated in one Nimbalyst workspace. Both run as first-class engines inside Nimbalyst.

FAQ

Frequently asked questions

What is the difference between Codex and Claude Code?

Codex is OpenAI's coding agent, built around OpenAI models and the official Codex CLI, app, and hosted surfaces. Claude Code is Anthropic's coding agent, built around Claude models with skills, hooks, subagents, and MCP. Both read a codebase, plan changes, edit files, and run commands from the command line.

Is Codex or Claude Code better?

Neither wins outright. Codex fits teams standardized on OpenAI models and surfaces. Claude Code fits Claude-first teams that want first-party skills, hooks, and subagents. Many teams keep both and route each task to the agent that handles it best.

Can I use Codex and Claude Code together?

Yes. Nimbalyst runs both as first-class agent sessions in one project, so a team can compare them on the same task and keep each for the work it does best.

Which models do they use?

Codex uses OpenAI's current coding models. Claude Code uses Anthropic's current Claude models. Model names and defaults change frequently, so use each vendor's current documentation for the exact list.

Is Codex open source?

The Codex CLI is open source under Apache 2.0. The Codex app and hosted surfaces are OpenAI products. Claude Code is closed source.

Where does Nimbalyst fit?

Nimbalyst is the open-source visual workspace above the agents, for teams that run Codex and Claude Code together with shared planning, visual diff review, task tracking, visual editors, and mobile follow-up.

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