OpenAI CodexvsOpen WebUI

Full side-by-side comparison — features, pricing, platforms, and which one wins in 2026.

OpenAI Codex

Coding Assistants

Featured

OpenAI coding agent for CLI, IDE, web, desktop, and cloud workflows

Full review →Website ↗

Open WebUI

Chat Interfaces

Beautiful self-hosted ChatGPT-like interface for any LLM

Full review →Website ↗
FeatureOpenAI CodexOpen WebUI
CategoryCoding AssistantsChat Interfaces
PricingIncluded with eligible ChatGPT plans; additional credits availableFree (open-source)
GitHub Stars
✓ More stars
85k
65k
PlatformsmacOS, Windows, Linux, WebmacOS, Linux, Windows, Docker
Key Features
  • ✓ Terminal coding agent
  • ✓ IDE extension
  • ✓ Web and desktop app
  • ✓ Multi-agent workflows
  • ✓ Cloud environments
  • ✓ Worktrees
  • ✓ PR review
  • ✓ MCP and tool use
  • ✓ Ollama integration
  • ✓ Multi-model
  • ✓ RAG
  • ✓ Web search
  • ✓ Voice input/output
  • ✓ Plugins
  • ✓ User management
Pros
  • + Official OpenAI coding agent
  • + Works across CLI, IDE, web, desktop, and cloud
  • + Open-source CLI under Apache-2.0
  • + Strong fit for parallel agent workflows
  • + Designed for end-to-end software tasks and PR review
  • + Feature-rich ChatGPT alternative
  • + Supports Ollama + OpenAI APIs
  • + Document upload and RAG
  • + Multi-user with auth
  • + Very active development
Cons
  • − Usage limits vary by ChatGPT plan
  • − Cloud and ChatGPT surfaces are proprietary
  • − Autonomous code changes still require review
  • − Team controls depend on workspace plan
  • − Requires Docker for easy setup
  • − Can be slow with large documents
  • − Plugin ecosystem still growing
  • − Resource intensive
Tags
codingagenticcliideopenaichatgptmulti-agent
open-sourcechatuiollamaself-hosted

Want to compare different tools?

← Back to compare picker

Related Comparisons

OpenAI Codex vs Cursor →Open WebUI vs Cursor →OpenAI Codex vs Claude Code →Open WebUI vs Claude Code →OpenAI Codex vs Cline →Open WebUI vs Cline →OpenAI Codex vs Devin →Open WebUI vs Devin →OpenAI Codex vs GitHub Copilot →Open WebUI vs GitHub Copilot →OpenAI Codex vs Ollama Web UI →Open WebUI vs Ollama Web UI →