OpenAI Codex CLI
CLI coding tool included with ChatGPT Plus
AI Tier List rates OpenAI Codex CLI Tier S among 23 Coding & Development tools, last re-evaluated Aug 2, 2026. How we rank →
Claude CodeS
CursorS
AiderA
DevinA
Devin DesktopAView all Detailed Description
OpenAI Codex CLI comes included with ChatGPT Plus ($20/month) for great value. GPT-5.1-Codex achieves 77% on SWE-bench at ~50% lower cost per token vs Claude. Supports cloud agent mode.
Is OpenAI Codex CLI still worth it in 2026?
With the integration of the GPT-5.6 model and a high-performance Rust-based architecture, it maintains top-tier performance in the terminal coding agent market. It remains highly competitive by offering superior integration with the OpenAI ecosystem and innovative features like real-time voice sessions compared to its rivals.
Pros & Cons
- GPT-5.6 model support
- fast local execution via Rust
- WebRTC real-time voice sessions
- MCP resource reading support
- seamless workflow integration with ChatGPT Plus
- High dependency on the OpenAI ecosystem
- lack of general-purpose flexibility compared to Claude Code
- opaque enterprise pricing structure
Recent Changes
Set GPT-5.6 as default model, updated to v0.146.0, enabled WebRTC-based real-time voice sessions, enhanced MCP resource reading capabilities
OpenAI Codex CLI FAQ
Is OpenAI Codex CLI free?
Partly. OpenAI Codex CLI has a free plan, with paid upgrades once you hit its limits or need advanced features. Check the official pricing page for the current limits.
Is OpenAI Codex CLI still worth using in 2026?
Yes. OpenAI Codex CLI is currently S-Tier for Coding & Development, the first tool we'd pick in this category. With the integration of the GPT-5.6 model and a high-performance Rust-based architecture, it maintains top-tier performance in the terminal coding agent market. It remains highly competitive by offering superior integration with the OpenAI ecosystem and innovative features like real-time voice sessions compared to its rivals. Last re-evaluated Aug 2, 2026.
What tier is OpenAI Codex CLI rated?
AI Tier List rates OpenAI Codex CLI as Tier S for Coding & Development. With the integration of the GPT-5.6 model and a high-performance Rust-based architecture, it maintains top-tier performance in the terminal coding agent market. It remains highly competitive by offering superior integration with the OpenAI ecosystem and innovative features like real-time voice sessions compared to its rivals.
What is OpenAI Codex CLI best for?
CLI coding tool included with ChatGPT Plus Best for: CLI, Agentic, Async, Cloud Agent.
What are the best OpenAI Codex CLI alternatives?
Top Coding & Development alternatives to OpenAI Codex CLI include Claude Code, Cursor, Aider, Devin. Compare their tiers on AI Tier List.
OpenAI Codex CLI vs Claude Code: which should I use?
OpenAI Codex CLI is Tier S — With the integration of the GPT-5.6 model and a high-performance Rust-based architecture, it maintains top-tier performance in the terminal coding agent market. It remains highly competitive by offering superior integration with the OpenAI ecosystem and innovative features like real-time voice sessions compared to its rivals. Claude Code is Tier S — While Claude Code possesses exceptional autonomous coding capabilities, its CLI-centric, closed interface and high barrier to entry hinder its adoption as a mainstream development tool. With powerful GUI-based competitors like Cursor dominating the market, its limited accessibility for general users restricts it to a niche tool for experienced developers.
OpenAI Codex CLI alternatives
All OpenAI Codex CLI alternatives
Claude Code
PaidClaude Code is Anthropic's CLI-based agentic coding tool that achieves 44.3% on SWE-rebench using Claude Sonnet 4.5, the highest score for autonomous software engineering. It can work autonomously for 45+ minutes and generates PRs indistinguishable from human work.
Cursor
FreemiumCursor is a next-generation code editor with integrated AI capabilities. It is designed to help developers write, edit, and debug code faster and more efficiently. It revolutionizes the development workflow through AI chatbots, code generation, and modification suggestions.
Aider
FreeAider is an open-source CLI coding tool with 38,500+ GitHub stars. Achieves 83% on Aider Polyglot benchmark with o3-high + GPT-4.1 architect mode. Maximum flexibility with any API key.
Devin
FreemiumDevin exemplifies AI overhype. Despite $10.2B valuation, independent tests show ~15% task success rate. Price drop from $500/month to $20/month signals struggles.
Devin Desktop
FreemiumDevin Desktop runs directly on the user's local machine to manage complex coding projects and resolve technical issues. It allows developers to offload repetitive tasks, enabling them to focus on high-level design and architectural decisions.
Mintlify
FreemiumMintlify leverages AI to automatically generate and maintain high-quality documentation for developers' codebases. It helps developers save time on documentation, allowing them to focus on core development tasks.
Coding & Development currently lists 23 tools, of which 3 are Tier S alongside OpenAI Codex CLI. Other Tier S tools in the category include Claude Code, Cursor. For free options only, see free Coding & Development tools.
Rating history
- Tier A → S
- Tier B → A
- Tier A → B
- Pricing paid → freemium