Mentat vs OpenAI Codex: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Mentat and OpenAI Codex side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Mentat
AI coding assistant for terminal
Best for you if:
- • You want a fully free tool (OpenAI Codex requires payment)
OpenAI Codex
Delegate coding tasks in plain language, get pull requests
Best for you if:
- • You want delegate coding tasks in plain language, get pull requests
| At a Glance | Mentat | OpenAI Codex |
|---|---|---|
Starts at | Free plan, paid from $35/mo, billed monthly Pro plan | Free plan |
Category | AI Coding Developer Tools | AI Coding Developer Tools |
Rating | n/a | 4.7/5 G2 4.5 · SourceForge 5.0 5 reviews |
Free plan | Yes | Yes |
Watch out for | Potential overage fees for Pro limits | n/a |
Choose Mentat or OpenAI Codex?
Choose Mentat if
- You want a fully free tool (OpenAI Codex requires payment)
- You want AI coding assistant in terminal
- You want code understanding and generation
Choose OpenAI Codex if
- You want delegate coding tasks in plain language, get pull requests
In-Depth Analysis
Mentat
AI coding assistant for terminal
Mentat's pricing is quite generous with a robust free tier for self-hosters.
Watch out
Potential overage fees for Pro limits
Strengths
- Pro: AI coding assistant in terminal
- Pro: Code understanding and generation
- Pro: Open-source project
- Pro: Command-line interface for developers
- Pro: Context-aware code suggestions
Weaknesses
- Con: Terminal-based (no GUI)
- Con: Setup and configuration needed
- Con: May not match commercial alternatives
- Con: Requires technical proficiency
- Con: Community-driven development
Key features
OpenAI Codex
Delegate coding tasks in plain language, get pull requests
Weaknesses
- Con: Meaningful use requires a paid ChatGPT subscription such as Plus, Pro, Business, or Enterprise, since access on the Free and Go tiers is very limited.
- Con: The cloud sandbox runs with internet access disabled during task execution by default, so any task that needs to install dependencies or call external APIs requires you to manually configure domain allowlists and permitted HTTP methods per environment.
- Con: Codex executes autonomously in isolated containers and hands back a finished pull request, so you cannot steer or correct it mid-task the way you can with interactive assistants like Cursor; you only review the changes after the run completes.
- Con: The Codex CLI assumes a Unix-style environment, so Windows users must run it through WSL2 rather than natively, adding setup friction.
Key features
Plans and prices: Mentat vs OpenAI Codex
| Tool | Plans and prices | Source |
|---|---|---|
| Mentat |
| mentat.ai read Sep 29, 2026 |
| OpenAI Codex | No plan prices on file | openai.com/pricing |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Mentat pricing and OpenAI Codex pricing.
Key Takeaways
Mentat
- Choose if you want AI coding assistant for terminal
OpenAI Codex
- Choose if you want delegate coding tasks in plain language, get pull requests
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- Only OpenAI Codex has a published user rating (4.7/5 from 5 reviews); Mentat has none we can show.
- Mentat starts at $35/mo, billed monthly; OpenAI Codex has no public paid plan price on file.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Mentat and OpenAI Codex compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. Only OpenAI Codex has a published user rating (4.7/5 from 5 reviews); Mentat has none we can show. Mentat starts at $35/mo, billed monthly; OpenAI Codex has no public paid plan price on file. Both have a free plan.
What are Mentat and OpenAI Codex used for?
Mentat: AI coding assistant for terminal. OpenAI Codex: Delegate coding tasks in plain language, get pull requests.
What does Mentat cost vs OpenAI Codex?
Mentat's cheapest paid plan is Pro at $35/mo, billed monthly. OpenAI Codex has no public paid-plan price on file. Prices read on the vendors' pricing pages, latest check Sep 29, 2026.
What's the main difference between Mentat and OpenAI Codex?
Mentat's main strength: AI coding assistant in terminal. OpenAI Codex focuses on delegate coding tasks in plain language, get pull requests.