Coding · Head-to-head
OpenAI Codex vs Grok Build
OpenAI Codex vs Grok Build: pricing, features, and which to pick in 2026.
The verdict
Pick OpenAI Codex if…
- →overall capability matters more than price (AI Score 8.8 vs 8.2)
- →your primary use case is teams already standardised on chatgpt who want the coding agent bundled with the seats they pay for, and who want the same agent in a terminal, an editor and a pull request.
Pick Grok Build if…
- →your primary use case is developers who want a terminal agent on grok 4.6 with a plan you approve before edits.
Side-by-side specs
| Spec | OpenAI Codex | Grok Build |
|---|---|---|
| Category | Coding | Coding |
| Pricing model | freemium | freemium |
| Headline pricing | Included with ChatGPT Free, Go, Plus, Pro, Business, Edu and Enterprise plans | Product page says you can try it free; SuperGrok and X Premium+ still listed as paid paths |
| Free tier | Yes. OpenAI documents Codex as included on the ChatGPT Free plan, with access described as restricted to basic tasks. | The August 2026 product page advertises a free try. Limits are not spelled out on that page. |
| AI Score | 8.8/10 | 8.2/10 |
| Best for | Teams already standardised on ChatGPT who want the coding agent bundled with the seats they pay for, and who want the same agent in a terminal, an editor and a pull request. | Developers who want a terminal agent on Grok 4.6 with a plan you approve before edits. |
| Editor's pick | — | — |
| Use cases | development agents productivity | development agents productivity |
| Date added | 2026-08-02 | 2026-05-26 |
Pros and cons
🧑💻
OpenAI Codex
Coding · freemium
Pros
- ✓Included in ChatGPT plans from the free tier upward, so most organisations already own it
- ✓Covers the terminal, the editor, a hosted cloud runner, the ChatGPT apps and GitHub pull request review from one entitlement
- ✓AGENTS.md keeps agent configuration in the repo and under version control rather than in someone's local settings
- ✓Three GPT-5.6 variants let a team route cheap work to Luna and hard work to Sol instead of paying one rate for everything
- ✓Overflow credits are priced per million tokens, which makes the marginal cost of extra work legible
Cons
- ×Published limits are ranges per rolling five-hour window that span two orders of magnitude, so the included allowance is not knowable in advance
- ×Usage depends on which model variant a task routes to, and routing is not fully under the user's control
- ×Pro pricing is presented as tiers rather than a single figure, so the real cost of the heavy plan needs checking at the point of sale
- ×The agent is tied to a ChatGPT account, which is awkward for teams that standardised on a different assistant vendor
Grok Build
Coding · freemium
Pros
- ✓Defaults to Grok 4.6 as of August 12, 2026
- ✓Plan review before edits is built in, not a plugin
- ✓Skills, hooks, and MCP are documented on the product page
- ✓Install is a single documented curl command
Cons
- ×Free-try limits are not published on the product page
- ×Terminal-only; no first-party IDE listed next to the CLI
- ×Not the same product as Grok Bot, which has its own paid gate
- ×First-week 2x usage offer ends August 19, 2026
Related comparisons
Updated 2026-08-17. Spec data sourced from official product pages and tracked in our public directory at /tools.