Codex (OpenAI)
Free tier available
- Free$0
- Go$8/mo
- Plus$20/mo
A
8.3/10Codex (OpenAI)
GPT-5.2-Codex (default 2026-04-23) / GPT-5.5 / GPT-5.4
VS
Our pickA
8.8/10ChatGPT
Codex (OpenAI) vs ChatGPT
Tier-list head-to-head. ChatGPT takes the A-tier slot — here's the breakdown.
Last reviewed May 19, 2026· sweep-fresh
Spec sheet
At a glance
| Codex (OpenAI) | ChatGPT | |
|---|---|---|
| Tier | A-tier | A-tierwin |
| Overall score | 8.3 / 10 | 8.8 / 10win |
| Powered by | GPT-5.2-Codex (default 2026-04-23) / GPT-5.5 / GPT-5.4 | — |
| Free tier | Yes | Yes |
| Starting price | $0 | $0 |
| Best for | Developers already paying for ChatGPT Plus who want a coding agent at no extra cost. | Everyone. |
| Last reviewed | 2026-04-25 | 2026-05-19 |
Head-to-head
Score showdown
Rated 1-10 on the same rubric across all 130 tools we cover.
Ease of use+2.0 ChatGPT
Codex (OpenAI)
8.0
ChatGPT
10.0
Output qualityTie
Codex (OpenAI)
8.0
ChatGPT
8.0
ValueTie
Codex (OpenAI)
8.0
ChatGPT
8.0
FeaturesTie
Codex (OpenAI)
9.0
ChatGPT
9.0
Overall+0.5 ChatGPT
Codex (OpenAI)
8.3
ChatGPT
8.8
What you'll pay
Pricing snapshot
Look past the headline number -- entry-tier limits drive most cost surprises.
ChatGPT
Free tier available
- Free$0
- Go$8/mo
- Plus$20/mo
Benchmark Head-to-Head
GPT-5.2-Codex (launched 2026-04-23 -- SOTA on SWE-Bench Pro and Terminal-Bench 2.0; first-party scores below pending detailed third-party verification) vs GPT-5.5 (launched 2026-04-23; scores below are the GPT-5.4 baseline -- GPT-5.5 launch benchmarks per OpenAI are logged in Known Issues, pending third-party verification)
| Benchmark | Codex (OpenAI) | ChatGPT |
|---|---|---|
| SWE-bench | 72% | 72% |
| HumanEval | 95% | 95% |
The decision
Which should you pick?
Use-case anchors and category strengths, side by side.
Pick Codex (OpenAI)if…
A
8.3/10- ✓Developers already paying for ChatGPT Plus who want a coding agent at no extra cost.
- ✓Especially good for parallel task execution -- assign multiple bug fixes or feature branches and let Codex work them simultaneously.
Developers already paying for ChatGPT Plus who want a coding agent at no extra cost. Especially good for parallel task execution -- assign multiple bug fixes or feature branches and let Codex work them simultaneously.
Visit Codex (OpenAI)Pick ChatGPTif…
A
8.8/10- ✓Easier to learn and use day-to-day -- friendlier onboarding curve
- ✓Seriously -- if you're new to AI or want the most complete all-in-one package, ChatGPT is the default recommendation.
Everyone. Seriously -- if you're new to AI or want the most complete all-in-one package, ChatGPT is the default recommendation.
Visit ChatGPTBottom line
The verdict
ChatGPT edges out Codex (OpenAI) by 0.5 points (8.8 vs 8.3) -- a A-tier vs A-tier split that's narrow but real. Not a blowout; both belong on a shortlist. The score gap shows up most clearly in the categories that matter for ChatGPT's strengths, so if those categories are your priority, the lead translates.
Pricing-wise, both tools have a free tier (Codex (OpenAI) starts $0, ChatGPT starts $0), so you can test either without committing. Compare what each free tier actually unlocks -- usage caps, model access, and feature gates differ a lot more than the headline price suggests, especially as both vendors have tightened limits in 2026.
By use case: pick Codex (OpenAI) when developers already paying for chatgpt plus who want a coding agent at no extra cost. Pick ChatGPT when everyone. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in ChatGPT's lane, the tier-list ranking and the use-case fit point the same direction; if you're in Codex (OpenAI)'s lane, the score gap matters less than the fit.
Bottom line: ChatGPT is the safer default for most readers, but Codex (OpenAI) is competitive enough that the tie-breaker is your specific workload, not the spec sheet.
Keep digging
Compare more & explore
Full Codex (OpenAI) review
Tier A · 8.3/10
Full ChatGPT review
Tier A · 8.8/10
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Built from our daily AI-tool sweep, last touched May 19, 2026. Honest tier-list reviews — no affiliate-link pieces disguised as advice. See the rubric or how we review.