Mistral AI
Free tier available
- Le Chat (Free)$0
- API (Mistral Small 4)$0.20/per 1M tokens
- API (Mistral Medium 3.5)$1.5 / $7.5/per 1M tokens (input/output)
B
7.5/10Mistral AI
VS
Our pickA
8.3/10Codex (OpenAI)
GPT-5.2-Codex (default 2026-04-23) / GPT-5.5 / GPT-5.4
Mistral AI vs Codex (OpenAI)
Tier-list head-to-head. Codex (OpenAI) takes the A-tier slot — here's the breakdown.
Last reviewed May 4, 2026· sweep-fresh
Spec sheet
At a glance
| Mistral AI | Codex (OpenAI) | |
|---|---|---|
| Tier | B-tier | A-tierwin |
| Overall score | 7.5 / 10 | 8.3 / 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 who want cheap, high-quality API access. | Developers already paying for ChatGPT Plus who want a coding agent at no extra cost. |
| Last reviewed | 2026-05-04 | 2026-04-25 |
Head-to-head
Score showdown
Rated 1-10 on the same rubric across all 130 tools we cover.
Ease of use+2.0 Codex (OpenAI)
Mistral AI
6.0
Codex (OpenAI)
8.0
Output qualityTie
Mistral AI
8.0
Codex (OpenAI)
8.0
Value+1.0 Mistral AI
Mistral AI
9.0
Codex (OpenAI)
8.0
Features+2.0 Codex (OpenAI)
Mistral AI
7.0
Codex (OpenAI)
9.0
Overall+0.8 Codex (OpenAI)
Mistral AI
7.5
Codex (OpenAI)
8.3
What you'll pay
Pricing snapshot
Look past the headline number -- entry-tier limits drive most cost surprises.
Codex (OpenAI)
Free tier available
- Free$0
- Go$8/mo
- Plus$20/mo
Benchmark Head-to-Head
Mistral Medium 3.5 (vendor-published; third-party verification pending) vs 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)
| Benchmark | Mistral AI | Codex (OpenAI) |
|---|---|---|
| HumanEval | 92% | 95% |
The decision
Which should you pick?
Use-case anchors and category strengths, side by side.
Pick Mistral AIif…
B
7.5/10- ✓Better value at the price you'll actually pay (9.0/10 on value)
- ✓Developers who want cheap, high-quality API access.
- ✓Also strong for multilingual applications and European companies that prefer an EU-based AI provider for data residency.
Developers who want cheap, high-quality API access. Also strong for multilingual applications and European companies that prefer an EU-based AI provider for data residency.
Visit Mistral AIPick Codex (OpenAI)if…
A
8.3/10- ✓Easier to learn and use day-to-day -- friendlier onboarding curve
- ✓More feature surface area for power users who'll use the depth
- ✓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.
- ✓Stronger on python code generation (+3.0% on HumanEval)
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)Bottom line
The verdict
Codex (OpenAI) edges out Mistral AI by 0.8 points (8.3 vs 7.5) -- a A-tier vs B-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 Codex (OpenAI)'s strengths, so if those categories are your priority, the lead translates.
Pricing-wise, both tools have a free tier (Mistral AI starts $0, Codex (OpenAI) 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 Mistral AI when developers who want cheap, high-quality api access. Pick Codex (OpenAI) when developers already paying for chatgpt plus who want a coding agent at no extra cost. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in Codex (OpenAI)'s lane, the tier-list ranking and the use-case fit point the same direction; if you're in Mistral AI's lane, the score gap matters less than the fit.
Bottom line: Codex (OpenAI) is the safer default for most readers, but Mistral AI is competitive enough that the tie-breaker is your specific workload, not the spec sheet.
Keep digging
Compare more & explore
Full Mistral AI review
Tier B · 7.5/10
Full Codex (OpenAI) review
Tier A · 8.3/10
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Built from our daily AI-tool sweep, last touched May 4, 2026. Honest tier-list reviews — no affiliate-link pieces disguised as advice. See the rubric or how we review.