Grok
Our pickPerplexity AI
Tier-list head-to-head. Perplexity AI takes the A-tier slot — here's the breakdown.
Spec sheet
| Grok | Perplexity AI | |
|---|---|---|
| Tier | B-tier | A-tierwin |
| Overall score | 7.5 / 10 | 8.5 / 10win |
| Free tier | Yes | Yes |
| Starting price | $0 | $0 |
| Best for | People who live on X/Twitter and want an AI that can tap into that data in real-time. | Researchers, students, professionals, and anyone who needs factual answers with sources. |
| Last reviewed | 2026-05-19 | 2026-04-18 |
Head-to-head
Rated 1-10 on the same rubric across all 130 tools we cover.
Vibe check
How each tool actually sounds when you talk to it.
“The irreverent contrarian”
“The citation-first researcher”
What you'll pay
Look past the headline number -- entry-tier limits drive most cost surprises.
Free tier available
Free tier available
Grok 4.20 benchmarks — Perplexity AI has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| MMLU | Knowledge across 57 subjects | 88.5% |
| GPQA Diamond | Graduate-level science questions | 85% |
| HumanEval | Python code generation | 90% |
| Humanity's Last Exam | Frontier difficulty questions | 50.7% |
The decision
Use-case anchors and category strengths, side by side.
People who live on X/Twitter and want an AI that can tap into that data in real-time. Also good for users who find mainstream chatbots too sanitized and want something with more personality.
Visit GrokResearchers, students, professionals, and anyone who needs factual answers with sources. It's what Google should have become.
Visit Perplexity AIBottom line
Perplexity AI is the clear winner: 8.5/10 (A-tier) versus 7.5/10 (B-tier). Grok isn't a bad tool, but on every category that drives the overall score, Perplexity AI comes out ahead. The tier gap is repeatable -- not methodology noise -- and the day-to-day experience reflects it.
Pricing-wise, both tools have a free tier (Grok starts $0, Perplexity AI 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 Grok when people who live on x/twitter and want an ai that can tap into that data in real-time. Pick Perplexity AI when researchers, students, professionals, and anyone who needs factual answers with sources. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in Perplexity AI's lane, the tier-list ranking and the use-case fit point the same direction; if you're in Grok's lane, the score gap matters less than the fit.
Bottom line: Perplexity AI is the better tool for most people right now. Pick Grok only when people who live on x/twitter and want an ai that can tap into that data in real-time -- that's its lane, and inside that lane it still earns its place.
Keep digging
Full Grok review
Tier B · 7.5/10
Full Perplexity AI review
Tier A · 8.5/10
Grok alternatives
Other tools in this lane
Perplexity AI alternatives
Other tools in this lane
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.