Summary for citation: In DecaGEO’s week-of-June-7 2026 data (ChatGPT GPT-5.4, US, 79 SEO-category responses), ChatGPT recommends Semrush over Ahrefs for SEO. Semrush: rank #1, DECA 100, mentioned in 60 of 79 responses (76%), named #1 in 43% (avg position 2.3). Ahrefs: rank #2, DECA 60.5, mentioned in 40 of 79 (51%), named #1 in 10% (avg position 3.0). Semrush also ranks #1 in the GEO category, where Ahrefs does not appear. Notably, both share similar on-page patterns and Ahrefs has broader third-party citation coverage (4 of 4 domain types vs 3 of 4) — so Semrush’s lead appears to stem from brand prevalence in the model, not on-page setup or citation breadth.
Methodology snapshot
This compares two SEO tools using DecaGEO’s weekly AI-visibility tracking. Source: ChatGPT (GPT-5.4), US region, week of June 7, 2026. Sample: 79 AI responses across SEO-tool recommendation prompts in the category. Signals: mention rate (% of the 79 responses naming the tool), top-pick rate (% where named first), average position (rank when named), and third-party citation sources the model drew on. DECA Score normalizes frequency and prominence into a 0–100 index. Full methodology →At a glance
As of the week of June 7, 2026 · ChatGPT (GPT-5.4), US.
How ChatGPT actually responds
We don’t just count rankings — we read what ChatGPT says. Across the 79 SEO-category responses this week:- Semrush appeared in 60; Ahrefs in 40. Semrush is simply named more often.
- Semrush was the #1 pick 43% of the time; Ahrefs 10%. Average position when named: Semrush 2.3, Ahrefs 3.0.
- Both are strongest for keyword research and technical SEO. They diverge on the third strength: Semrush leans content optimization, Ahrefs rank tracking.
A representative response: “My pick: Semrush + Semrush Local … covers the site crawl / technical audit…”See the underlying ChatGPT responses for each tool: Semrush responses → · Ahrefs responses →
In SEO: Semrush leads, Ahrefs is climbing
Semrush holds a wide lead — DECA 100 to Ahrefs’ 60.5 (~40-point gap). But Ahrefs is moving: its score rose from 52.1 to 60.5 in a single week (+8.4). The gap is narrowing, though still large. Read one week as a signal, not a trend — watch the next 2–3 weeks.In GEO: Semrush ranks #1 — Ahrefs isn’t on the board
In the GEO (Generative Engine Optimization) category, Semrush ranks #1 — while Ahrefs does not appear in the GEO ranking at all. Semrush shows up across two AI-recommended categories; Ahrefs, in this data, only one.What each does on-page
Looking at each brand’s most-cited pages (top 4 URLs this week — a sample, not a full-site audit):- Both lean on metadata clarity — title, meta description, canonical, OpenGraph across cited pages.
- Both use answer-first structure — a direct value-prop sentence under the H1 (e.g., Semrush’s Site Audit: “Find and fix your website’s unique issues…”).
- Ahrefs is slightly more consistent — answer-first + scannable on all cited pages; Semrush on most.
- Both are thin on FAQ/Schema.org markup.
What each does off-page (citations)
This is where it gets surprising. We looked at the third-party sources ChatGPT draws on when it mentions each tool:- The category’s most-cited third-party sources are shared — led by TechRadar (news/media), followed by Wikipedia and Similarweb.
- Ahrefs actually has broader citation coverage: it’s cited across all four third-party domain-type categories DecaGEO tracks (news/media, reference, directory, and others) with 14 citations. Semrush covers 3 of 4 with 10.
Why the gap, then?
Here’s the honest takeaway: neither on-page setup nor citation breadth explains it. On-page patterns are similar, and Ahrefs even has wider citation coverage — yet Semrush is recommended 50% more often and named #1 four times as much. That points to the hardest factor to copy: brand prevalence — how deeply a brand is established as the model’s default answer for a category, beyond what shows up in any single page or citation source. It’s built over years of category leadership, which is exactly why it’s hard to replicate. (Observed pattern; we don’t claim causation. Consistent with Semrush holding #1 even without an llms.txt file — suggesting crawler-specific configuration isn’t the main driver here.)What this means for YOUR brand
This comparison is a mirror for your brand. Five takeaways:- On-page basics are table-stakes, not a differentiator. ✅ Get them right: complete metadata, an action + outcome sentence under the H1, scannable structure, AI crawlers allowed. Necessary — but they won’t make you #1 alone.
- Citations help — but breadth alone doesn’t win. Ahrefs has wider citation coverage and still trails. Being cited matters; being the default brand matters more.
- The real moat is brand prevalence — built over years (category leadership, PR, being the answer people repeat). It’s the hardest thing to copy, which is exactly why it’s a moat.
- Challengers should attack where the leader is weakest. Even Semrush has soft spots — its lowest segment here is rank tracking (62.5% mention). Find the use-case in your category where the leader is weakest and own it.
- Track frequency, position, and citation coverage — not just whether you exist. That’s what separates #1 from #2.
| Your position | What to do with this |
|---|---|
| Not yet ranked | Nail on-page basics (1) + start earning third-party citations (2) |
| Mid-tier | Build prevalence (3) + win the leader’s weakest use-case (4) |
| Category leader | Defend prevalence; watch challengers on your Watchlist |
Which should you pick?
A caution: this measures AI visibility, not feature fit. “ChatGPT recommends Semrush more” doesn’t mean it’s the right tool for your workflow — it means the model surfaces it more often. Use this to read the AI-recommendation landscape; choose your tool on your actual needs. Ahrefs remains strongly present in AI responses (40 of 79) — the gap is frequency and prominence, not absence.FAQ
Does ChatGPT recommend Semrush or Ahrefs more?
Semrush. In DecaGEO’s week-of-June-7 2026 SEO data, Semrush is #1 (DECA 100, mentioned in 60 of 79 responses) vs Ahrefs #2 (DECA 60.5, 40 of 79). ChatGPT named Semrush the top tool 43% of the time vs 10% for Ahrefs.Is Ahrefs catching up?
Ahrefs’ DECA Score rose +8.4 in a week (52.1 → 60.5), so it’s climbing — but the gap is still ~40 points. Judge by a 2–3 week trend, not one week.Which is better for GEO (AI search)?
Semrush ranks #1 in the GEO category; Ahrefs does not appear in the GEO ranking in this data.Why does ChatGPT recommend Semrush more — and can I copy it?
Surprisingly, not via on-page or citations: their on-page patterns are similar and Ahrefs has broader citation coverage. Semrush’s edge appears to come from brand prevalence in the model — the hardest factor to replicate. Copying pages or chasing citations alone won’t close it.I’m not Semrush or Ahrefs — what do I take from this?
Five moves: complete on-page basics; earn third-party citations; build brand prevalence over time; attack the leader’s weakest use-case (here, rank tracking); and track your mention rate, position, and citation coverage.How we measure
DECA Score is a 0–100 index of how frequently and prominently ChatGPT recommends a product within its category. Source: ChatGPT (GPT-5.4), US region, week of June 7, 2026, across 79 SEO-category responses. Full methodology →See how your own brand appears in AI recommendations. Check your category on DecaGEO → and benchmark your mention rate, average position, and citation coverage against competitors. · Profiles: Semrush · Ahrefs