AI SEO Benchmark
Digital marketing is being impacted by AI in everyday workflows. But is AI good enough to be trusted for your business? We've designed a unique benchmark for the SEO industry to do just that.
The LLM Leaderboard
Updated Oct 7, 2026
| Language Model | Score (out of 100) | % Diff vs Prev Version | Release Date |
|---|---|---|---|
| Claude Opus 4.6 | 87% | +11% | Feb 5, 2026 |
| ChatGPT-5.4 Pro | 86% | +9% | Mar 5, 2026 |
| ChatGPT-5.6 | 84% | 0% | Jul 9, 2026 |
| ChatGPT-5.5 Pro | 84% | -2% | Apr 23, 2026 |
| Claude Opus 5 | 83% | +16% | Jul 24, 2026 |
| Claude Sonnet 5 | 83% | +1% | Jun 30, 2026 |
| Claude Fable 5.1 | 82% | +5% | Sep 1, 2026 |
| Kimi K2.6 | 82% | n/a | Feb 2, 2026 |
| ChatGPT-6 Astra | 81% | -3% | Sep 3, 2026 |
| Grok 4.6 | 80% | 0% | Aug 12, 2026 |
| Claude Sonnet 5.5 | 80% | -3% | Sep 28, 2026 |
| Claude Opus 5.5 | 80% | -3% | Sep 22, 2026 |
| Gemini 3.6 Flash | 78% | +2% | Jul 21, 2026 |
| Gemini 3.5 Flash | 76% | +7% | May 19, 2026 |
| Perplexity | 76% | +13% | Oct 7, 2026 |
| Meta Muse | 76% | +1% | Jul 9, 2026 |
| Claude Haiku 5.5 | 74% | NEW | Oct 7, 2026 |
| Gemini 3.1 Pro | 74% | +1% | Feb 19, 2026 |
| Deepseek V4 | 73% | -4% | Apr 24, 2026 |
| Claude Opus 4.7 | 70% | -17% | Apr 16, 2026 |
| Claude Opus 4.8 | 67% | -3% | May 28, 2026 |
| Grok 4.7 | 55% | -25% | Sep 21, 2026 |
How We Test AI SEO Performance
- Expert-level SEO questions, updated regularly, focused on in-the-field experience to measure how useful LLMs are at understanding SEO problems.
- The questions are multiple choice and verified by a panel of SEO professionals.
- Based on our test of a sampling of questions with SEO professionals, an expert-level search marketer would be expected to achieve a rating of 89% + considering that SEO professionals typically specialize in one field.
- SAMPLE QUESTION: Instead of manually penalizing sites that are breaking Google's linking policies, Google has started: (select all that apply)
- Deindexing sites
- Not passing their authority to linked sites
- Quietly dropping their overall ranking
- Changing the SERP to show more ads
- - Answer - B & C
Have questions on what this data means to your business? Check out our coverage on Search Engine Land where we will regularly post updates about the progress of LLMs and how it's impacting digital marketing.
David Bell
As co-founder of Previsible, David combines data-driven insights with scalable processes to transform complex marketing initiatives into predictable growth engines.
Buyers ask AI who to trust. We make sure it's you.
We'll explore your goals, your team, your AI visibility, and what it takes to lead.