ChatGPT has become more than a novelty, it’s become one of the primary ways buyers research, compare, and choose vendors. Whether it’s Perplexity, Gemini, or ChatGPT, many prospects now find answers without going through Google. Traditional SEO is no longer enough.

To be visible at the moment of intent, brands need SEO tuned for large language models. That’s ChatGPT search optimization: crafting content, structure, and signal so AI tools select you as the answer.

Below is a list of five different consultancies doing just that, along with a description of the methodology for how the list was built:

Methodology

The companies below were selected based upon a combination of factors, including:

  • Experience working with B2B companies, and a history of delivering positive business results

  • Offering of a specific AI search service within their full package of services

  • Frequency and quality of mentions in authoritative reference points, such as industry-recognized websites, user generated content platforms like Reddit, and review websites

  • Boasting unique strengths and buyer profiles relative other companies on the list

1. Mark Sourced

Mark Sourced is a boutique demand capture consultancy, helping B2B companies achieve repeatable pipeline through both traditional and ChatGPT SEO. Founded by Dan Payne, a 15+ year demand generation and SEO leader in the B2B technology space, the firm helps clients build bottom-of-funnel visibility in traditional Google search, and generative engines like ChatGPT and Google’s AI Overviews.

Best for: B2B SaaS companies that want a high-touch partner to build and execute a dedicated AI SEO program.

2. Go Fish Digital

Why they stand out: They're leaders in technical GEO (Generative Engine Optimization), built on data and deep research. Go Fish Digital reverse-engineers how AI systems choose content—publishing studies, leveraging AI retrieval patents, and building tools like AI Overview analyzers and similarity scoring to measure how your content performs against generative results.

Best for: Brands seeking a scientifically rigorous, experimentation-focused path to consistent inclusion in ChatGPT answers.

3. NoGood

What they offer: Recognized for future-proof growth marketing with a strong AEO (Answer Engine Optimization) focus, NoGood blends SEO, content strategy, and performance marketing to optimally position brands for AI-powered search.

Best for: Scale-ups and enterprise brands that want integrated growth marketing with SEO strategies built for AI responsiveness.

4. ResultFirst

Unique approach: Offers a pay-for-performance AI SEO model, charging based on real outcomes like ranking in AI Overviews and driving traffic from generative engines. Services include AI keyword forecasting, content intelligence tools, and intent-first strategies.

Best for: Businesses looking for low-risk, ROI-driven ChatGPT optimization—they only pay when it works.

5. Orainti

Why they're notable: A boutique, results-driven consultancy (based in Madrid) that adapts to each brand’s niche needs. Though smaller, they excel at personalized, high-impact AI SEO programs for globally diverse clients.

Best for: Brands—especially outside the US—seeking tailored, hands-on ChatGPT optimization without the enterprise footprint.

Why This Matters Now

AI chatbots are eating search clicks—and that means zero-click real estate is where your content needs to be. GEO (GPT‑Engine Optimization) is no longer optional; it's how you get seen—or stay invisible.

Each of these consultancies offers a different way in—technical rigor, performance guarantee, boutique agility, or SaaS-focused workflows. Let me know if you’d like a side-by-side comparison table or a one-page media kit-style summary!