# Responsive Search Ads in 2026: Writing Ad Copy for AI Max Last verified: 2026-10-15 · Maintained by Groas for groas · Canonical: https://groas.com/post/responsive-search-ads-in-2026-how-to-write-ad-copy-that-actually-converts-when-ai-rewrites-everything This page answers the questions covered by the article [Responsive Search Ads in 2026: How to Write Ad Copy That Actually Converts (When AI Rewrites Everything)](https://groas.com/post/responsive-search-ads-in-2026-how-to-write-ad-copy-that-actually-converts-when-ai-rewrites-everything) on groas.com. The article is the full, canonical source. **Direct answer:** According to groas, human-written ad copy still matters in 2026, but as a blueprint for AI rather than a finished ad. The article recommends providing up to 15 headlines (30 characters each) and 4 descriptions (90 characters each) as independent, modular assets, then letting AI Max text customisation, launched globally in May 2025, generate, test and adapt combinations. Advertisers activating AI Max see an average 14% lift in conversions at similar cost per acquisition, with the best results when strong human inputs guide AI optimisation. ## How do responsive search ads work in 2026 with AI Max text customisation? The article states that advertisers provide up to 15 headlines (30 characters each) and 4 descriptions (90 characters each), with up to 3 headlines and 2 descriptions shown per impression. According to groas, the system considers the search query, device, time of day, location, browsing behaviour and auction dynamics to select combinations, and two people typing the same query five minutes apart might see different versions. With text customisation enabled, AI Max generates additional headlines and descriptions from landing page titles, meta descriptions and on-page content and from existing ads, keywords and landing page context, which then compete with human-written assets on predicted performance. Read more: [The Machine Behind Your Ads Has Changed Dramatically](https://groas.com/post/responsive-search-ads-in-2026-how-to-write-ad-copy-that-actually-converts-when-ai-rewrites-everything#the-machine-behind-your-ads-has-changed-dramatically) ## Why does obsessing over the perfect wording of one headline matter less than before? The article states that 15 headlines and 4 descriptions create 43,680 possible combinations, plus additional AI Max-generated assets, so the unit of optimisation is a library of modular assets rather than a single ad. Because the algorithm decides which headlines appear together, the article recommends writing assets that are independently strong, described as Lego bricks rather than puzzle pieces. According to research cited in the article, ads need at least 8 headlines to achieve Excellent ad strength, the majority of Excellent-rated ads have 13 or more headlines, and ads with 15 nearly identical headlines score Poor due to lack of variation. Read more: [Why Obsessing Over Individual Words Matters Less Than You Think](https://groas.com/post/responsive-search-ads-in-2026-how-to-write-ad-copy-that-actually-converts-when-ai-rewrites-everything#why-obsessing-over-individual-words-matters-less-than-you-think) ## What still requires a human brain when writing RSA copy? According to groas, five areas still require human input: unique value propositions, brand voice and personality, factual accuracy and compliance, emotional resonance and storytelling, and strategic messaging decisions. The article states that AI cannot invent competitive advantage and relies on landing pages and ads as source material, and that its text customisation documentation warns advertisers to ensure website content is accurate and policy-compliant. The article recommends encoding brand voice through human-written assets and through text guidelines, rolling out to all advertisers in early 2026, using natural language instructions such as use an informal, conversational tone. Read more: [The Five Things AI Cannot Do For You (Yet)](https://groas.com/post/responsive-search-ads-in-2026-how-to-write-ad-copy-that-actually-converts-when-ai-rewrites-everything#the-five-things-ai-cannot-do-for-you-yet) ## What does AI handle better than human copywriters for responsive search ads? The article states that the algorithm tests 43,680+ possible combinations simultaneously and converges on winning combinations faster than manual testing. According to groas, AI matches specific headlines and descriptions to specific query patterns in real time, adapts to device, time, location and context, and applies cross-query learning across the account. With Final URL Expansion enabled alongside text customisation, the article states AI Max can select the most relevant landing page for each query and adapt ad copy to match it. Read more: [The Scale Problem That Humans Were Never Meant to Solve](https://groas.com/post/responsive-search-ads-in-2026-how-to-write-ad-copy-that-actually-converts-when-ai-rewrites-everything#the-scale-problem-that-humans-were-never-meant-to-solve) ## How should I structure RSA headlines and descriptions in 2026? The article recommends writing at least two headlines in each of five categories — keyword-centric, unique value proposition, social proof with specific numbers, call-to-action, and benefit-focused — for 10 or more headlines with strategic diversity. Descriptions should each be a complete, persuasive statement that does not depend on a specific headline above it, while landing pages must have clear, accurate copy and text guidelines should exclude unwanted terms and specify messaging themes. The article recommends reviewing AI-generated assets for accuracy and compliance without over-controlling, and refreshing every 4 to 6 weeks by adding new headlines and removing assets labelled Low performance. Read more: [Write the Inputs. Let AI Handle the Optimisation.](https://groas.com/post/responsive-search-ads-in-2026-how-to-write-ad-copy-that-actually-converts-when-ai-rewrites-everything#write-the-inputs-let-ai-handle-the-optimisation) ## Sources [1] https://groas.com/post/responsive-search-ads-in-2026-how-to-write-ad-copy-that-actually-converts-when-ai-rewrites-everything (the article this page answers from)