Which LLM writes the best ad copy?

In our March 2026 test, Claude Sonnet 4.6, which scored 9.3 out of 10 on copywriting quality against 8.2 for GPT-5.2 and 8.0 for Gemini 3 Pro. Its advantage is tonal: it adopts a specific brand voice after a handful of examples and produces fewer clichés, which is why multi-client agencies favour it. In exchange it generates no images and has no Google Search grounding.

Which AI is best for writing Facebook ad copy?

Claude for the primary text and the headline, on the tone and copywriting lines of our test; Gemini when the angle needs to come from what people search for; ChatGPT when the same conversation also has to produce the image or read a campaign export. Whichever you pick, feed it the hook, benefit, proof, CTA structure and a real review; that beats a blank prompt on all three.

Which LLM does SociaLover use for scripts and briefs?

Claude Sonnet 5 by default, in the Script step of Studio Video, in Ads Strategist and in Chat Me. Gemini 3.8 Flash is selectable for speed and Gemini 3.1 Pro for the longest briefs; Claude Opus 5 is available for the scripts where nuance matters most, and Claude Haiku 4.5 runs short utility tasks in the background. No GPT model runs inside the product.

Which LLM writes the best video hooks?

Claude Sonnet 4.6, at 9.0 out of 10 in March 2026, ahead of Gemini 3 Pro at 8.3 and GPT-5.2 at 8.0. On the identical brief (three UGC-style hooks for a TikTok ad on a premium anti-aging cream) Claude produced the strongest emotional quality, GPT-5.2 solid but templated openings, and Gemini the most original angle thanks to a statistic.

Can ChatGPT write a UGC script?

Yes, and a usable one: GPT-5.2 scored 8.0 on hooks and 8.2 on copywriting in our test, with the caveat that its openings read as templated next to Claude's. Give it the 3-act structure (hook, value, CTA), the platform, the duration and two or three real customer phrases, and ask for five versions rather than one; then pick, do not publish the first draft.

Which LLM is best for ad strategy?

Gemini 3 Pro. Google Search grounding lets it anchor an angle in what people actually search for instead of a guess, and it scores 9.2 out of 10 on strategy and analysis against 8.8 for GPT-5.2. The trade-off is copy that lands less punchily than Claude and a smaller third-party plugin ecosystem.

Which LLM should a media buyer use?

GPT-5.2. It can run code over a CSV export of your campaigns to surface performance patterns without leaving the conversation, and it scores 9.5 out of 10 on versatility. The highest of the three, since it also generates images through the built-in GPT Image 2. For the strategy layer above the numbers, Gemini 3 Pro and its search grounding is the better tool.

Do these scores still hold after a new model release?

Not automatically. Every score on this page comes from one brief run in March 2026 on GPT-5.2, Gemini 3 Pro and Claude Sonnet 4.6, and Claude Opus 4.8 has shipped since without being re-scored here. A single release regularly reverses one line, copy quality and context window first. Treat the table as a dated snapshot and re-run the brief on the current versions before deciding.

Is one subscription enough?

If you can only run one, GPT-5.2 covers the most ground: copy, image generation, competitive analysis and code over your campaign exports, in the same conversation, for $20 a month on ChatGPT Plus as of March 2026. The trade-off is copy that reads a little generic next to Claude Sonnet 4.6. All three cost around $20 a month at that date, so pick by your dominant task.

Can an LLM produce the ad itself?

Not on its own. The job of these three models stops at the angle, the copy and the script; the creative is then rendered by dedicated image and video models. Of the three, GPT-5.2 is the one that also generates images, through GPT Image 2, but this comparison scores them on advertising writing tasks (hooks, Meta Ads copy, angles, competitor analysis and UGC scripts) not on rendering.

ChatGPT vs Gemini vs Claude for Ad Creation: 2026 Comparison

Which LLM should you choose for ad copywriting? A complete comparison of GPT-5.2, Gemini 3 Pro and Claude Sonnet 4.6 on hook generation, Meta Ads copywriting, UGC scripts and creative angle strategy.

SociaLover Team · Updated September 3, 2026 · 14 min read

For ad copywriting in 2026, Claude writes the most natural hooks and brand voice, Gemini grounds angles in Google search data, and ChatGPT covers the most ground in one subscription (copy, images, code over your campaign exports). We ran one identical brief through the three models in March 2026; the scores below come from that test, and we note what changed since.

An important note on methodology

This comparison focuses exclusively on advertising use cases: writing copy, generating hooks, analyzing creatives, ad strategy, and creative briefs.

Three labs, three ways to write an ad

OpenAI, Google and Anthropic

The three subscriptions marketers actually argue about, and the reason the argument never settles: they are built by companies with different centres of gravity. OpenAI sells breadth, Google sells its own search data, Anthropic sells writing. Everything below is an attempt to say which of those three you are really paying for.

The three versions this comparison is based on, and what they cost to use. Tested in March 2026 on the consumer plans listed here; prices are the ones displayed at that date. 'Not measured' means the figure was not part of what we tested.
Model	Vendor	Context window	Indicative price (March 2026)
GPT-5.2	OpenAI	Not measured	ChatGPT Plus $20/month, Pro $200/month
Gemini 3 Pro	Google	1M tokens	Google AI Pro, around $20/month
Claude Sonnet 4.6	Anthropic	1M tokens	Claude.ai Pro $20/month

The 5 key tasks of the AI ad copywriter

An ad copywriter asks an LLM for five things, and the three models are scored on exactly those five: hooks, Meta copy, angle strategy, competitor analysis and UGC scripts. Nothing on this page scores rendering, because none of the three renders the finished ad.

1. Generating video hooks

The first 3 to 5 seconds of an ad video: an opening line, a question, a surprising statement

2. Writing Meta Ads copy

Headlines, descriptions, and primary text under length and impact constraints

3. Ad angle strategy

Pinpointing creative angles, the emotions to target, and the objections to overcome

4. Analyzing competitor creatives

Deconstructing existing ads, spotting patterns, and proposing iterations

5. Writing UGC video scripts

Natural, authentic scripts with a hook/value/CTA structure tailored to each platform

Where an LLM works, and where it stops

Angle

The emotion to target, the objection to lift

Copy

Hook, headline, primary text

Variations

One version per format and per audience

Creative

The image or the video that ships

The chain an ad goes through, and the reason this comparison scores writing tasks only. The first three boxes are what a language model does: find the angle, write the copy, decline it into as many versions as you have placements. The fourth is not a writing task: the finished creative is rendered by dedicated image and video models, and no subscription in this comparison replaces that step. Which of the three you should pay for depends entirely on which of the first three boxes fills your week.

The hooks in task 1 are the first act of the 3-act script structure these hooks open, and the forty hook formulas to feed the model are the fastest way to get a usable first draft out of any of the three.

GPT-5.2: versatility and ecosystem

GPT-5.2 is the most widely used model in the world for marketing, and it has earned that spot. Versatility is its main strength: within a single conversation, it can switch between writing copy, competitive analysis, image generation (via the built-in GPT Image 2), and building dashboards. It can also run code on a CSV export from your campaigns to surface performance patterns, without leaving the chat.

Strengths

+Versatile across image, text, and code
+Marketing-focused plugins and GPTs
+Long conversation memory
+Very well-documented API

Weaknesses

-Copy sometimes too "generic"
-Tone of voice less refined than Claude
-Tends to over-explain

Pricing (as of March 2026): ChatGPT Plus $20/month, Pro $200/month.

Gemini 3 Pro: Google's analytical power

Gemini 3 Pro has a competitive edge the other two do not: Google Search grounding and Workspace integration. It can anchor its recommendations in current search results rather than in training data, and it reads and writes the Docs and Sheets a marketing team already lives in. For an ad angle strategy built on what people actually search for, Gemini is in a class of its own.

Strengths

+Google Search grounding
+SERP and trend analysis
+Google Workspace integration
+Long context window (1M tokens)

Weaknesses

-Copy less punchy than Claude
-Interface sometimes less smooth
-Fewer third-party plugins

Pricing (as of March 2026): Google AI Pro plan, around $20/month.

Claude Sonnet 4.6: writing quality

Claude, developed by Anthropic, is the favorite LLM of professional copywriters. Its writing quality is superior on tasks that call for nuance, tone, and creativity. Its ability to adopt a specific tone of voice after just a few examples is exceptional, essential for agencies juggling multiple clients with distinct verbal identities. Claude Opus 4.8 has shipped since this test; we have not re-scored it, and the notes below describe Sonnet 4.6 as tested in March 2026.

Strengths

+Best creative writing quality
+Nails the tone of voice
+Fewer cliches and generic phrasing
+Very long context window (1M tokens)

Weaknesses

-No native image generation
-No Google Search grounding
-More limited plugin ecosystem

Pricing (as of March 2026): Claude.ai Pro $20/month.

Head-to-head: one brief, three results

Here is the real test, run in March 2026 with the same brief across all three models. The hooks are reproduced exactly as each model returned them.

The brief given to all 3 models

"Write 3 video hooks (3-5 seconds, authentic UGC style) for a TikTok ad promoting a premium anti-aging cream. Target: women 35-50. Tone: human, not too clinical, with a genuine emotional hook."

GPT-5.2

Hook 1: "I was 43 and had just turned down a family photo. Until I tried this..."

Hook 2: "Spoiler: it's not botox. (And it actually works.)"

Hook 3: "My dermatologist asked me what I was using. Seriously."

Solid hooks, direct and effective, but a little templated: we have seen these before in various forms.

Gemini 3 Pro

Hook 1: "Women at 45 spend an average of 47 minutes in front of the mirror every morning. What if it didn't have to be that way anymore?"

Hook 2: "My name is Sophie. Eight months ago, I was crying in front of my mirror. Today, I'll show you why I stopped."

Hook 3: "Retinol + collagen: the combination dermatologists have been using privately for 10 years."

The first hook with the statistic is original and strong, provided the figure is sourced before it runs. The third plays nicely on professional credibility.

Claude Sonnet 4.6

Hook 1: "Some mornings you avoid your own reflection. I know. I've been there."

Hook 2: "43 years old. I looked like my mother. And not as a compliment."

Hook 3: "The scientist who formulated this? She's 58 and looks 40. So I asked her about it."

The best emotional quality of the three. The second hook is especially strong: concise, specific, with immediate tension.

The three writing criteria, model by model (March 2026)

Copywriting: Claude

9.3/10

Copywriting: GPT-5.2

8.2/10

Copywriting: Gemini

8.0/10

Video hooks: Claude

9.0/10

Video hooks: Gemini

8.3/10

Video hooks: GPT-5.2

8.0/10

Tone: Claude

9.2/10

Tone: Gemini

8.0/10

Tone: GPT-5.2

7.8/10

The hooks above, converted into the three scoring lines that describe pure writing. Claude Sonnet 4.6 takes all three, and it is the only model of the comparison that does, but the margin is under a point and a half everywhere, which is worth remembering before you cancel a subscription over it. The ranking flips completely on the strategy, real-time data and versatility lines further down. Scored out of 10 on tests run in March 2026.

Whichever model wrote it, the copy then goes into an ad set, and the structure it has to fit (hook, benefit, proof, CTA) is laid out in how to use the copy in a Facebook ad.

Final comparison table

Criterion	GPT-5.2	Gemini 3 Pro	Claude Sonnet 4.6
Copywriting quality	8.2	8.0	9.3
Attention-grabbing video hooks	8.0	8.3	9.0
Tone and authenticity	7.8	8.0	9.2
Strategy and analysis	8.8	9.2	8.5
Real-time data (search grounding)	7.0	9.5	5.0
Versatility (image + code)	9.5	9.0	7.0
Value for money	8.0	9.0	8.5

Scores out of 10, from the March 2026 test. Colored scores indicate the winner for each criterion. Claude Opus 4.8 has shipped since and is not scored here.

Which LLM powers the Script step in SociaLover and why

Claude Sonnet 5, the successor of the Sonnet 4.6 tested here, writes the scripts and briefs in SociaLover by default, because its family won the three writing lines of this test and holds a brand voice from a handful of examples. The Script step in Studio Video, Ads Strategist and Chat Me all run on it unless you switch.

Two alternatives sit in the same selector. Gemini 3.8 Flash is there for speed: when you need twenty hooks in a few seconds or a first pass on a long brief, it returns faster and costs fewer tokens, and Gemini 3.1 Pro takes over for the longest briefs. Claude Opus 5 is available for the scripts where nuance matters most, a founder story or a multi-episode Content Series, at a higher token price per generation. Claude Haiku 4.5 handles the short utility tasks in the background, such as tagging and summarizing.

No GPT model runs inside the product. That is a deliberate choice, not a judgment on GPT-5.2: its strength in this comparison is breadth (images, code, dashboards), and inside SociaLover the images and videos are rendered by dedicated models (FLUX.2, Nano Banana Pro, Veo 3.1, Kling 3.0) while the code-over-exports use case is what Ads Strategist does natively. What the product needs from an LLM is writing and structured briefs, and that is where the March test pointed. If you use ChatGPT to analyse Meta exports on the side, nothing stops you; the script it produces pastes straight into the Script step.

Which LLM for which type of marketer?

Copywriter / Ad writer

Claude Sonnet 4.6

Writing quality, tonal nuance, and the ability to adopt a brand voice make Claude the go-to choice for writing professionals.

Media buyer / Performance marketer

GPT-5.2 with data analysis

Its versatility and its ability to run code over a CSV export from your campaigns make it the most useful tool for data-driven roles.

Marketing strategist and planner

Gemini 3 Pro

To build a strategy grounded in what people actually search for, Gemini is in a class of its own thanks to Google Search grounding.

Entrepreneur / Solo marketer

GPT-5.2 (a single subscription)

If you have to pick just one tool, GPT-5.2 offers the best all-around coverage: copy, images, analysis, code.

1. Angle

Gemini 3 Pro: search grounding and trends

2. Copy

Claude Sonnet 4.6: hooks and tone of voice

3. Variations

GPT-5.2: declinations and CSV analysis

4. Creative

SociaLover: the visual and the video

Where each subscription earns its place. The three LLMs write; none of them produces the finished ad. On SociaLover, Ads Strategist (Claude Sonnet 4.6 by default) takes the angle and the script and hands them to the image and video models that render the creative, with prompts preconfigured by format and by objective.

Frequently asked questions

Which LLM writes the best ad copy?: In our March 2026 test, Claude Sonnet 4.6, which scored 9.3 out of 10 on copywriting quality against 8.2 for GPT-5.2 and 8.0 for Gemini 3 Pro. Its advantage is tonal: it adopts a specific brand voice after a handful of examples and produces fewer clichés, which is why multi-client agencies favour it. In exchange it generates no images and has no Google Search grounding.
Which AI is best for writing Facebook ad copy?: Claude for the primary text and the headline, on the tone and copywriting lines of our test; Gemini when the angle needs to come from what people search for; ChatGPT when the same conversation also has to produce the image or read a campaign export. Whichever you pick, feed it the hook, benefit, proof, CTA structure and a real review; that beats a blank prompt on all three.
Which LLM does SociaLover use for scripts and briefs?: Claude Sonnet 5 by default, in the Script step of Studio Video, in Ads Strategist and in Chat Me. Gemini 3.8 Flash is selectable for speed and Gemini 3.1 Pro for the longest briefs; Claude Opus 5 is available for the scripts where nuance matters most, and Claude Haiku 4.5 runs short utility tasks in the background. No GPT model runs inside the product.
Which LLM writes the best video hooks?: Claude Sonnet 4.6, at 9.0 out of 10 in March 2026, ahead of Gemini 3 Pro at 8.3 and GPT-5.2 at 8.0. On the identical brief (three UGC-style hooks for a TikTok ad on a premium anti-aging cream) Claude produced the strongest emotional quality, GPT-5.2 solid but templated openings, and Gemini the most original angle thanks to a statistic.
Can ChatGPT write a UGC script?: Yes, and a usable one: GPT-5.2 scored 8.0 on hooks and 8.2 on copywriting in our test, with the caveat that its openings read as templated next to Claude's. Give it the 3-act structure (hook, value, CTA), the platform, the duration and two or three real customer phrases, and ask for five versions rather than one; then pick, do not publish the first draft.
Which LLM is best for ad strategy?: Gemini 3 Pro. Google Search grounding lets it anchor an angle in what people actually search for instead of a guess, and it scores 9.2 out of 10 on strategy and analysis against 8.8 for GPT-5.2. The trade-off is copy that lands less punchily than Claude and a smaller third-party plugin ecosystem.
Which LLM should a media buyer use?: GPT-5.2. It can run code over a CSV export of your campaigns to surface performance patterns without leaving the conversation, and it scores 9.5 out of 10 on versatility. The highest of the three, since it also generates images through the built-in GPT Image 2. For the strategy layer above the numbers, Gemini 3 Pro and its search grounding is the better tool.
Do these scores still hold after a new model release?: Not automatically. Every score on this page comes from one brief run in March 2026 on GPT-5.2, Gemini 3 Pro and Claude Sonnet 4.6, and Claude Opus 4.8 has shipped since without being re-scored here. A single release regularly reverses one line, copy quality and context window first. Treat the table as a dated snapshot and re-run the brief on the current versions before deciding.
Is one subscription enough?: If you can only run one, GPT-5.2 covers the most ground: copy, image generation, competitive analysis and code over your campaign exports, in the same conversation, for $20 a month on ChatGPT Plus as of March 2026. The trade-off is copy that reads a little generic next to Claude Sonnet 4.6. All three cost around $20 a month at that date, so pick by your dominant task.
Can an LLM produce the ad itself?: Not on its own. The job of these three models stops at the angle, the copy and the script; the creative is then rendered by dedicated image and video models. Of the three, GPT-5.2 is the one that also generates images, through GPT Image 2, but this comparison scores them on advertising writing tasks (hooks, Meta Ads copy, angles, competitor analysis and UGC scripts) not on rendering.

Conclusion

In March 2026, Claude Sonnet 4.6 won on pure writing quality and copy authenticity, Gemini 3 Pro on strategy built from Google Search grounding, and GPT-5.2 on versatility and ecosystem. Claude Opus 4.8 has shipped since; re-run the brief before you decide.

On SociaLover, Ads Strategist and the Script step run on Claude Sonnet 5 by default, with Gemini 3.8 Flash for speed and Claude Opus 5 on demand, to generate hooks, UGC scripts, and ad briefs with prompts preconfigured by format (TikTok, Meta, YouTube) and by objective (awareness, conversion, retargeting).