Which Claude model is best for web design?

"Which Claude model should I use?" sounds like it needs a benchmark. For web design it mostly doesn't. All four current models write good HTML and CSS. What separates them is how well they hold a whole site in their head over a long session, how precisely they read a screenshot, how fast they answer, and what each run costs.

This guide matches the current models to the actual jobs in a web project. The facts about each model come from Anthropic's own models overview and migration guides, as of November 2026. We haven't run our own benchmark, so you won't find invented scores here.

The four current Claude models at a glance

All four take text and images as input and have a context window of one million tokens, which Anthropic puts at roughly 555,000 words. That is more than enough to read every file of a typical small business site at once, so context size is not a reason to pick one model over another here.

The per-token prices apply when you use Claude through the API. On a claude.ai or Claude Code subscription you pay a flat plan price instead, so check your plan for which models it includes.

Which model for which web design job

Opus 5.5: the default for design and building

Designing a site is rarely one prompt. It's a session: read the brief, plan the pages, write the layout, check it at phone width, fix the header, repeat. That's the kind of work Anthropic built Opus 5.5 for. In Anthropic's own testing, at its default effort it matched or beat the previous Opus on multistep coding tasks in a real codebase, with fewer steps and about half the tokens. It also reads visual input more accurately, which matters when you hand it a screenshot of a design you like and ask for "this, but for a bakery".

Sonnet 5.5: the fast model for small rounds

Once the design stands, most work is small: swap a photo, shorten a headline, tighten the spacing in a section. Sonnet 5.5 answers faster and costs half as much per token, and for changes like these you won't notice a quality difference that's worth waiting for. Anthropic's own note: for the hardest long-horizon work, an Opus model is the better choice.

Fable 5.1: only when Opus 5.5 isn't enough

Fable 5.1 is Anthropic's most capable widely released model, and it costs two and a half times as much per token as Opus 5.5. Anthropic's own advice is to use it for demanding, long-horizon work, or when Opus 5.5 at a higher effort setting still falls short. For a five-page site that's rarely the case. For a large redesign of a site with dozens of templates, it can be.

Haiku 5.5: not a designer

Haiku 5.5 is made for high-volume, fast tasks. Writing alt texts for 200 images, a meta description for every page, or sorting a content inventory are good fits. Designing a layout is not.

What a typical job costs on the API

The cost of a run is the tokens Claude reads plus the tokens it writes. Thinking is billed as output, even when you don't see it. Take a task where Claude reads 80,000 tokens (about 44,000 words of files and instructions) and writes 10,000:

Two things change the real number. First, context Claude has already read can come from the prompt cache, and on Opus 5.5 and Sonnet 5.5 a cache read costs 5% of the normal input price. Second, judge the cost per finished job, not per request. A cheaper model that needs three extra rounds to get the header right isn't cheaper.

Effort is the other lever. It sets how much the model thinks before it answers. Opus 5.5 defaults to medium and Sonnet 5.5 to high. For a full redesign, raise it; for a typo, lower it.

Every model has a default look, and the fix is the same

This matters more for design than the choice of model. Asked for a website without design direction, Claude falls back on a few default styles. Anthropic says so in its own migration guides, and it adds a detail worth knowing: a general instruction like "avoid a generic AI look" mostly swaps one default for another. What works is naming the specific patterns you don't want, for example:

"Don't use a cream or off-white background, italic accent words in headlines, numbered 01/02/03 section labels or pill-shaped buttons."

Look at what the first result used, add it to the list and run it again. Asking for three or four distinct visual directions before it builds anything works too. Then you pick one, and only that one gets built.

A design skill does this work for you and does it more thoroughly. Our comparison of the best Claude Skills for web design covers what each one changes, and the guide to the impeccable skill shows how to install and use the most thorough of them. A skill loads the same way on every model, so you can pair it with whichever model you picked.

How to switch models

• Claude Code: type /model in the session and pick the model. You can switch mid-project, for example Opus 5.5 for the build and Sonnet 5.5 for the small fixes afterwards.
• claude.ai: choose the model in the chat's model picker before you send.
• API: set the model ID: claude-opus-5-5, claude-sonnet-5-5, claude-fable-5-1 or claude-haiku-5-5.

New to building a site this way? Our step-by-step guide to building a website with Claude Code covers the setup, and Claude vs ChatGPT for websites compares the two if you haven't settled on Claude yet.

Once the design is done, publishing a website made with Claude explains how to get it onto your own domain with a form that actually arrives. No site yet? You can describe your business and get a first version that you then change by chat.

Frequently asked questions

The bottom line

Start with Opus 5.5, drop to Sonnet 5.5 for the small rounds, and leave Fable 5.1 for the job that really needs it. Then spend the time you saved on the brief and a good design skill, because that's where most of the quality comes from.