OpenAI shipped GPT-5.5, and it's already wired into PlayCode's model picker. Sits next to GPT-5.4, Claude Sonnet 4.6 (the current default Quality model), Claude Opus 4.8, and the rest of the lineup. Pick it the same way you pick any other model. Here's an honest take on when it's the right tool.
Where to find it
Open any PlayCode project, then:
- Click the Menu
- Open Preferences
- Pick AI Model
- Under Quality Model, choose GPT-5.5
What it costs
Per OpenAI's May 2026 rate card, GPT-5.5 charges roughly 2× the per-token price of GPT-5.4 across input, cached input, and output. That works out to about 2× the per-request cost for similar prompts. Real money, not theoretical - if you switch from 5.4 to 5.5, plan on your credit budget shrinking accordingly.
For comparison: on a typical website-build request, 5.5 sits between Claude Sonnet 4.6 (cheapest of the big models) and Claude Opus 4.8 (most expensive). You're paying a premium over Sonnet, but not Opus-level pricing.
What's actually new in 5.5 (per OpenAI)
OpenAI's own migration guide for 5.5 highlights a few things worth knowing if you're switching from 5.4 or Claude:
- More efficient reasoning. 5.5 reaches the same answers with fewer reasoning tokens than 5.4 at the same effort level. In tool-heavy or multi-step jobs, the token savings compound.
- Outcome-first prompting works better than step-by-step instructions. Tell it what you want to be true at the end (success criteria, output shape, allowed side effects) rather than the path. 5.5 picks the path. This matches our own observation that older models often needed scaffolded "do A, then B, then C" prompts where 5.5 just does the right thing from a one-line brief.
- Stronger tool use, especially on large tool surfaces. More precise tool selection and argument use. For PlayCode this matters: the agent has ~30 tools, and 5.5 tends to pick the right one without flailing.
- More polished, more direct tone. 5.5 tends to write warmer, more readable answers with less prompt scaffolding. Conversely it's also more concise — if you want chattier responses, ask explicitly.
- Image inputs preserve more detail by default. When you drop a screenshot in, 5.5 sees more of it (up to ~10MP) without aggressive resizing. Useful for redesigning from a reference image.
- Reasoning effort defaults to medium in OpenAI's API. PlayCode passes that default through, which is the right balance of quality vs latency for most website tasks.
Net for picking it in PlayCode: try 5.5 on tasks where you'd otherwise need to write a detailed prompt to get a good Claude result. 5.5's instinct for "what success looks like from a short brief" is its strongest trait. For pure visual design work, Claude Opus is still our pick.
Why we haven't made it the default
No model wins every category. We default to Claude Sonnet 4.6 because it consistently produces clean, well-balanced website work at a per-request cost that fits the credit economy on every Pro plan. GPT-5.5 is a strong alternative — particularly for users who prefer the OpenAI family or have built up a feel for prompting it — but "strong alternative" isn't enough to flip the default for everyone.
The honest version: we keep adding models so you can A/B them against your usual pick on the actual thing you're building. We do this rather than crown one winner because the right choice depends entirely on what's on your screen right now.
An honest note about every AI model in 2026
A pattern we see across every model — including the strongest ones — is the same set of complaints:
- Sometimes it does too much. You ask for one change and it touches three files.
- Sometimes it's slow. Especially on the largest reasoning models when the project is big.
- Sometimes it misses the obvious thing. Different models miss different obvious things.
No model in production today fully solves any of these. Even Claude Opus, which in our testing still produces the most polished UI work of any model available, will occasionally take its time and over-engineer a simple request. GPT-5.5 has its own version of these behaviors. So does Sonnet. So does Gemini.
The practical move: when output quality matters — a hero section for a paying client, a landing page you'll show your team — run the same prompt across two or three models and look at the results. We've built the model picker to make that switching painless. You'll usually have a clear preference within thirty seconds of comparing.
Quick model-by-model take
- Claude Sonnet 4.6 (default) - Best balance of quality, cost, and speed for typical landing pages and small sites. Start here.
- Claude Opus 4.8 - Highest-quality UI and design work. Slowest, most expensive. Pull it out for important pages.
- GPT-5.5 (new) - OpenAI's strongest general-purpose model. Roughly 2x the per-request cost of 5.4 - worth it when GPT's reasoning lands better than Claude's on the specific task in front of you, but not the default you'd run a whole project on.
- GPT-5.4 - Half the cost of 5.5, still a strong general-purpose choice. Default GPT pick for most work.
- GPT-5.3 Codex - OpenAI's specialized builder for raw code-first work.
- Gemini 3.1 Pro - Best for very large projects where context window matters.
Try GPT-5.5 on a real task today. If it produces a better result than what you usually get, switch. If not, switch back - it takes ten seconds either way.
Open PlayCode at playcode.io and pick the model you want under Preferences. New users get free credits to try the AI website builder before subscribing.