## Best UI/UX design model in the OpenCode Go subscription **Short answer: Muse Spark 1.3 (the "Contributor" variant in Go).** Closest alternative is **Kimi K3**, and the best cheap option is **MiMo-V2.5-Pro**. There's no official "UI/UX design" ranking published inside OpenCode Go itself — Go's own list is just models + pricing ([opencode.ai/docs/go](https://opencode.ai/docs/go/)), so this is a synthesis of third‑party design benchmarks mapped onto Go's current model list. ### What's actually in the Go subscription Per the official [Go docs](https://opencode.ai/docs/go/) and [models.dev](https://models.opencode.ai/providers/opencode-go/), Go's ~30–34 models include: Muse Spark 1.3 Contributor, Muse Spark 1.2 Contributor, Kimi K3, Kimi K2.7 Code, Kimi K2.6, MiMo-V2.5 / V2.5-Pro / V2.6-Flash / V2.6-Pro, Qwen3.8 Max / Qwen3.8 Flash / Qwen3.7 Plus, DeepSeek V4 Pro / V4.1 Flash / V4 Flash, Grok 4.5–4.7, GLM-5.2 / 5.3 / 5.3-Flash, GPT-5.6 Luna, GPT-6 Luna, MiniMax M3 / M2.7, LongCat, Hy3, Hy4 preview, Space Bunny. ### Why Muse Spark 1.3 - On **Design Arena's website Elo** — head‑to‑head blind human votes on generated real UI/web pages — **Muse Spark 1.3 ranks #1 at 1364**, ahead of Kimi K3 (1344) and GPT-6 Astra (1338). modelgrep notes its ~20‑point lead means it wins ~53 of 100 head‑to‑head votes against Kimi K3 ([modelgrep.com/best/design](https://modelgrep.com/best/design)). Muse Spark 1.3 *is* available in Go as `meta/muse-spark-1.3-contributor`. - Caveat: this is one arena's methodology. A different arena (**LLM-Stats' Website Arena**) crowns **GPT-5.6 Sol** (not in Go) at #1; its top *Go‑available* pick is **MiMo-V2.5-Pro** (#5, score 1,138) ([llm-stats.com/best-ai-for-ui-design](https://llm-stats.com/best-ai-for-ui-design)). So "best" is genuinely benchmark‑dependent. ### Runner-up: Kimi K3 - #2 on the Design Arena website board (#1 open-weight model per modelgrep), and Startrise's 353‑build frontend benchmark ranked it **2nd overall and the "cleanest code"** of the field — a good proxy for mergeable, production‑quality UI code ([startrise.io/blog/best-llm-for-frontend](https://www.startrise.io/blog/best-llm-for-frontend/)). It's in Go as `moonshotai/kimi-k3`. ### Cheapest credible option: MiMo-V2.5-Pro - Ranked #5 for UI design in the Website Arena at $0.43/$0.87 per 1M tokens — the lowest-cost model near the top of that board ([llm-stats.com](https://llm-stats.com/best-ai-for-ui-design)). In Go as `mimo-v2.5-pro`. ### Important caveats - The #1 models on several other design/frontend benchmarks — **Claude Opus 5/5.5, GPT-5.6 Sol, GPT-6 Astra** — are **not** in the Go subscription, so they can't be the answer here ([startrise.io](https://www.startrise.io/blog/best-llm-for-frontend/), [modelgrep](https://modelgrep.com/best/design)). - GenDesigns' UI/UX test ([gendesigns.ai](https://gendesigns.ai/blog/best-llm-for-ui-ux-design)) measured markup density and icon output only and **explicitly did not score visual quality**, so it shouldn't be used to declare a design winner. **Bottom line:** if you want the single best UI/UX/frontend model currently usable on OpenCode Go, go with **Muse Spark 1.3 (Contributor)**, with **Kimi K3** as the strongest all‑round alternative and **MiMo-V2.5-Pro** as the budget pick.