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Buyer's guides

Agent UI & Frontend

Every Agent UI & Frontend comparison and buyer's guide for building AI agents — 12 pieces and counting. Each is a head-to-head or a “best X for Y” roundup with a sources-backed verdict.

The Stack

Route Your Front-End Generation to Kimi K3 Without Self-Hosting 2.8T Parameters

Kimi K3 tops the Frontend Code Arena but is a rack to self-host and priced like a flagship. The right way to capture the win is task-based routing: send only your UI calls to K3, keep everything else where it is. Here's the router, the cost guardrails, and the math.

4 min
The Stack

Ollama v0.32.6 Now Streams Exactly Like OpenAI — So Your Local Agent Client Just Works

The Aug 4 release makes Ollama's /v1/chat/completions streaming match OpenAI's wire format byte-for-byte: role on the first chunk, finish_reason on its own chunk, usage in a separate one. If you kept a fork of your streaming parser for local models, you can delete it.

3 min
The Wire

Kimi K3 Just Topped a Frontend Coding Board Over Every Closed Model. Here's What 1,679 Actually Measures.

Moonshot's open-weight K3 is the first open model to lead a public web-engineering leaderboard, edging Claude Fable 5 and GPT-5.6 Sol. The milestone is real. Before you rip out your coding model, read what the number counts — and the four things it doesn't.

4 min
The Wire

vLLM Rewrote Its Frontend in Rust — and the GPU Was Never the Bottleneck

One Rust process now matches 32 Python API servers. The lesson isn't 'Rust is fast' — it's that everyone was optimizing the wrong layer of the serving stack.

4 min
The Wire

Parsing Partial JSON From Streaming Tool Calls: It's a Prefix, Not a Bug

When a model streams a tool call, the arguments arrive as half-written JSON. The teams that struggle treat it as corruption to repair. It's a valid prefix to complete — and the naive fix is quietly O(n²).

5 min
The Stack

Generative UI for Agents: The Repos That Let an LLM Render Real Components

The field for making an agent 'speak UI' has split into two camps — your codebase owns the components, or the protocol does. Which repo you reach for is really a bet on who controls the widget.

6 min
The Wire

Resumable LLM Streaming: How to Survive a Refresh Without Repaying for the Answer

SSE hands you a Last-Event-ID header that looks like free stream resumption. It isn't — it's a cursor with nothing behind it. The real fix is the one decision everything else follows from.

6 min
The Wire

Streaming an AI Agent's Output: Why SSE Beats WebSockets Until It Doesn't

The SSE-vs-WebSockets debate misses the real problem. An agent doesn't emit a token stream — it emits typed events. Design the envelope first; the transport falls out.

4 min
The Wire

AG-UI vs MCP vs A2A: The Protocol That Connects Agents to Users

MCP wired agents to tools and A2A wired them to each other. The last hop — the agent talking to a human's screen — was still hand-rolled in every app. AG-UI is the standard for it.

5 min
The Stack

Streamlit vs Gradio vs Chainlit: Picking a Python UI for Your LLM App

They look like three flavors of the same thing. They're not — each is built around a different execution model, and that hidden choice is what makes streaming chat trivial in one and a fight in the others.

4 min
The Stack

Open WebUI vs LibreChat vs AnythingLLM: Choosing a Self-Hosted AI Chat Front-End

Three self-hosted chat UIs that look interchangeable on a feature checklist — but each one is really built for a different person, and picking the wrong one means fighting the grain forever.

5 min
The Stack

CopilotKit vs assistant-ui vs Vercel AI SDK: Picking an Agent Chat UI in 2026

They all surface when you Google "AI chat UI for agents," but they own three different layers — and the ones worth shipping often stack rather than swap.

5 min

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