diff --git a/src/ifcchat/app.js b/src/ifcchat/app.js
index c0046491b5..7a7eb1adab 100644
--- a/src/ifcchat/app.js
+++ b/src/ifcchat/app.js
@@ -112,13 +112,17 @@ const baseUrlLabelEl = $("baseUrlLabel");
 const baseUrlEl = $("baseUrl");
 const thinkingIndicatorEl = $("thinkingIndicator");
 const modelEl = $("model");
-const providerEl = $("provider");
+const providerEls = document.querySelectorAll('input[name="provider"]');
 const ifcFileEl = $("ifcFile");
 const newBtn = $("newModel");
 const downloadBtn = $("downloadIfc");
 
+function getProviderValue() {
+    return document.querySelector('input[name="provider"]:checked')?.value || "openai";
+}
+
 function onProviderChange() {
-    const provider = PROVIDERS[providerEl.value];
+    const provider = PROVIDERS[getProviderValue()];
     apiKeyLabelEl.innerHTML = `${provider.apiKeyLabel}<span class="small">stored in browser memory; only sent to provider servers</span>`;
     apiKeyEl.placeholder = provider.apiKeyPlaceholder;
     baseUrlRowEl.hidden = !provider.baseUrlDefault;
@@ -133,7 +137,9 @@ function onProviderChange() {
     modelEl.innerHTML = provider.models.map(m => `<option value="${m.value}">${m.label}</option>`).join("");
 }
 
-providerEl.addEventListener("change", onProviderChange);
+for (const providerEl of providerEls) {
+    providerEl.addEventListener("change", onProviderChange);
+}
 onProviderChange();
 
 function setBusy(isBusy, reason = "") {
@@ -467,7 +473,7 @@ async function runAgentTurn(userText) {
     const apiKey = apiKeyEl.value.trim();
     if (!apiKey) throw new Error("Missing API key");
 
-    const provider = PROVIDERS[providerEl.value];
+    const provider = PROVIDERS[getProviderValue()];
     const { chat } = provider.api;
     const baseURL = provider.baseUrlDefault ? baseUrlEl.value.trim() : undefined;
 
diff --git a/src/ifcchat/index.html b/src/ifcchat/index.html
index e919b1ae8f..daf6146126 100644
--- a/src/ifcchat/index.html
+++ b/src/ifcchat/index.html
@@ -14,12 +14,24 @@
         <section class="side">
             <div class="row">
                 <label>Provider</label>
-                <select id="provider" style="width: 100%;">
-                    <option value="openai">OpenAI</option>
-                    <option value="anthropic">Anthropic (Claude)</option>
-                    <option value="gemini">Gemini</option>
-                    <option value="openrouter">OpenRouter</option>
-                </select>
+                <div class="provider-tabs" role="radiogroup" aria-label="Provider">
+                    <label class="provider-tab">
+                        <input type="radio" name="provider" value="openai" checked />
+                        <span>OpenAI</span>
+                    </label>
+                    <label class="provider-tab">
+                        <input type="radio" name="provider" value="anthropic" />
+                        <span>Claude</span>
+                    </label>
+                    <label class="provider-tab">
+                        <input type="radio" name="provider" value="gemini" />
+                        <span>Gemini</span>
+                    </label>
+                    <label class="provider-tab">
+                        <input type="radio" name="provider" value="openrouter" />
+                        <span>OpenRouter</span>
+                    </label>
+                </div>
             </div>
 
             <div class="row">
diff --git a/src/ifcchat/style.css b/src/ifcchat/style.css
index b84fb1fb30..105e0d574f 100644
--- a/src/ifcchat/style.css
+++ b/src/ifcchat/style.css
@@ -32,7 +32,7 @@ main {
 
 .side {
     border-right: 1px solid #ddd;
-    padding: 100px 12px 12px 12px;
+    padding: 12px;
     overflow: auto;
     background: #f9f9f9;
 }
@@ -234,7 +234,54 @@ section > .row > label .small {
 }
 
 .side .row {
-    margin-bottom: 32px;
+    margin-bottom: 20px;
+}
+
+.provider-tabs {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 6px;
+    background: #00000010;
+    padding: 6px 0 0 6px;
+}
+
+.provider-tab {
+    position: relative;
+    display: inline-flex;
+}
+
+.provider-tab input {
+    position: absolute;
+    opacity: 0;
+    pointer-events: none;
+}
+
+.provider-tab span {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 38px;
+  padding: 8px;
+  border: 1px solid #d0d0d0;
+  border-radius: 2px 2px 0 0;
+  background: #e8e8e8;
+  color: #555;
+  cursor: pointer;
+  user-select: none;
+  transition: background 0.15s, border-color 0.15s, color 0.15s;
+  font-size: 75%;
+}
+
+.provider-tab input:checked + span {
+    background: #f9f9f9;
+    border-color: #999;
+    color: #111;
+    border-bottom: none;
+}
+
+.provider-tab input:focus-visible + span {
+    outline: 2px solid #666;
+    outline-offset: 2px;
 }
 
 .row button {