Remove all traces of params(), topK, and temperature

ai-session-management/script.js

@@ -15,11 +15,6 @@ const promptInput = document.querySelector('.prompt-input');
 
 const assistants = {};
 
-const DEFAULT_PARMS = {
-  defaultTopK: 3,
-  defaultTemperature: 1.0,
-};
-
 let controller = null;
 
 stopButton.addEventListener('click', () => {
@@ -45,13 +40,6 @@ async function createLanguageModel(options) {
 }
 
 (async function init() {
-  // Get the default parameters.
-  // The new API shape, currently behind a flag in Canary has a `params()` method that returs
-  // the default and maximing topK and temperature. A hardcoded value, DEFAULT_PARAMS is used
-  // for the previous API shape.
-  const { defaultTopK: topK, defaultTemperature: temperature } = "LanguageModel" in self ?
-    await LanguageModel.params() : DEFAULT_PARMS;
-
   const uuids = getUUIDs();
 
   if (uuids.length) {
@@ -76,8 +64,6 @@ async function createLanguageModel(options) {
 
     const options = storedOptions || {
       initialPrompts: [],
-      topK,
-      temperature,
       conversationSummary: 'New conversation',
     };
 

firebase-ai-logic/src/main.js

@@ -26,13 +26,6 @@ const ai = getAI(firebaseApp, { backend: new GoogleAIBackend() });
 const model = getGenerativeModel(ai, {
   mode: 'prefer_on_device',
   model: 'gemini-2.5-flash',
-  // Temporarily removing until b/428712667 gets fixed.
-  /*
-  onDeviceParams: {
-    temperature: 0.8,
-    topK: 10,
-  },
-  */
 });
 
 const [pre1, pre2] = Array.from(document.querySelectorAll('pre'));

mediarecorder-audio-prompt/script.js

@@ -51,12 +51,9 @@ inputFile.oninput = async (event) => {
 
 async function transcribe(blob) {
   const arrayBuffer = await blob.arrayBuffer();
-
-  const params = await LanguageModel.params();
+
   const session = await LanguageModel.create({
     expectedInputs: [{ type: "audio" }],
-    temperature: 0.1,
-    topK: params.defaultTopK,
   });
 
   const stream = session.promptStreaming([

prompt-api-playground/index.html

@@ -39,37 +39,18 @@ <h1>✨ Prompt API Playground</h1>
         <button type="submit" id="submit-button">Submit prompt</button>
         <button type="button" id="reset-button">Reset session</button>
         <span id="cost"></span>
-        <div class="settings">
-          <label for="session-top-k">Top-k</label>
-          <input
-            id="session-top-k"
-            min="1"
-            type="number"
-          >
-          <label for="session-temperature">Temperature</label>
-          <input
-            id="session-temperature"
-            type="number"
-            step="0.1"
-            min="0"
-          >
-        </div>
       </form>
       <h2>Session stats</h2>
       <table>
         <thead>
           <tr>
-            <th>Temperature</th>
-            <th>Top-k</th>
             <th>Tokens so far</th>
             <th>Tokens left</th>
             <th>Total tokens</th>
           </tr>
         </thead>
         <tbody>
           <tr>
-            <td id="temperature">&nbsp;</td>
-            <td id="top-k">&nbsp;</td>
             <td id="tokens-so-far">&nbsp;</td>
             <td id="tokens-left">&nbsp;</td>
             <td id="max-tokens">&nbsp;</td>

prompt-api-playground/script.js

@@ -22,12 +22,8 @@ const SYSTEM_PROMPT = "You are a helpful and friendly assistant.";
   const rawResponse = document.querySelector("details div");
   const form = document.querySelector("form");
   const maxTokensInfo = document.getElementById("max-tokens");
-  const temperatureInfo = document.getElementById("temperature");
   const tokensLeftInfo = document.getElementById("tokens-left");
   const tokensSoFarInfo = document.getElementById("tokens-so-far");
-  const topKInfo = document.getElementById("top-k");
-  const sessionTemperature = document.getElementById("session-temperature");
-  const sessionTopK = document.getElementById("session-top-k");
 
   responseArea.style.display = "none";
 
@@ -101,9 +97,6 @@ const SYSTEM_PROMPT = "You are a helpful and friendly assistant.";
       { minimumFractionDigits: 1, maximumFractionDigits: 1 },
     );
 
-    temperatureInfo.textContent = decimalNumberFormat.format(session.temperature);
-    topKInfo.textContent = numberFormat.format(session.topK);
-
     // In the new API shape, currently in Chrome Canary, `session.maxTokens` was renamed to
     // `session.inputQuota` and `session.tokensSoFar` was renamed to `session.inputUsage`.
     // `session.tokensSoFar` was removed, but the value can be calculated by subtracting
@@ -169,10 +162,8 @@ const SYSTEM_PROMPT = "You are a helpful and friendly assistant.";
     copyLinkButton.style.display = "none";
     copyHelper.style.display = "none";
     maxTokensInfo.textContent = "";
-    temperatureInfo.textContent = "";
     tokensLeftInfo.textContent = "";
     tokensSoFarInfo.textContent = "";
-    topKInfo.textContent = "";
     promptInput.focus();
   };
 
@@ -208,8 +199,6 @@ const SYSTEM_PROMPT = "You are a helpful and friendly assistant.";
   const updateSession = async () => {
     if (self.LanguageModel) {
       session = await LanguageModel.create({
-        temperature: Number(sessionTemperature.value),
-        topK: Number(sessionTopK.value),
         initialPrompts: [
           {
             role: 'system',
@@ -222,22 +211,7 @@ const SYSTEM_PROMPT = "You are a helpful and friendly assistant.";
     updateStats();
   };
 
-  sessionTemperature.addEventListener("input", async () => {
-    await updateSession();
-  });
-
-  sessionTopK.addEventListener("input", async () => {
-    await updateSession();
-  });
-
   if (!session) {
-    let { defaultTopK, maxTopK, defaultTemperature, maxTemperature } = "LanguageModel" in self ?
-      await LanguageModel.params() : {defaultTopK: 3, maxTopK: 128, defaultTemperature: 1, maxTemperature: 2};
-    defaultTopK ||= 3;  // https://crbug.com/441711146
-    sessionTemperature.value = defaultTemperature;
-    sessionTemperature.max = maxTemperature;
-    sessionTopK.value = defaultTopK;
-    sessionTopK.max = maxTopK;
     await updateSession();
   }
 })();