diff --git a/types/dom-chromium-ai/dom-chromium-ai-tests.ts b/types/dom-chromium-ai/dom-chromium-ai-tests.ts
index de971628a92741..a1fb42aa468038 100644
--- a/types/dom-chromium-ai/dom-chromium-ai-tests.ts
+++ b/types/dom-chromium-ai/dom-chromium-ai-tests.ts
@@ -11,6 +11,22 @@ async function topLevel() {
         initialPrompts: [{ role: "assistant", content: "foo", prefix: true }],
     });
 
+    // samplingMode is valid on its own
+    await LanguageModel.create({ samplingMode: "most-creative" });
+    await LanguageModel.create({ samplingMode: "balanced" });
+
+    await LanguageModel.create({
+        samplingMode: "balanced",
+        // @ts-expect-error - samplingMode and topK/temperature are mutually exclusive.
+        topK: 1,
+    });
+
+    await LanguageModel.create({
+        samplingMode: "balanced",
+        // @ts-expect-error - samplingMode and topK/temperature are mutually exclusive.
+        temperature: 0.5,
+    });
+
     const languageModel = await LanguageModel.create({
         topK: 1,
         temperature: 0,
diff --git a/types/dom-chromium-ai/index.d.ts b/types/dom-chromium-ai/index.d.ts
index 511cfe22f4318c..19587aba73f5ba 100644
--- a/types/dom-chromium-ai/index.d.ts
+++ b/types/dom-chromium-ai/index.d.ts
@@ -116,25 +116,42 @@ interface LanguageModelParams {
     readonly maxTemperature: number;
 }
 
-interface LanguageModelCreateCoreOptions {
-    /** @deprecated Restricted to web extension contexts only. Use the topK option within LanguageModel.create() is now restricted to web extensions. */
-    topK?: number;
-    /** @deprecated Restricted to web extension contexts only. Use the temperature option within LanguageModel.create() is now restricted to web extensions. */
-    temperature?: number;
-
+type LanguageModelSamplingMode =
+    | "most-predictable"
+    | "predictable"
+    | "balanced"
+    | "creative"
+    | "most-creative";
+
+/**
+ * samplingMode and the raw sampling params (topK, temperature) are mutually exclusive.
+ * Providing both results in a TypeError at runtime.
+ * Note: topK and temperature are only available in Chrome extension contexts (Chrome 151+).
+ */
+type LanguageModelSamplingOptions =
+    | { samplingMode?: LanguageModelSamplingMode; topK?: never; temperature?: never }
+    | {
+        samplingMode?: never;
+        /** @deprecated Restricted to web extension contexts only. */
+        topK?: number;
+        /** @deprecated Restricted to web extension contexts only. */
+        temperature?: number;
+    };
+
+type LanguageModelCreateCoreOptions = {
     expectedInputs?: LanguageModelExpected[];
     expectedOutputs?: LanguageModelExpected[];
     tools?: LanguageModelTool[];
-}
+} & LanguageModelSamplingOptions;
 
-interface LanguageModelCreateOptions extends LanguageModelCreateCoreOptions {
+type LanguageModelCreateOptions = LanguageModelCreateCoreOptions & {
     signal?: AbortSignal;
     monitor?: CreateMonitorCallback;
 
     initialPrompts?:
         | [LanguageModelSystemMessage, ...LanguageModelMessage[]]
         | LanguageModelMessage[];
-}
+};
 
 interface LanguageModelPromptOptions {
     responseConstraint?: Record<string, unknown>;
diff --git a/types/dom-speech-recognition/index.d.ts b/types/dom-speech-recognition/index.d.ts
index bb7266c40d7dc8..617761cf1e65e9 100644
--- a/types/dom-speech-recognition/index.d.ts
+++ b/types/dom-speech-recognition/index.d.ts
@@ -1,4 +1,4 @@
-// https://developer.mozilla.org/en-US/docs/Web/API/SpeechRecognition#events
+// https://webaudio.github.io/web-speech-api/#speechreco-section
 interface SpeechRecognitionEventMap {
     audioend: Event;
     audiostart: Event;
@@ -13,7 +13,7 @@ interface SpeechRecognitionEventMap {
     start: Event;
 }
 
-// https://wicg.github.io/speech-api/#speechreco-section
+// https://webaudio.github.io/web-speech-api/#speechreco-section
 interface SpeechRecognition extends EventTarget {
     continuous: boolean;
     grammars: SpeechGrammarList;
@@ -57,7 +57,7 @@ interface SpeechRecognition extends EventTarget {
     ): void;
 }
 
-// https://wicg.github.io/speech-api/#dictdef-speechrecognitionoptions
+// https://webaudio.github.io/web-speech-api/#dictdef-speechrecognitionoptions
 interface SpeechRecognitionOptions {
     langs: string[];
     processLocally: boolean;
@@ -77,13 +77,13 @@ declare var SpeechRecognition: {
     install(options: SpeechRecognitionOptions): Promise<boolean>;
 };
 
-// https://wicg.github.io/speech-api/#speechrecognitionevent
+// https://webaudio.github.io/web-speech-api/#speechrecognitionevent
 interface SpeechRecognitionEventInit extends EventInit {
     resultIndex?: number;
     results: SpeechRecognitionResultList;
 }
 
-// https://wicg.github.io/speech-api/#dictdef-speechrecognitioneventinit
+// https://webaudio.github.io/web-speech-api/#dictdef-speechrecognitioneventinit
 interface SpeechRecognitionEvent extends Event {
     readonly resultIndex: number;
     readonly results: SpeechRecognitionResultList;
@@ -94,7 +94,7 @@ declare var SpeechRecognitionEvent: {
     new(type: string, eventInitDict: SpeechRecognitionEventInit): SpeechRecognitionEvent;
 };
 
-// https://wicg.github.io/speech-api/#enumdef-speechrecognitionerrorcode
+// https://webaudio.github.io/web-speech-api/#enumdef-speechrecognitionerrorcode
 // type SpeechRecognitionErrorCode =
 //     | "aborted"
 //     | "audio-capture"
@@ -105,13 +105,13 @@ declare var SpeechRecognitionEvent: {
 //     | "not-allowed"
 //     | "service-not-allowed";
 
-// https://wicg.github.io/speech-api/#dictdef-speechrecognitionerroreventinit
+// https://webaudio.github.io/web-speech-api/#dictdef-speechrecognitionerroreventinit
 interface SpeechRecognitionErrorEventInit extends EventInit {
     error: SpeechRecognitionErrorCode;
     message?: string;
 }
 
-// https://wicg.github.io/speech-api/#speechrecognitionerrorevent
+// https://webaudio.github.io/web-speech-api/#speechrecognitionerrorevent
 interface SpeechRecognitionErrorEvent extends Event {
     readonly error: SpeechRecognitionErrorCode;
     readonly message: string;
@@ -122,7 +122,7 @@ declare var SpeechRecognitionErrorEvent: {
     new(type: string, eventInitDict: SpeechRecognitionErrorEventInit): SpeechRecognitionErrorEvent;
 };
 
-// https://wicg.github.io/speech-api/#speechgrammar
+// https://webaudio.github.io/web-speech-api/#speechgrammar
 interface SpeechGrammar {
     src: string;
     weight: number;
@@ -133,7 +133,7 @@ declare var SpeechGrammar: {
     new(): SpeechGrammar;
 };
 
-// https://wicg.github.io/speech-api/#speechgrammarlist
+// https://webaudio.github.io/web-speech-api/#speechgrammarlist
 interface SpeechGrammarList {
     readonly length: number;
     addFromString(string: string, weight?: number): void;
diff --git a/types/dom-speech-recognition/ts5.9/index.d.ts b/types/dom-speech-recognition/ts5.9/index.d.ts
index 133e6c30aa3984..4aa66b16381b53 100644
--- a/types/dom-speech-recognition/ts5.9/index.d.ts
+++ b/types/dom-speech-recognition/ts5.9/index.d.ts
@@ -1,4 +1,4 @@
-// https://developer.mozilla.org/en-US/docs/Web/API/SpeechRecognition#events
+// https://webaudio.github.io/web-speech-api/#speechreco-section
 interface SpeechRecognitionEventMap {
     audioend: Event;
     audiostart: Event;
@@ -13,7 +13,7 @@ interface SpeechRecognitionEventMap {
     start: Event;
 }
 
-// https://wicg.github.io/speech-api/#speechreco-section
+// https://webaudio.github.io/web-speech-api/#speechreco-section
 interface SpeechRecognition extends EventTarget {
     continuous: boolean;
     grammars: SpeechGrammarList;
@@ -57,7 +57,7 @@ interface SpeechRecognition extends EventTarget {
     ): void;
 }
 
-// https://wicg.github.io/speech-api/#dictdef-speechrecognitionoptions
+// https://webaudio.github.io/web-speech-api/#dictdef-speechrecognitionoptions
 interface SpeechRecognitionOptions {
     langs: string[];
     processLocally: boolean;
@@ -77,13 +77,13 @@ declare var SpeechRecognition: {
     install(options: SpeechRecognitionOptions): Promise<boolean>;
 };
 
-// https://wicg.github.io/speech-api/#speechrecognitionevent
+// https://webaudio.github.io/web-speech-api/#speechrecognitionevent
 interface SpeechRecognitionEventInit extends EventInit {
     resultIndex?: number;
     results: SpeechRecognitionResultList;
 }
 
-// https://wicg.github.io/speech-api/#dictdef-speechrecognitioneventinit
+// https://webaudio.github.io/web-speech-api/#dictdef-speechrecognitioneventinit
 interface SpeechRecognitionEvent extends Event {
     readonly resultIndex: number;
     readonly results: SpeechRecognitionResultList;
@@ -94,7 +94,7 @@ declare var SpeechRecognitionEvent: {
     new(type: string, eventInitDict: SpeechRecognitionEventInit): SpeechRecognitionEvent;
 };
 
-// https://wicg.github.io/speech-api/#enumdef-speechrecognitionerrorcode
+// https://webaudio.github.io/web-speech-api/#enumdef-speechrecognitionerrorcode
 type SpeechRecognitionErrorCode =
     | "aborted"
     | "audio-capture"
@@ -105,13 +105,13 @@ type SpeechRecognitionErrorCode =
     | "not-allowed"
     | "service-not-allowed";
 
-// https://wicg.github.io/speech-api/#dictdef-speechrecognitionerroreventinit
+// https://webaudio.github.io/web-speech-api/#dictdef-speechrecognitionerroreventinit
 interface SpeechRecognitionErrorEventInit extends EventInit {
     error: SpeechRecognitionErrorCode;
     message?: string;
 }
 
-// https://wicg.github.io/speech-api/#speechrecognitionerrorevent
+// https://webaudio.github.io/web-speech-api/#speechrecognitionerrorevent
 interface SpeechRecognitionErrorEvent extends Event {
     readonly error: SpeechRecognitionErrorCode;
     readonly message: string;
@@ -122,7 +122,7 @@ declare var SpeechRecognitionErrorEvent: {
     new(type: string, eventInitDict: SpeechRecognitionErrorEventInit): SpeechRecognitionErrorEvent;
 };
 
-// https://wicg.github.io/speech-api/#speechgrammar
+// https://webaudio.github.io/web-speech-api/#speechgrammar
 interface SpeechGrammar {
     src: string;
     weight: number;
@@ -133,7 +133,7 @@ declare var SpeechGrammar: {
     new(): SpeechGrammar;
 };
 
-// https://wicg.github.io/speech-api/#speechgrammarlist
+// https://webaudio.github.io/web-speech-api/#speechgrammarlist
 interface SpeechGrammarList {
     readonly length: number;
     addFromString(string: string, weight?: number): void;