diff --git a/web/oss/src/components/AgentChatSlice/assets/constants.test.ts b/web/oss/src/components/AgentChatSlice/assets/constants.test.ts
new file mode 100644
index 0000000000..dcfe05cff4
--- /dev/null
+++ b/web/oss/src/components/AgentChatSlice/assets/constants.test.ts
@@ -0,0 +1,29 @@
+import {afterEach, describe, expect, it, vi} from "vitest"
+
+import {getEnv} from "@/oss/lib/helpers/dynamicEnv"
+
+import {isAgentVoiceInputAvailable} from "./constants"
+
+vi.mock("@/oss/lib/helpers/dynamicEnv", () => ({getEnv: vi.fn(() => "")}))
+
+const mockedGetEnv = vi.mocked(getEnv)
+
+describe("voice input gating", () => {
+    afterEach(() => {
+        mockedGetEnv.mockReset()
+        mockedGetEnv.mockReturnValue("")
+    })
+
+    it("stays off when neither the setting nor the env flag is on", () => {
+        expect(isAgentVoiceInputAvailable(false)).toBe(false)
+    })
+
+    it("turns on from the per-user setting alone", () => {
+        expect(isAgentVoiceInputAvailable(true)).toBe(true)
+    })
+
+    it("turns on from the env flag alone, so dev stacks keep working", () => {
+        mockedGetEnv.mockReturnValue("true")
+        expect(isAgentVoiceInputAvailable(false)).toBe(true)
+    })
+})
diff --git a/web/oss/src/components/AgentChatSlice/assets/constants.ts b/web/oss/src/components/AgentChatSlice/assets/constants.ts
index e240df95ba..fa256c64a7 100644
--- a/web/oss/src/components/AgentChatSlice/assets/constants.ts
+++ b/web/oss/src/components/AgentChatSlice/assets/constants.ts
@@ -32,6 +32,13 @@ export const isAgentChatSteerEnabled = (): boolean =>
 export const isAgentVoiceInputEnabled = (): boolean =>
     (getEnv("NEXT_PUBLIC_AGENT_VOICE_INPUT") || "").toLowerCase() === "true"
 
+/**
+ * Voice input shows when the per-user experimental setting is on, or when the deployment forces it
+ * on with the env flag (so dev stacks that set it keep the UI without touching their settings).
+ */
+export const isAgentVoiceInputAvailable = (settingEnabled: boolean): boolean =>
+    settingEnabled || isAgentVoiceInputEnabled()
+
 /**
  * File uploads and attachments — the composer attach button + attachment preview, and every drive
  * upload entry point (upload button, drop-to-upload in the Files drawer, drop-to-stage on a recents
diff --git a/web/oss/src/components/AgentChatSlice/hooks/useVoiceComposer.ts b/web/oss/src/components/AgentChatSlice/hooks/useVoiceComposer.ts
index 509645fead..5a9690966f 100644
--- a/web/oss/src/components/AgentChatSlice/hooks/useVoiceComposer.ts
+++ b/web/oss/src/components/AgentChatSlice/hooks/useVoiceComposer.ts
@@ -1,8 +1,11 @@
 import {type RefObject, useState} from "react"
 
 import {type RichChatInputHandle} from "@agenta/ui/rich-chat-input"
+import {useAtomValue} from "jotai"
 
-import {isAgentVoiceInputEnabled} from "../assets/constants"
+import {agentVoiceInputEnabledAtom} from "@/oss/state/settings/featureFlags"
+
+import {isAgentVoiceInputAvailable} from "../assets/constants"
 
 import {useAudioRecorder} from "./useAudioRecorder"
 
@@ -36,8 +39,10 @@ export const useVoiceComposer = ({
      * Decided when recording STARTS: the composer is covered by the recording bar and drops are
      * blocked while capturing, so neither the text nor the tray can change in between.
      */
-    // Flagged off until the agent service accepts audio parts (`NEXT_PUBLIC_AGENT_VOICE_INPUT`).
-    const voiceEnabled = isAgentVoiceInputEnabled()
+    // Experimental: off until the person turns it on in Settings, or the deployment forces it on
+    // with `NEXT_PUBLIC_AGENT_VOICE_INPUT`.
+    const voiceSettingEnabled = useAtomValue(agentVoiceInputEnabledAtom)
+    const voiceEnabled = isAgentVoiceInputAvailable(voiceSettingEnabled)
     const [voiceWillSend, setVoiceWillSend] = useState(false)
     const voiceRecorder = useAudioRecorder((file) => {
         if (voiceWillSend) onSendVoiceMessage(file)
diff --git a/web/oss/src/components/pages/settings/FeatureFlags/FeatureFlags.tsx b/web/oss/src/components/pages/settings/FeatureFlags/FeatureFlags.tsx
index c8bac14134..90c3ac6645 100644
--- a/web/oss/src/components/pages/settings/FeatureFlags/FeatureFlags.tsx
+++ b/web/oss/src/components/pages/settings/FeatureFlags/FeatureFlags.tsx
@@ -4,7 +4,10 @@ import {useAtom, useAtomValue, useSetAtom} from "jotai"
 
 import {navSimplifiedOverrideAtom} from "@/oss/lib/onboarding/atoms"
 import {advancedNavHiddenAtom} from "@/oss/state/onboarding/selectors"
-import {playgroundInspectorEnabledAtom} from "@/oss/state/settings/featureFlags"
+import {
+    agentVoiceInputEnabledAtom,
+    playgroundInspectorEnabledAtom,
+} from "@/oss/state/settings/featureFlags"
 
 interface FlagRowProps {
     title: string
@@ -36,6 +39,7 @@ const FeatureFlags = () => {
     const [playgroundInspectorEnabled, setPlaygroundInspectorEnabled] = useAtom(
         playgroundInspectorEnabledAtom,
     )
+    const [agentVoiceInputEnabled, setAgentVoiceInputEnabled] = useAtom(agentVoiceInputEnabledAtom)
 
     return (
         <section className="flex max-w-[640px] flex-col gap-8">
@@ -49,6 +53,12 @@ const FeatureFlags = () => {
                     enabled={!advancedNavHidden}
                     onChange={(enabled) => setNavSimplifiedOverride(!enabled)}
                 />
+                <FlagRow
+                    title="Voice input"
+                    description="Dictate messages in the agent chat."
+                    enabled={agentVoiceInputEnabled}
+                    onChange={setAgentVoiceInputEnabled}
+                />
             </div>
 
             <div className="flex flex-col gap-4">
diff --git a/web/oss/src/state/settings/featureFlags.ts b/web/oss/src/state/settings/featureFlags.ts
index 3408822189..c7d898a02e 100644
--- a/web/oss/src/state/settings/featureFlags.ts
+++ b/web/oss/src/state/settings/featureFlags.ts
@@ -7,6 +7,24 @@ const playgroundInspectorAtomFamily = atomFamily((userId: string) =>
     atomWithStorage<boolean>(`agenta:settings:${userId}:playground-inspector`, false),
 )
 
+const agentVoiceInputAtomFamily = atomFamily((userId: string) =>
+    atomWithStorage<boolean>(`agenta:settings:${userId}:agent-voice-input`, false),
+)
+
+/** Experimental switch for the agent chat composer's dictation + voice-message controls. */
+export const agentVoiceInputEnabledAtom = atom(
+    (get) => {
+        const userId = get(onboardingStorageUserIdAtom)
+        if (!userId) return false
+        return get(agentVoiceInputAtomFamily(userId))
+    },
+    (get, set, next: boolean) => {
+        const userId = get(onboardingStorageUserIdAtom)
+        if (!userId) return
+        set(agentVoiceInputAtomFamily(userId), next)
+    },
+)
+
 export const playgroundInspectorEnabledAtom = atom(
     (get) => {
         const userId = get(onboardingStorageUserIdAtom)