diff --git a/src/core/task-persistence/providerState.ts b/src/core/task-persistence/providerState.ts
deleted file mode 100644
index 7119568c52..0000000000
--- a/src/core/task-persistence/providerState.ts
+++ /dev/null
@@ -1,76 +0,0 @@
-import * as path from "path"
-import * as fs from "fs/promises"
-
-import { safeWriteJson } from "../../utils/safeWriteJson"
-import { fileExistsAtPath } from "../../utils/fs"
-import { getTaskDirectoryPath } from "../../utils/storage"
-import { GlobalFileNames } from "../../shared/globalFileNames"
-
-/**
- * Persistent state for OpenAI Native (Responses API) provider.
- * Stores encrypted reasoning content (via conversationHistory) and lineage (lastResponseId)
- * so stateless flows can be resumed across pauses, crashes, and task switches.
- */
-export type OpenAiNativePersistentState = {
-	lastResponseId?: string
-	conversationHistory: any[]
-	/**
-	 * Pairing of assistant turn -> its encrypted reasoning artifact, for precise stateless restoration.
-	 * Each item is a Responses API input item containing the encrypted artifact for that responseId.
-	 */
-	encryptedArtifacts?: Array<{ responseId: string; item: any }>
-}
-
-export type ReadOpenAiNativeStateOptions = {
-	taskId: string
-	globalStoragePath: string
-}
-
-export type SaveOpenAiNativeStateOptions = ReadOpenAiNativeStateOptions & {
-	state: OpenAiNativePersistentState
-}
-
-/**
- * Read provider state persisted for a specific task.
- * Returns undefined if no state exists yet.
- */
-export async function readOpenAiNativeState({
-	taskId,
-	globalStoragePath,
-}: ReadOpenAiNativeStateOptions): Promise<OpenAiNativePersistentState | undefined> {
-	const taskDir = await getTaskDirectoryPath(globalStoragePath, taskId)
-	const filePath = path.join(taskDir, GlobalFileNames.openAiNativeState)
-
-	try {
-		if (await fileExistsAtPath(filePath)) {
-			const raw = await fs.readFile(filePath, "utf8")
-			const parsed = JSON.parse(raw)
-			// Basic shape sanity
-			if (parsed && typeof parsed === "object" && Array.isArray(parsed.conversationHistory || [])) {
-				return parsed as OpenAiNativePersistentState
-			}
-		}
-	} catch (error) {
-		console.error(`[OpenAiNativeState] Failed to read state for task ${taskId}:`, error)
-	}
-
-	return undefined
-}
-
-/**
- * Persist provider state to the task directory (atomic via safeWriteJson).
- */
-export async function saveOpenAiNativeState({
-	taskId,
-	globalStoragePath,
-	state,
-}: SaveOpenAiNativeStateOptions): Promise<void> {
-	const taskDir = await getTaskDirectoryPath(globalStoragePath, taskId)
-	const filePath = path.join(taskDir, GlobalFileNames.openAiNativeState)
-
-	try {
-		await safeWriteJson(filePath, state)
-	} catch (error) {
-		console.error(`[OpenAiNativeState] Failed to write state for task ${taskId}:`, error)
-	}
-}
diff --git a/src/shared/globalFileNames.ts b/src/shared/globalFileNames.ts
index 1145d8a102..98b48485f0 100644
--- a/src/shared/globalFileNames.ts
+++ b/src/shared/globalFileNames.ts
@@ -4,5 +4,4 @@ export const GlobalFileNames = {
 	mcpSettings: "mcp_settings.json",
 	customModes: "custom_modes.yaml",
 	taskMetadata: "task_metadata.json",
-	openAiNativeState: "openai_native_state.json",
 }