diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 51cd60763..eb5ddb6a1 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "5.8.1"
+  ".": "5.8.2"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0d29dbd4..607f0f2ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 5.8.2 (2025-06-27)
+
+Full Changelog: [v5.8.1...v5.8.2](https://github.com/openai/openai-node/compare/v5.8.1...v5.8.2)
+
+### Bug Fixes
+
+* **client:** get fetchOptions type more reliably ([b3c959d](https://github.com/openai/openai-node/commit/b3c959d22d1002a85772385476f9a5098c8e1514))
+
 ## 5.8.1 (2025-06-26)
 
 Full Changelog: [v5.8.0...v5.8.1](https://github.com/openai/openai-node/compare/v5.8.0...v5.8.1)
diff --git a/jsr.json b/jsr.json
index f8f173ded..16be8305e 100644
--- a/jsr.json
+++ b/jsr.json
@@ -1,6 +1,6 @@
 {
   "name": "@openai/openai",
-  "version": "5.8.1",
+  "version": "5.8.2",
   "exports": {
     ".": "./index.ts",
     "./helpers/zod": "./helpers/zod.ts",
diff --git a/package.json b/package.json
index 7c2710c2b..232dce668 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "openai",
-  "version": "5.8.1",
+  "version": "5.8.2",
   "description": "The official TypeScript library for the OpenAI API",
   "author": "OpenAI <support@openai.com>",
   "types": "dist/index.d.ts",
diff --git a/src/internal/types.ts b/src/internal/types.ts
index d7928cd35..b668dfc0f 100644
--- a/src/internal/types.ts
+++ b/src/internal/types.ts
@@ -7,7 +7,7 @@ export type KeysEnum<T> = { [P in keyof Required<T>]: true };
 
 export type FinalizedRequestInit = RequestInit & { headers: Headers };
 
-type NotAny<T> = [unknown] extends [T] ? never : T;
+type NotAny<T> = [0] extends [1 & T] ? never : T;
 
 /**
  * Some environments overload the global fetch function, and Parameters<T> only gets the last signature.
@@ -64,13 +64,15 @@ type OverloadedParameters<T> =
  * [1]: https://www.typescriptlang.org/tsconfig/#typeAcquisition
  */
 /** @ts-ignore For users with \@types/node */
-type UndiciTypesRequestInit = NotAny<import('../node_modules/undici-types').RequestInit> | NotAny<import('../../node_modules/undici-types').RequestInit> | NotAny<import('../../../node_modules/undici-types').RequestInit> | NotAny<import('../../../../node_modules/undici-types').RequestInit> | NotAny<import('../../../../../node_modules/undici-types').RequestInit> | NotAny<import('../../../../../../node_modules/undici-types').RequestInit> | NotAny<import('../../../../../../../node_modules/undici-types').RequestInit> | NotAny<import('../../../../../../../../node_modules/undici-types').RequestInit> | NotAny<import('../../../../../../../../../node_modules/undici-types').RequestInit> | NotAny<import('../../../../../../../../../../node_modules/undici-types').RequestInit>;
+type UndiciTypesRequestInit = NotAny<import('../node_modules/undici-types/index.d.ts').RequestInit> | NotAny<import('../../node_modules/undici-types/index.d.ts').RequestInit> | NotAny<import('../../../node_modules/undici-types/index.d.ts').RequestInit> | NotAny<import('../../../../node_modules/undici-types/index.d.ts').RequestInit> | NotAny<import('../../../../../node_modules/undici-types/index.d.ts').RequestInit> | NotAny<import('../../../../../../node_modules/undici-types/index.d.ts').RequestInit> | NotAny<import('../../../../../../../node_modules/undici-types/index.d.ts').RequestInit> | NotAny<import('../../../../../../../../node_modules/undici-types/index.d.ts').RequestInit> | NotAny<import('../../../../../../../../../node_modules/undici-types/index.d.ts').RequestInit> | NotAny<import('../../../../../../../../../../node_modules/undici-types/index.d.ts').RequestInit>;
 /** @ts-ignore For users with undici */
-type UndiciRequestInit = NotAny<import('../node_modules/undici').RequestInit> | NotAny<import('../../node_modules/undici').RequestInit> | NotAny<import('../../../node_modules/undici').RequestInit> | NotAny<import('../../../../node_modules/undici').RequestInit> | NotAny<import('../../../../../node_modules/undici').RequestInit> | NotAny<import('../../../../../../node_modules/undici').RequestInit> | NotAny<import('../../../../../../../node_modules/undici').RequestInit> | NotAny<import('../../../../../../../../node_modules/undici').RequestInit> | NotAny<import('../../../../../../../../../node_modules/undici').RequestInit> | NotAny<import('../../../../../../../../../../node_modules/undici').RequestInit>;
+type UndiciRequestInit = NotAny<import('../node_modules/undici/index.d.ts').RequestInit> | NotAny<import('../../node_modules/undici/index.d.ts').RequestInit> | NotAny<import('../../../node_modules/undici/index.d.ts').RequestInit> | NotAny<import('../../../../node_modules/undici/index.d.ts').RequestInit> | NotAny<import('../../../../../node_modules/undici/index.d.ts').RequestInit> | NotAny<import('../../../../../../node_modules/undici/index.d.ts').RequestInit> | NotAny<import('../../../../../../../node_modules/undici/index.d.ts').RequestInit> | NotAny<import('../../../../../../../../node_modules/undici/index.d.ts').RequestInit> | NotAny<import('../../../../../../../../../node_modules/undici/index.d.ts').RequestInit> | NotAny<import('../../../../../../../../../../node_modules/undici/index.d.ts').RequestInit>;
 /** @ts-ignore For users with \@types/bun */
 type BunRequestInit = globalThis.FetchRequestInit;
-/** @ts-ignore For users with node-fetch */
-type NodeFetchRequestInit = NotAny<import('../node_modules/node-fetch').RequestInit> | NotAny<import('../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../../../../../node_modules/node-fetch').RequestInit>;
+/** @ts-ignore For users with node-fetch@2 */
+type NodeFetch2RequestInit = NotAny<import('../node_modules/@types/node-fetch/index.d.ts').RequestInit> | NotAny<import('../../node_modules/@types/node-fetch/index.d.ts').RequestInit> | NotAny<import('../../../node_modules/@types/node-fetch/index.d.ts').RequestInit> | NotAny<import('../../../../node_modules/@types/node-fetch/index.d.ts').RequestInit> | NotAny<import('../../../../../node_modules/@types/node-fetch/index.d.ts').RequestInit> | NotAny<import('../../../../../../node_modules/@types/node-fetch/index.d.ts').RequestInit> | NotAny<import('../../../../../../../node_modules/@types/node-fetch/index.d.ts').RequestInit> | NotAny<import('../../../../../../../../node_modules/@types/node-fetch/index.d.ts').RequestInit> | NotAny<import('../../../../../../../../../node_modules/@types/node-fetch/index.d.ts').RequestInit> | NotAny<import('../../../../../../../../../../node_modules/@types/node-fetch/index.d.ts').RequestInit>;
+/** @ts-ignore For users with node-fetch@3, doesn't need file extension because types are at ./@types/index.d.ts */
+type NodeFetch3RequestInit =  NotAny<import('../node_modules/node-fetch').RequestInit> | NotAny<import('../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../../../../node_modules/node-fetch').RequestInit> | NotAny<import('../../../../../../../../../../node_modules/node-fetch').RequestInit>;
 /** @ts-ignore For users who use Deno */
 type FetchRequestInit = NonNullable<OverloadedParameters<typeof fetch>[1]>;
 /* eslint-enable */
@@ -79,7 +81,8 @@ type RequestInits =
   | NotAny<UndiciTypesRequestInit>
   | NotAny<UndiciRequestInit>
   | NotAny<BunRequestInit>
-  | NotAny<NodeFetchRequestInit>
+  | NotAny<NodeFetch2RequestInit>
+  | NotAny<NodeFetch3RequestInit>
   | NotAny<RequestInit>
   | NotAny<FetchRequestInit>;
 
diff --git a/src/version.ts b/src/version.ts
index efcc698ed..4aa7a1fa2 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '5.8.1'; // x-release-please-version
+export const VERSION = '5.8.2'; // x-release-please-version