diff --git a/sentry-javascript/18962/.gitignore b/sentry-javascript/18962/.gitignore
new file mode 100644
index 0000000..e44b27c
--- /dev/null
+++ b/sentry-javascript/18962/.gitignore
@@ -0,0 +1,4 @@
+node_modules/
+dist/
+package-lock.json
+.env
diff --git a/sentry-javascript/18962/README.md b/sentry-javascript/18962/README.md
new file mode 100644
index 0000000..89bd227
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+++ b/sentry-javascript/18962/README.md
@@ -0,0 +1,102 @@
+# Reproduction for sentry-javascript#18962
+
+**Issue:** https://github.com/getsentry/sentry-javascript/issues/18962
+
+## Description
+
+This reproduction attempts to demonstrate the reported issue where OpenAI streaming breaks when Sentry is initialized in a NestJS application with `@sentry/nestjs`.
+
+**Note:** In our testing, streaming works correctly both with and without Sentry enabled. We need more details from the issue reporter to reproduce the exact issue.
+
+## Setup
+
+This is a NestJS application that uses:
+- `@sentry/nestjs` v10.x (with OpenAI and LangChain integrations)
+- `@langchain/openai` for LangChain integration
+
+## Steps to Reproduce
+
+1. Install dependencies:
+   ```bash
+   npm install
+   ```
+
+2. Create a `.env` file with your configuration:
+   ```bash
+   OPENAI_API_KEY=sk-your-key-here
+   SENTRY_DSN=https://your-dsn@sentry.io/project
+   ENABLE_SENTRY=true
+   ```
+
+   Set `ENABLE_SENTRY=true` to enable Sentry, or omit/set to any other value to disable.
+
+3. Build the TypeScript:
+   ```bash
+   npm run build
+   ```
+
+4. Run the server:
+   ```bash
+   npm run start
+   ```
+
+5. Test streaming:
+   ```bash
+   curl http://localhost:3000/stream-langchain
+   curl http://localhost:3000/stream-openai
+   ```
+
+## Available Endpoints
+
+- `GET /` - Status and available endpoints
+- `GET /stream-openai` - Test OpenAI streaming via LangChain's ChatOpenAI
+- `GET /stream-langchain` - Test OpenAI streaming via LangChain
+
+## Expected Behavior (per issue)
+
+According to the issue, with Sentry enabled:
+- Streaming should break
+- Only the final complete response should come through (1-2 chunks)
+- Real-time streaming behavior should not work
+
+## Actual Behavior (our testing)
+
+In our testing with `@sentry/nestjs@10.36.0`:
+- Streaming works correctly with Sentry enabled
+- 40+ chunks received for all streaming methods
+- No difference between Sentry enabled/disabled
+
+## Environment
+
+- Node.js: 22.x
+- @sentry/nestjs: 10.36.0
+- @nestjs/core: 10.x
+- @langchain/openai: 1.x
+
+## Questions for Issue Reporter
+
+To help reproduce the issue, please provide:
+
+1. **Exact SDK version**: What specific version of `@sentry/nestjs` are you using?
+2. **Node.js version**: What Node.js version?
+3. **Sentry.init config**: Full Sentry initialization config
+4. **NestJS setup**: Any interceptors, middleware, or guards that might affect responses?
+5. **OpenAI usage**: Exact code showing how you're using OpenAI/LangChain
+6. **Network config**: Any proxies or custom HTTP agents?
+
+## Workaround (from issue)
+
+The issue reporter found that `defaultIntegrations: false` helps, suggesting one of the default integrations causes the problem. Try narrowing down which integration:
+
+```typescript
+Sentry.init({
+  dsn: '...',
+  // Try disabling specific integrations to find the culprit
+  integrations: (integrations) => {
+    return integrations.filter((integration) => {
+      // Try filtering different integrations
+      return integration.name !== 'OpenAI';
+    });
+  },
+});
+```
diff --git a/sentry-javascript/18962/nest-cli.json b/sentry-javascript/18962/nest-cli.json
new file mode 100644
index 0000000..2566481
--- /dev/null
+++ b/sentry-javascript/18962/nest-cli.json
@@ -0,0 +1,5 @@
+{
+  "$schema": "https://json.schemastore.org/nest-cli",
+  "collection": "@nestjs/schematics",
+  "sourceRoot": "src"
+}
diff --git a/sentry-javascript/18962/package.json b/sentry-javascript/18962/package.json
new file mode 100644
index 0000000..04a452f
--- /dev/null
+++ b/sentry-javascript/18962/package.json
@@ -0,0 +1,26 @@
+{
+  "name": "sentry-nestjs-openai-streaming-repro",
+  "version": "1.0.0",
+  "description": "Reproduction for sentry-javascript#18962 - Sentry breaking OpenAI streaming in NestJS",
+  "main": "dist/main.js",
+  "scripts": {
+    "build": "nest build",
+    "start": "nest start",
+    "start:dev": "nest start --watch"
+  },
+  "dependencies": {
+    "@langchain/openai": "^1.2.3",
+    "@nestjs/common": "^10.0.0",
+    "@nestjs/core": "^10.0.0",
+    "@nestjs/platform-express": "^10.0.0",
+    "@sentry/nestjs": "^10.0.0",
+    "langchain": "^1.2.14",
+    "reflect-metadata": "^0.2.0",
+    "rxjs": "^7.8.1"
+  },
+  "devDependencies": {
+    "@nestjs/cli": "^10.0.0",
+    "@types/node": "^22.0.0",
+    "typescript": "^5.0.0"
+  }
+}
diff --git a/sentry-javascript/18962/src/app.module.ts b/sentry-javascript/18962/src/app.module.ts
new file mode 100644
index 0000000..a394fdc
--- /dev/null
+++ b/sentry-javascript/18962/src/app.module.ts
@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { StreamController } from './stream.controller';
+
+@Module({
+  imports: [],
+  controllers: [StreamController],
+  providers: [],
+})
+export class AppModule {}
diff --git a/sentry-javascript/18962/src/instrument.ts b/sentry-javascript/18962/src/instrument.ts
new file mode 100644
index 0000000..28864fb
--- /dev/null
+++ b/sentry-javascript/18962/src/instrument.ts
@@ -0,0 +1,19 @@
+// Sentry instrumentation file for NestJS
+// This is loaded BEFORE the application starts via --import flag
+import * as Sentry from "@sentry/nestjs";
+
+if (process.env.ENABLE_SENTRY === "true") {
+  console.log("🔍 Initializing Sentry with @sentry/nestjs...");
+
+  Sentry.init({
+    dsn: process.env.SENTRY_DSN || "",
+    environment: "local",
+    tracesSampleRate: 1.0,
+    debug: true,
+    sendDefaultPii: true,
+  });
+
+  console.log("✅ Sentry initialized");
+} else {
+  console.log("⏭️  Sentry disabled (ENABLE_SENTRY != true)");
+}
diff --git a/sentry-javascript/18962/src/main.ts b/sentry-javascript/18962/src/main.ts
new file mode 100644
index 0000000..3001baf
--- /dev/null
+++ b/sentry-javascript/18962/src/main.ts
@@ -0,0 +1,15 @@
+// Import this first!
+import "./instrument";
+
+import { NestFactory } from "@nestjs/core";
+import { AppModule } from "./app.module";
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+  const port = process.env.PORT || 3000;
+  await app.listen(port);
+  console.log(`\n🚀 NestJS server running at http://localhost:${port}`);
+  console.log(`\n📝 Test streaming: curl http://localhost:${port}/stream`);
+  console.log(`   Or open in browser: http://localhost:${port}/stream\n`);
+}
+bootstrap();
diff --git a/sentry-javascript/18962/src/stream.controller.ts b/sentry-javascript/18962/src/stream.controller.ts
new file mode 100644
index 0000000..0be7355
--- /dev/null
+++ b/sentry-javascript/18962/src/stream.controller.ts
@@ -0,0 +1,146 @@
+import { Controller, Get, Res } from "@nestjs/common";
+import { Response } from "express";
+import { ChatOpenAI } from "@langchain/openai";
+import { HumanMessage } from "@langchain/core/messages";
+
+@Controller()
+export class StreamController {
+  private langchainModel: ChatOpenAI | null = null;
+
+  private getLangchainModel(): ChatOpenAI {
+    if (!this.langchainModel) {
+      if (!process.env.OPENAI_API_KEY) {
+        throw new Error(
+          "OPENAI_API_KEY not set. Export it with: export OPENAI_API_KEY=sk-..."
+        );
+      }
+      this.langchainModel = new ChatOpenAI({
+        model: "gpt-4o-mini",
+        temperature: 0,
+        streaming: true,
+      });
+    }
+    return this.langchainModel;
+  }
+
+  @Get("/")
+  index() {
+    return {
+      message: "Sentry NestJS OpenAI Streaming Reproduction",
+      issue: "https://github.com/getsentry/sentry-javascript/issues/18962",
+      endpoints: {
+        "/stream-openai": "Test OpenAI streaming with for-await (GET)",
+        "/stream-langchain": "Test OpenAI streaming via Langchain (GET)",
+      },
+      sentryEnabled: process.env.ENABLE_SENTRY === "true",
+      openaiKeySet: !!process.env.OPENAI_API_KEY,
+    };
+  }
+
+  @Get("/stream-openai")
+  async stream(@Res() res: Response) {
+    try {
+      const openai = new ChatOpenAI({
+        model: "gpt-4o-mini",
+        temperature: 0,
+        maxTokens: undefined,
+        timeout: undefined,
+        maxRetries: 2,
+      });
+
+      res.setHeader("Content-Type", "text/plain; charset=utf-8");
+      res.setHeader("Transfer-Encoding", "chunked");
+
+      console.log("\n📝 [OpenAI for-await] Starting streaming request...");
+      const startTime = Date.now();
+      let chunkCount = 0;
+
+      const stream = await openai.stream(
+        "Count from 1 to 20, each number on a new line. Be slow and deliberate."
+      );
+
+      for await (const chunk of stream) {
+        chunkCount++;
+        const content = chunk.content.toString() || "";
+        if (content) {
+          console.log(
+            `  Chunk ${chunkCount}: "${content.replace(/\n/g, "\\n")}"`
+          );
+          res.write(content);
+        }
+      }
+
+      const elapsed = Date.now() - startTime;
+      console.log(
+        `\n✅ [OpenAI for-await] Completed in ${elapsed}ms, chunks: ${chunkCount}`
+      );
+
+      if (chunkCount < 10) {
+        console.log(
+          "\n⚠️  WARNING: Very few chunks received - streaming may be broken!"
+        );
+      }
+
+      res.end(
+        `\n\n--- Stats ---\nChunks: ${chunkCount}\nTime: ${elapsed}ms\nSentry: ${
+          process.env.ENABLE_SENTRY === "true" ? "ENABLED" : "disabled"
+        }\n`
+      );
+    } catch (error) {
+      console.error("❌ Error:", error.message);
+      res.status(500).json({ error: error.message });
+    }
+  }
+
+  @Get("/stream-langchain")
+  async streamLangchain(@Res() res: Response) {
+    try {
+      const model = this.getLangchainModel();
+
+      res.setHeader("Content-Type", "text/plain; charset=utf-8");
+      res.setHeader("Transfer-Encoding", "chunked");
+
+      console.log("\n📝 [Langchain] Starting streaming request...");
+      const startTime = Date.now();
+      let chunkCount = 0;
+
+      // Using Langchain's streaming with .stream()
+      const stream = await model.stream([
+        new HumanMessage(
+          "Count from 1 to 20, each number on a new line. Be slow and deliberate."
+        ),
+      ]);
+
+      for await (const chunk of stream) {
+        chunkCount++;
+        const content = chunk.content;
+        if (content) {
+          console.log(
+            `  Chunk ${chunkCount}: "${String(content).replace(/\n/g, "\\n")}"`
+          );
+          res.write(String(content));
+        }
+      }
+
+      const elapsed = Date.now() - startTime;
+      console.log(
+        `\n✅ [Langchain] Completed in ${elapsed}ms, chunks: ${chunkCount}`
+      );
+
+      if (chunkCount < 10) {
+        console.log(
+          "\n⚠️  WARNING: Very few chunks received - streaming may be broken!"
+        );
+      }
+
+      res.end(
+        `\n\n--- Stats ---\nChunks: ${chunkCount}\nTime: ${elapsed}ms\nSentry: ${
+          process.env.ENABLE_SENTRY === "true" ? "ENABLED" : "disabled"
+        }\nMethod: Langchain\n`
+      );
+    } catch (error) {
+      console.error("❌ Langchain Error:", error.message);
+      res.status(500).json({ error: error.message });
+    }
+  }
+}
diff --git a/sentry-javascript/18962/tsconfig.json b/sentry-javascript/18962/tsconfig.json
new file mode 100644
index 0000000..95f5641
--- /dev/null
+++ b/sentry-javascript/18962/tsconfig.json
@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "declaration": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "allowSyntheticDefaultImports": true,
+    "target": "ES2021",
+    "sourceMap": true,
+    "outDir": "./dist",
+    "baseUrl": "./",
+    "incremental": true,
+    "skipLibCheck": true,
+    "strictNullChecks": false,
+    "noImplicitAny": false,
+    "strictBindCallApply": false,
+    "forceConsistentCasingInFileNames": false,
+    "noFallthroughCasesInSwitch": false
+  }
+}