June 26, 2026

Trace AI SDK 7 with Langfuse

Hassieb Pakzad

Use @langfuse/vercel-ai-sdk 5.9.0 to trace Vercel AI SDK 7 calls in Langfuse.

AI SDK 7 is generally available, and the Langfuse Vercel AI SDK integration is stable as of @langfuse/vercel-ai-sdk@5.9.0. Register LangfuseVercelAiSdkIntegration once with the AI SDK telemetry registry and keep exporting spans through the Langfuse OpenTelemetry span processor.

The stable setup uses the regular latest npm tags:

npm install ai @ai-sdk/openai @langfuse/client @langfuse/vercel-ai-sdk @langfuse/tracing @langfuse/otel @opentelemetry/sdk-node

instrumentation.ts

import { registerTelemetry } from "ai";
import { LangfuseSpanProcessor } from "@langfuse/otel";
import { LangfuseVercelAiSdkIntegration } from "@langfuse/vercel-ai-sdk";
import { NodeSDK } from "@opentelemetry/sdk-node";

const sdk = new NodeSDK({
  spanProcessors: [new LangfuseSpanProcessor()],
});

sdk.start();

registerTelemetry(new LangfuseVercelAiSdkIntegration());

app.ts

import "./instrumentation";

import { generateText } from "ai";
import { openai } from "@ai-sdk/openai";
import { LangfuseClient } from "@langfuse/client";
import { propagateAttributes } from "@langfuse/tracing";

const langfuseClient = new LangfuseClient();
const langfusePrompt = await langfuseClient.getPrompt("support-chat/default");

await propagateAttributes(
  {
    traceName: "support-chat",
    userId: "user-123",
    sessionId: "session-456",
    tags: ["production", "chat"],
  },
  () =>
    generateText({
      model: openai("gpt-5.1"),
      prompt: langfusePrompt.compile({ topic: "RAG" }),
      runtimeContext: {
        route: "support-chat",
        langfusePrompt,
      },
      telemetry: {
        functionId: "support-chat",
        includeRuntimeContext: {
          route: true,
          langfusePrompt: true,
        },
      },
    }),
);

If you adopted the beta integration, remove the @beta tags from your AI SDK and Langfuse packages. The runtime shape stays the same: AI SDK 7 emits telemetry after registration, while runtimeContext keys must be explicitly included with telemetry.includeRuntimeContext.

Trace AI SDK 7 with Langfuse

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Vercel AI SDK integration

NPM package