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AI 20 June 2026 2 min read

# The AI Stack We Actually Ship in 2026

The production AI stack Nexuri ships in 2026 — LangGraph, GraphRAG, Qdrant, vLLM and MCP — and why we pick each, hosted in the EU.

Most "AI" you see in demos never survives contact with real users. The gap between a slick chatbot and a system that answers correctly, every time, on your data — that gap is the whole job. Here is the stack we actually ship in 2026, and why.

## Orchestration: LangGraph over loose scripts

Agents that matter aren't a single prompt — they're graphs of steps with retries, branches and human checkpoints. We build them with LangGraph (and LangChain for the glue) because explicit state beats clever prompting at 3am when something breaks.

## Retrieval: RAG, and GraphRAG when relationships matter

Plain RAG with a vector database covers most cases. We default to Qdrant or pgvector for retrieval. But when the answer depends on relationships — org structures, dependencies, citations — we reach for GraphRAG, which traverses a knowledge graph instead of hoping a flat similarity search connects the dots.

## Serving: private models with vLLM and Ollama

Not every workload should call a third-party API. For sensitive data we serve open models with vLLM (throughput) or Ollama (simplicity), so prompts and outputs never leave infrastructure we control.

## Tooling: MCP and Pydantic AI

The Model Context Protocol (MCP) is the part of 2026 that will age well — a clean, standard way to give agents tools and context. Paired with Pydantic AI for typed, validated outputs, it turns "the model said something" into "the model returned a structured object we can trust."

## The part most teams skip: where it runs

Every one of these workloads runs on our AWS infrastructure in EU regions, processed under GDPR. Your data — and your customers' data — never leaves Europe. For most of the companies we work with, that single fact decides the project.

> Building something AI-shaped and tired of demos that fall apart? [Book a call with Nexuri](https://nexuri.de/en/contact) .

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