Introduction

Modern engineering teams often face what Meryem Arik calls “inference chaos” – a situation where decentralized teams choose their own AI models without any central oversight, leading to security gaps, cost overruns, and inconsistent governance. The solution is an AI model gateway, a control layer that sits between your applications and the various language models (LLMs) they use. This guide walks you through the steps to implement a centralized inference gateway that balances team autonomy with organizational control, covering open-source options like LiteLLM and Doubleword.

What You Need

• Access to a cloud environment (e.g., AWS, GCP, Azure) or on-premise servers for hosting the gateway.
• An open-source AI gateway solution (LiteLLM or Doubleword are recommended).
• API keys from the LLM providers you intend to support (OpenAI, Anthropic, etc.).
• Role-based access control (RBAC) definitions for your teams (e.g., developer, admin, viewer).
• Basic familiarity with Docker and command-line tools for deployment.
• A cost tracking or logging system (optional but helpful).

Step-by-Step Guide

Step 1: Audit Your Current Model Usage

Before deploying a gateway, map out which teams are using which models, how they access them, and what security or cost issues already exist. Talk to team leads to understand their needs. This audit will help you define routing rules and decide which models to support.

Step 2: Choose Your Gateway Solution

Select an open-source gateway that fits your stack. LiteLLM is excellent for fast integration and supports 100+ LLMs with a simple API. Doubleword offers more advanced routing and observability. Consider your team’s technical skill level and required features. Download the gateway source code or Docker image.

Step 3: Configure Centralized Routing

Set up the gateway to act as a single endpoint. Configure model routes so that requests from different teams or applications are directed to the appropriate LLM. For example, route all chat requests from the marketing team to GPT-4, and code-generation requests from engineering to Claude or Llama. Use environment variables or a YAML config file for routes.

Step 4: Implement RBAC and Security

Define roles and permissions for different users or teams. The gateway should enforce access controls – for instance, only admins can change models, while developers can only query allowed models. Integrate with your existing identity provider (e.g., OAuth, SAML) if possible. Also, set up API key management to prevent unauthorized usage.

Step 5: Enable Cost and Usage Monitoring

Configure logging to capture each inference request: model used, tokens consumed, user/team, and timestamp. Many gateways have built-in dashboards or can export logs to tools like Datadog or Splunk. Set budget alerts per team to avoid surprises. This centralized visibility eliminates inference chaos.

Step 6: Empower Teams While Retaining Control

Announce the new gateway to your teams and provide documentation on how to use it. Allow teams to request new models through a simple ticket system, but maintain final approval. The gateway should let teams experiment quickly – for example, by offering a dropdown of pre-approved models – without sacrificing security or cost control.

Step 7: Test and Iterate

Roll out the gateway to a small set of teams first. Monitor performance, latency, and any errors. Collect feedback and adjust routing rules or permissions. Once stable, expand to all teams. Regularly review usage patterns and update the model catalog.

Tips for Success

• Start with a small, motivated team. Their feedback will shape your rollout.
• Keep model selection flexible. Today’s best model may be obsolete tomorrow; a good gateway makes swapping easy.
• Monitor costs early. Without central oversight, costs can spiral. Set hard limits per team if needed.
• Document everything. Include routing rules, API endpoints, and troubleshooting steps. Share with all teams.
• Use the gateway’s caching features to reduce duplicate calls and save money.
• Plan for failover. If one model provider goes down, the gateway can automatically route to a backup.