Jev model added to the AIBackends API via Vercel AI Gateway

Melvin Vivas · X post · 2026-09-19 · Open on X

Topics: LLMOps, Deployment & Monitoring, AI System Design & Architecture · Level: intermediate

Summary

The creator added support for TypeSafe AI's Jev model to his open-source AIBackends API server, routed through Vercel AI Gateway. Jev was free on the Gateway until Sept 25. The post shows how a gateway lets one backend switch between models and providers.

Key points

• AIBackends (github.com/donvito/ai-backends) is an API server runtime for common AI use cases that supports multiple models and providers.
• It runs locally with Ollama or LM Studio, or in the cloud via OpenRouter, OpenAI, Anthropic and others.
• Jev by TypeSafe AI is now usable in AIBackends through Vercel AI Gateway.
• Vercel AI Gateway offered Jev free until Sept 25 (that promotion has now ended).
• A model gateway lets you add new models to an app without writing separate provider integrations.

Resources mentioned

• AIBackends · repo · aibackends.com · free
  Open-source API server runtime for common AI use cases that supports many models and providers (Ollama, LM Studio, OpenRouter, OpenAI, Anthropic).
  Also in: Building a production website with Opus 5.5 and TanStack (Melvin Vivas on X · notes), CamelFlow: open-source visual viewer for Apache Camel routes (Melvin Vivas on X · notes), AI Backends: A Production AI Workflow Engineering Site (Link Share) (Melvin Vivas on X · notes), Demo: Claude Opus 5.5 Generating a Motion-Graphics Video for AIBackends (Melvin Vivas on X · notes) and 16 more
• Vercel · tool · x.com · free · recommended by both Bashiri Smith & Melvin Vivas
  Deploy web apps and frontends.
  Also in: OpenAI DevDay 2026 Recap: Dots, Agents API, Codex Cloud & Marketplace (Melvin Vivas on X · notes), 7 Habits to Become an AI Engineer: Books, Tooling, Research & Shipping (Bashiri Smith on Facebook · notes), Open models now dominate token volume on Vercel AI Gateway (Melvin Vivas on X · notes), Adding Vercel AI Gateway as a provider in AIBackends with Devin (Melvin Vivas on X · notes) and 7 more
• TypeSafe AI (@typesafeai) on X · person · x.com · free
  The X account of TypeSafe AI, the company that makes Jev and the System One models.
  Also in: Using Jev (TypeSafe AI) as a Decision Model for Email Classification (Melvin Vivas on X · notes), Building a Jev Session-History Tool with Codex and Astra (Melvin Vivas on X · notes), Not every problem needs an LLM: small fine-tuned models (Jev by TypeSafe AI) (Melvin Vivas on X · notes), AIBackends: An API Layer Between Your App and AI Models (Now with Jev) (Melvin Vivas on X · notes) and 6 more
• Jev · tool · typesafe.ai · paid
  A decision model that makes turn-level forecasts on AI agent conversations using only structural signals (turns, tool calls, workflow stages, timing).
  Also in: Generating a Repo Promo Video with a Claude Skill on Sonnet 5.5 vs Opus 5.5 (Melvin Vivas on X · notes), GLiDE by Fastino Labs: A Post-Trainable Reasoning Decision Model (Melvin Vivas on X · notes), Using Jev as a Reranker to Augment RAG Retrieval (Melvin Vivas on X · notes), Using Jev (TypeSafe AI) as a Decision Model for Email Classification (Melvin Vivas on X · notes) and 12 more

Try this

• Try Jev through the AIBackends API via Vercel AI Gateway (the free period ended Sept 25).