OpenRouter vs Vercel Eve: Model Gateway vs Filesystem Agent Framework

OpenRouter's core function is a single OpenAI-compatible API exposing 500+ models across 80+ providers with automatic failover and unified billing; Vercel Eve does not route models — it consumes whichever model you point at the gateway.

Eve is model-agnostic through Vercel AI Gateway, but that is a consumption path, not a multi-provider routing product.

Vercel Eve compiles an agent directory into a durable production service with durable execution, sandboxed compute, human-in-the-loop, subagents, OpenTelemetry, and evals; OpenRouter has no agent-building surface at all.

Eve is TypeScript-only and Vercel-coupled; OpenRouter is an inference layer, not an agent framework.

OpenRouter is purpose-built for model comparison and zero-code model switching via one endpoint; Eve inherits whichever model you configure on the AI Gateway.

Both avoid model lock-in, but OpenRouter is built specifically for it.

Vercel Workflow SDK gives Eve sessions that survive crashes, cold starts, and redeploys; OpenRouter is a stateless per-request relay with no execution state to persist.

Statelessness is a feature for OpenRouter (cheap, predictable), not a defect.

One integration for every model with no subscription ('the Stripe for AI'); Eve's lock-in is platform-level (Vercel), not model-level.

OpenRouter's ~5.5% platform fee and unconfirmed Stripe acquisition temper the neutrality story.