The best AI routers and LLM routers in 2026, compared

Nine AI routers and gateways, compared on what each vendor publishes about itself: what it is, how it picks the model, where it runs, your own provider keys and pricing. The Smart Router is ours and is listed first; every other entry is described from its vendor’s own pages, checked 30 October 2026.

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9: AI routers and gateways, each described in its vendor’s own terms.
19: vendor pages cited, every one linked under Sources.
14: auto-* modes in the Smart Router, ranked on public benchmark results.

How to choose an AI router

Six questions separate the options more than any feature list does.

What decides the model?: Rules you write, price, a prompt classifier, what other users pick, or test results. It is the part of a router you cannot see from its API, and it decides what each request costs and how well it is answered.
Whose keys pay for the tokens?: Credits bought from the router, your own provider keys, or both. With your own keys, each provider bills you directly, under your own terms and limits.
Is there a markup?: A percentage on tokens, a fee on credits or above an allowance, a platform fee, or a flat plan. Read the pricing page together with the page on your own keys.
Where does it run?: Hosted, so there is nothing to operate, or self-hosted, so the proxy runs on your own servers.
What happens when a provider fails?: Fallbacks to another model or provider, retries, and whether a failing model is taken out of rotation for a while.
Does it tell you why?: Whether each response names the model that answered and the reason it was chosen, so a routing decision can be checked after the fact.

AI routers at a glance

What each router is and how it picks the model, in its vendor’s own terms.

9 AI routers and gateways. The Smart Router from its own code and plan table; the others as checked 30 October 2026 on each vendor’s own pages, linked under Sources.
Router	What it is	How it picks the model
AI Stupid Level Smart Router	An AI router with an OpenAI-compatible endpoint and a native Anthropic Messages endpoint, in front of 25 models from 6 providers on the leaderboard, all tested on the same tasks on the same schedule.	Its 14 auto-* modes rank on the public benchmark boards for coding, reasoning, tool use or all three, re-tested coding every four hours, reasoning and tool use daily, with an hourly canary probe, or on response time, price or a split you set. Statistical ties go to your tie-break, cheapest per task by default. The value modes pick within 5 points of the best, then the lowest cost of a scored run. A model whose drift detector has fired, or that has an open canary incident, moves behind the healthy ones, and every response names the model and why it won.
OpenRouter	One OpenAI-compatible API in front of hundreds of models from many providers, with routing, fallbacks and cost tracking.	Its Auto Router gives each prompt one of about 30 task types with a lightweight classifier, then ranks models by what the OpenRouter community spends on for that task over a trailing 7-day window. Among the providers of one model, a request goes by each provider’s price, throughput, latency and reliability, with fallbacks when one fails.
Requesty	A unified AI gateway, LLM router and OpenAI-compatible API for 600+ AI models.	Cost-based, latency-based and availability-based routing, automatic failover chains and weighted load balancing across models.
Vercel AI Gateway	A managed gateway for calling models across providers, with central credentials, request logs, spend budgets and failover.	Routes requests across providers and fallback models; you can set a provider order and ordered model fallbacks.
LiteLLM	An open-source AI gateway and LLM proxy that puts an AI stack behind one OpenAI-compatible API, for 140+ providers.	Load balancing across providers, regions and keys, with fallbacks and model aliases; virtual keys carry hard budgets and rate limits.
Portkey	An AI gateway whose core is open source, run locally with one command or self-hosted and connected to Portkey.	Fallbacks between providers and models, load balancing between API keys, and conditional routing on checks you define.
Cloudflare AI Gateway	A gateway to observe and control AI applications, with request retries and model fallbacks in case of an error.	Dynamic routing checks conditions on the request body, headers or metadata, splits traffic by percentage, and switches to a fallback model when a request or budget quota is exceeded.
Helicone AI Gateway	A unified API for 100+ LLM providers in the OpenAI SDK format, part of Helicone’s open-source LLM observability platform.	Automatic failover across providers, with routing and fallbacks you configure.
Not Diamond	An intelligent model router for coding agents.	Predicts which model to use for each input, aiming to cut cost while keeping accuracy.

The best AI routers, one by one

Where each one runs, how it handles your own provider keys and what it costs, wherever the vendor publishes it.

1. AI Stupid Level Smart Router: An AI router with an OpenAI-compatible endpoint and a native Anthropic Messages endpoint, in front of 25 models from 6 providers on the leaderboard, all tested on the same tasks on the same schedule.
How it picks the model. Its 14 auto-* modes rank on the public benchmark boards for coding, reasoning, tool use or all three, re-tested coding every four hours, reasoning and tool use daily, with an hourly canary probe, or on response time, price or a split you set. Statistical ties go to your tie-break, cheapest per task by default. The value modes pick within 5 points of the best, then the lowest cost of a scored run. A model whose drift detector has fired, or that has an open canary incident, moves behind the healthy ones, and every response names the model and why it won.
Where it runs. Hosted. Requests go to each provider with your own key; nothing is resold.
Your own provider keys. Always your own provider keys, stored encrypted with AES-256-GCM, at every volume.
Pricing. No markup on tokens: providers bill you directly at their own list price. Free: 1,000 routed requests a month on every provider and every mode, with your own provider keys and no card. Pro Intelligence $12/mo for 10,000 routed requests a month; Developer $25/mo for 100,000. Past an allowance, top-up credits at $1 per 2,000 requests, minimum $5, that do not expire.
2. OpenRouter: One OpenAI-compatible API in front of hundreds of models from many providers, with routing, fallbacks and cost tracking.
How it picks the model. Its Auto Router gives each prompt one of about 30 task types with a lightweight classifier, then ranks models by what the OpenRouter community spends on for that task over a trailing 7-day window. Among the providers of one model, a request goes by each provider’s price, throughput, latency and reliability, with fallbacks when one fails.
Where it runs. Hosted.
Your own provider keys. Supported. Pay-as-you-go includes $25,000 a month of list-price usage with no fee on your own keys; above that, the fee is 5% of what the same model and provider would cost on OpenRouter.
Pricing. Provider prices passed through with no markup on inference; a fee applies when you buy credits. Free models carry low rate limits: 50 requests a day, or 1,000 a day after buying at least 10 credits.
3. Requesty: A unified AI gateway, LLM router and OpenAI-compatible API for 600+ AI models.
How it picks the model. Cost-based, latency-based and availability-based routing, automatic failover chains and weighted load balancing across models.
Where it runs. Hosted, at router.requesty.ai.
Your own provider keys. Bring your own keys is listed on the pay-as-you-go plan.
Pricing. Free plan with 200 requests a day; pay as you go carries a 5% markup; Enterprise is custom.
4. Vercel AI Gateway: A managed gateway for calling models across providers, with central credentials, request logs, spend budgets and failover.
How it picks the model. Routes requests across providers and fallback models; you can set a provider order and ordered model fallbacks.
Where it runs. Hosted by Vercel; your application does not need to run on Vercel.
Your own provider keys. Your own keys carry no markup or fee and need the paid tier, which means purchased credits.
Pricing. No markup and no platform fee on tokens. The free tier covers a subset of models with per-model rate limits; some optional features are charged separately.
5. LiteLLM: An open-source AI gateway and LLM proxy that puts an AI stack behind one OpenAI-compatible API, for 140+ providers.
How it picks the model. Load balancing across providers, regions and keys, with fallbacks and model aliases; virtual keys carry hard budgets and rate limits.
Where it runs. Self-hosted. MIT-licensed and free to self-host.
Pricing. Free to self-host; Enterprise adds SSO, RBAC, audit logs and support, priced on request.
6. Portkey: An AI gateway whose core is open source, run locally with one command or self-hosted and connected to Portkey.
How it picks the model. Fallbacks between providers and models, load balancing between API keys, and conditional routing on checks you define.
Where it runs. Hosted, or the open-source gateway on your own servers.
Pricing. Developer plan free with 10k recorded logs a month and 3-day log retention; Production $49 a month; Enterprise custom.
7. Cloudflare AI Gateway: A gateway to observe and control AI applications, with request retries and model fallbacks in case of an error.
How it picks the model. Dynamic routing checks conditions on the request body, headers or metadata, splits traffic by percentage, and switches to a fallback model when a request or budget quota is exceeded.
Where it runs. Hosted on Cloudflare, available on all plans.
Your own provider keys. You can store provider API keys in the Cloudflare dashboard and reference them from the gateway.
8. Helicone AI Gateway: A unified API for 100+ LLM providers in the OpenAI SDK format, part of Helicone’s open-source LLM observability platform.
How it picks the model. Automatic failover across providers, with routing and fallbacks you configure.
Pricing. Credits with 0% markup. Hobby plan free with 10,000 requests, 1 GB storage and one seat; Pro $79 a month; Team $799 a month.
9. Not Diamond: An intelligent model router for coding agents.
How it picks the model. Predicts which model to use for each input, aiming to cut cost while keeping accuracy.

What sets the Smart Router apart?

It chooses the model from public benchmark results that anyone can check, and it adds nothing to token prices.

Routes on test results: Every model on the leaderboard runs the same coding, reasoning and tool-use tasks, coding every four hours, reasoning and tool use daily, with an hourly canary probe. Each auto-* mode sends the request to the model placing highest on the board for that job, among the providers you hold keys for.
Notices when a model changes: A drift detector per suite and an hourly canary watch every model. A model whose detector has fired, or that has an open canary incident, moves behind the healthy ones.
Your keys at every volume: Requests always go out with your own provider keys, stored with AES-256-GCM. Nothing is resold and nothing is added per token.
Free to start: Free includes 1,000 routed requests a month on every provider and every mode, with your own provider keys and no card.
Explains every pick: The X-AISM-Reasoning header names the model, the provider and the reason, including any model passed over for drift or an outage.

The methodology is public: every weight, statistical test and drift constant. The test tasks are private, so no lab can train on them. Every rule is on the Smart Router page, every endpoint in the router documentation, and how the boards are scored on the methodology page.

Sources

Checked 30 October 2026 on each vendor’s own pages. Products change: follow the links for current details, and tell us at contact if something here is out of date.

Questions about choosing an AI router

What is the world’s best AI router?

No router is best for every team, so the useful answer is a set of criteria: what decides the model, whose keys pay for the tokens and at what markup, where it runs, how it fails over, and whether it explains each choice. The Smart Router is built for teams who want the model chosen from public benchmark results, their own provider keys at every volume, no markup on tokens, and the reason for every pick in the response. This page sets the main options side by side, each from its vendor’s own pages.

What is the best LLM router for coding?

One that ranks models on coding results. The Smart Router’s auto-coding mode ranks on the Coding board: repository bug fixes graded by running the project’s own tests, re-run every four hours. It works in Claude Code through the native Anthropic endpoint and in Cursor, Cline and Aider through an OpenAI base URL. The board itself is on best LLM for coding.

What is the best free AI router?

The Smart Router’s Free plan includes 1,000 routed requests a month on every provider and every mode, with your own provider keys and no card. Routing itself is not paywalled, and tokens are billed by each provider to your own account at its own list price. The free plans of the other routers on this page are listed with each one.

What is the difference between an AI router and an AI gateway?

A gateway is the plumbing in front of the providers: one endpoint, keys, logs, budgets and retries. A router is the decision: which model answers each request. Most products here are some of both. What an AI router is explains the signals routers choose by, and AI aggregator covers the access side.

Is OpenRouter an AI router?

Yes. OpenRouter puts hundreds of models behind one OpenAI-compatible API, and its Auto Router picks a model for each prompt from its task type and what the OpenRouter community spends on for that task. OpenRouter alternatives compares it with the other options and shows how to switch.

How was this comparison put together?

Each entry restates what its vendor’s own pages said on 30 October 2026, and those pages are linked under Sources. Nothing is taken from review sites or from other vendors’ comparisons, and no entry says what a product lacks. If something has changed, tell us through the contact page.

Route on benchmark results

Free includes 1,000 routed requests a month on every provider and every mode, with your own provider keys and no card.

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See the boards it routes on

Coding, Reasoning, Tool use and Combined, over 24 hours, 7 days and 30 days.

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What an AI router is AI aggregator OpenRouter alternatives Smart Router Router documentation