OpenRouter alternative

AIgateway: the best OpenRouter alternative in 2026

The best OpenRouter alternative in 2026 is AIgateway. Both are OpenAI-compatible gateways, but AIgateway covers every modality (text, image, video, voice, audio, music, embeddings) behind one schema, charges a flat 5% platform fee at top-up instead of per-call markups, and ships a sub-account API plus eval-driven routing — primitives OpenRouter does not offer.

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Feature comparison

AIgateway vs OpenRouter

Side-by-side on the dimensions that move a production decision.

Feature

AIgateway

OpenRouter

Modalities covered

Text, image, video, voice, audio, music, embeddings

Text only

Platform fee

5% flat at top-up

Variable markup + per-call fees

OpenAI-compatible

Yes

Sub-account API

Yes — scoped keys + spend caps

Eval-driven routing

Yes — bind evals to aliases

Replay / shadow A/B

Yes on every logged request

Free tier

100 req/day Kimi K2.6, no card

Limited free credits

Cache billing

10% of uncached on hits

Full rate

Feature comparison reflects public documentation as of 2026. OpenRouter pricing shape: Variable markup per model; per-call fees on some routes.. Catalog: ~300 text-only models..

Migrate in 5 minutes

Three steps. One base URL.

If you're on OpenRouter through the OpenAI SDK, you're 90% of the way there. Change the base URL and the key.

STEP 01

Sign up for AIgateway

Create an account at aigateway.sh/signin and copy an sk-aig-... key from the dashboard.

STEP 02

Swap base URL + key

from openai import OpenAI

client = OpenAI(
    base_url="https://api.aigateway.sh/v1",
    api_key="sk-aig-...",
)

STEP 03

Ship

Request shape, response shape, streaming SSE — identical to OpenAI. Model slugs map 1:1 on shared providers. OpenRouter users typically migrate in under 5 minutes.

4 other alternatives

Other OpenRouter alternatives worth checking

Honest take: here are four other credible options. None ship the full multi-modal catalog + sub-accounts + evals under one key, but each has a legit wedge.

#2 — Governance gateway

Portkey

LLM gateway-as-a-service focused on governance and observability.

Partially open source · ~40 models, mostly text + some image.

Read the full Portkey comparison →

#3 — Observability proxy

Helicone

LLM observability proxy — strong at logging, not a routing layer.

Open source · Pass-through proxy — whatever providers you wire up.

Read the full Helicone comparison →

#4 — LLM router

Requesty

Cost-aware text-LLM router.

Closed source · ~50 text models.

Read the full Requesty comparison →

#5 — Eval platform

Braintrust

AI evaluation platform with a proxied inference layer.

Partially open source · Proxies upstream providers; no first-party multi-modal catalog.

Read the full Braintrust comparison →

FAQ

Common questions about OpenRouter alternatives

Is OpenRouter open source?

No. OpenRouter is a closed-source commercial product. AIgateway is also closed-source but ships OpenAI-compatible wire format so migration is a one-line base_url change.

Does OpenRouter charge markups?

OpenRouter applies variable markups per model and per-call fees on some routes. AIgateway charges a single flat 5% platform fee at credit top-up — no per-call surcharge.

Does OpenRouter have a free tier?

OpenRouter offers limited free credits on select community models. AIgateway offers 100 requests/day on Kimi K2.6 with no card required, plus free cache reads at 10% of uncached cost.

Can I use the OpenAI SDK with OpenRouter or AIgateway?

Yes to both — both are OpenAI-compatible. With AIgateway, point base_url to https://api.aigateway.sh/v1 and swap the key. No other code changes.

Does OpenRouter support image, video, or voice?

No — OpenRouter is text-only. AIgateway covers image, video, voice, audio, music, and embeddings under the same OpenAI-compatible schema.

Can I bring my own API keys to OpenRouter?

OpenRouter offers BYOK on some providers. AIgateway supports BYOK on every provider and waives the 5% platform fee on BYOK calls.