Comparison · updated 2026-10-06

Synthorai vs OpenRouter

Synthorai and OpenRouter are both multi-provider gateways that let you bring your own provider keys (BYOK), and the per-token price is the same. The differences are fees and caching. Synthorai charges no payment-processing fee on top-ups and a 0% BYOK surcharge. It also pins cache-enabled requests to one upstream and translates cache controls across providers.

Same price, fewer fees. Per-token pricing matches OpenRouter, but there's no fee when you top up, and BYOK is free (you pay the provider directly).

Caching pinned to one upstream. Synthorai keeps cache-enabled requests on the same upstream and translates cache controls across providers.

Region pinning and no-training defaults. Region pinning in the US, EU or APAC. By default you only reach models that don't train on your data, and ones that might are opt-in.

Same API, no lock-in. Synthorai is OpenAI-compatible: point your base URL at it, keep your code, and leave whenever you want.

Where do they differ?

Capability	Synthorai	OpenRouter
Per-token model price	Provider list price	Provider list price
Payment-processing fee on top-ups	✅ none	⚠️ about 8% on credit purchases (5.5% platform + 2.5% payment)
BYOK surcharge	✅ 0% (free); pay the provider directly	⚠️ free up to $25k of list-price usage a month, then 5%
Quota accounting under failure	✅ crash-safe (pre-deduct → settle / refund + auto-reconcile)	⚠️ not documented
Provider data policy	✅ no-training models by default; data-training models opt-in	⚠️ per their policy
Traces and prompt library	✅ one trace per agent run, sessions, a prompt library with ids and versions	⚠️ request logs; no prompt library
Governance	✅ Enterprise: team budgets, approvals, guardrail rules, data classification	⚠️ per-key limits
Where it runs	✅ SaaS, a managed dedicated instance, or your own network	SaaS only
OpenAI-compatible endpoint	✅	✅

Why do teams switch from OpenRouter?

Same price, minus the fees. Per-token pricing matches OpenRouter's. Synthorai charges no payment-processing fee when you top up via Stripe and a 0% surcharge on BYOK traffic. OpenRouter adds about 8% in fees on credit purchases (5.5% platform + 2.5% payment) and 5% on BYOK usage above $25k a month.

Caching that keeps hitting. Prompt caching only pays off when repeat requests reach the upstream that holds the cache.

Spread traffic across keys or providers and you lose those hits and pay full input price again. Synthorai pins a workspace's cache-enabled requests to one upstream key (cache affinity) and translates cache controls across Anthropic, OpenAI and Gemini.

How prompt caching works across providers.

Billing that holds up under failure. Synthorai pre-deducts an estimate, then settles against the provider's reported usage.

If a request dies mid-stream, an in-flight ledger and a reconciler refund the hold automatically. A crash must never corrupt funds, quota or state. How we audit billing.

Region pinning and no-training defaults. Region pinning in the US, EU or APAC. By default Synthorai serves only models that don't train on your data. Any model whose provider may train on submitted data is off unless you opt in, per workspace.

Built for teams, with keys you govern. Keys sit in an encrypted vault per workspace, with per-model allowlists and a "never fall back to the platform key" flag. Prompt and response bodies are not stored by default. Workspaces have admin and member roles and per-key quota, and request logs keep each provider's reported usage for reconciliation.

What do you pay?

Per-token pricing is the same on both; the difference is what each adds on top of usage.

Synthorai: top up your balance via Stripe with no processing fee. Requests draw it down at the same per-token price you'd pay on OpenRouter. BYOK requests bypass the balance entirely: 0% surcharge, and you pay the provider directly. Full pricing.

OpenRouter: same per-token price, plus about 8% in fees when you buy credits and 5% on BYOK usage above $25k a month.

The per-token price is the same, so the difference is those two fees.

How do you migrate from OpenRouter?

Sign up and get your API key. The first 10 calls are free, up to $1. With the $50 launch promo, a $50 top-up gets 10% off platform-key requests for 30 days.
Swap the base URL. Our endpoint is OpenAI-compatible; most OpenRouter clients move with two env vars:
```
OPENAI_BASE_URL=https://synthorai.io/v1
OPENAI_API_KEY=sk-syn-...
```
Move your BYOK keys. Re-add the same provider keys in the workspace vault, one per provider, and scope them per model if you need to. The surcharge on BYOK traffic is 0%.
Recreate your team structure. If you segmented teams with OpenRouter API keys, model them as Synthorai workspaces with per-key quota and roles.
Cut over gradually. Keep a client for each base URL, send a small share of requests to Synthorai first, then all of them once you're satisfied. Nothing locks you in either direction.

Top up $50, get 10% off for 30 days Or start pay-as-you-go

Comparison updated 2026-10-06. OpenRouter's pricing and features may change; if anything here is out of date, email support@synthorai.ai and we'll correct it.