Comparison · updated 2026-06-18
Synthorai vs OpenRouter
Synthorai vs OpenRouter Synthorai and OpenRouter are both BYOK-capable, multi-provider gateways, and the per-token price is the same. The two reasons teams switch to Synthorai are fees and cache: you pay that same price without the extras OpenRouter adds — no payment-processing fee on top-ups and a 0% BYOK surcharge — and your prompt cache keeps hitting, because Synthorai pins cached requests to one upstream instead of letting cross-provider routing silently break them.
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).
Your cache keeps working. Synthorai keeps cache-enabled requests on the same upstream and translates cache controls across providers, so you don't lose cache hits — and pay full price — the way pass-through routing can.
Built for enterprise and compliance. Compute runs overseas, never through sensitive jurisdictions — and by default you only reach models that don't train on your data; ones that might are opt-in.
Same API, no lock-in. Synthorai is OpenAI-compatible — point your base URL at it, keep your code, leave whenever you want.
Where it counts
| Capability | Synthorai | OpenRouter |
|---|---|---|
| Per-token model price | Same as OpenRouter | Same as Synthorai |
| Payment-processing fee on top-ups | ✅ none | ⚠️ fee on credit purchases |
| BYOK surcharge | ✅ 0% — free; pay the provider directly | ⚠️ BYOK fee applies |
| Prompt cache across providers / keys | ✅ no drift — cache affinity pins one upstream + cross-provider cache translation | ⚠️ pass-through; routing can miss the cache |
| Quota accounting under failure | ✅ crash-safe (pre-deduct → settle / refund + auto-reconcile) | ⚠️ not documented |
| BYOK governance | ✅ per-model whitelist + "never fall back to our key" | — |
| Data residency | ✅ overseas compute only — no transit through sensitive jurisdictions | — |
| Provider data policy | ✅ no-training models by default; data-training models opt-in | ⚠️ per their policy |
| Prompt / response logging | ✅ none — metadata only | ⚠️ per their policy |
| Multi-tenant teams | ✅ workspaces + roles + per-key quota | ⚠️ API-key sharing |
| OpenAI-compatible endpoint | ✅ | ✅ |
Why teams switch
Same price, minus the fees. Synthorai's per-token pricing matches OpenRouter's — the difference is the extras. There's no payment-processing fee when you top up a wallet via Stripe, and BYOK traffic carries a 0% surcharge, so you simply pay the provider for it. OpenRouter adds a fee on credit purchases and a BYOK fee on top. Same models, same usage, lower total — by exactly those fees.
Caching that doesn't drift. Prompt caching only pays off if repeat requests land on the same upstream that holds the cache. When a gateway spreads traffic across keys or providers, those cache hits quietly disappear and you pay full input price again. Synthorai pins cache-enabled requests from a workspace to one upstream key (cache affinity) and translates cache controls across Anthropic, OpenAI and Gemini — so the discount you designed for actually lands. How prompt caching works across providers.
Billing you can trust under failure. Synthorai pre-deducts an estimate, then settles against the provider's reported usage; if a request dies mid-stream, an inflight ledger and reconciler refund the hold automatically. The rule is explicit: a crash must never corrupt funds, quota, or state. How we audit billing you can verify.
Built for enterprise and compliance. All inference runs on overseas infrastructure, so your prompts and keys don't transit sensitive jurisdictions. And 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 explicitly opt in, enforced per workspace.
Built for teams, with keys you govern. Per-workspace encrypted vault with per-model whitelisting and a "never use the platform key" flag, zero prompt/response retention, workspaces with roles and per-key quota, and an audit log that stores each provider's raw usage for reconciliation.
What you actually pay
Per-token pricing is the same on both — the difference is what each adds on top of usage.
Synthorai — top up a wallet via Stripe with no processing fee; requests decrement it at the same per-token price you'd pay on OpenRouter. BYOK requests bypass the wallet entirely: 0% surcharge, you pay the provider directly. Full pricing.
OpenRouter — same per-token price, plus a fee when you buy credits and a fee on BYOK traffic.
Same models, same per-token price — what you save is exactly the fees OpenRouter adds on top: the top-up fee, and the BYOK fee.
Migration steps (OpenRouter → Synthorai)
- Sign up and top up. The $50 launch promo adds 10% off every model for 30 days while you evaluate.
- Swap the base URL. Our endpoint is OpenAI-compatible; most OpenRouter clients move with one env var:
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. 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. Run both base URLs in your SDK, route 90/10, then 100% once you're satisfied. Nothing locks you in either direction.
Comparison updated 2026-06-18. OpenRouter's pricing and features may change; if anything here is out of date, email support@synthorai.ai and we'll correct it.