Pricing · updated 2026-05-29
Pay-as-you-go.
Zero surcharge, no subscription.
Top up your balance via Stripe. Zero platform fee on any request. Zero BYOK surcharge during early access. Stripe processing fee on us. Promo top-ups stack additional discounts. No monthly minimum, no per-seat fees, no plan tiers.
Platform key
Zero platform fee
- We hold keys to Anthropic / OpenAI / Google / others
- Top up your balance via Stripe; pay only for tokens consumed
- Zero surcharge on every request
- Cache reads at ~10% of normal input price
BYOK
0% BYOK surcharge
- Add your own provider keys to the workspace vault
- Keep using your existing provider account
- Synthorai surcharge waived during early access (0%)
- Per-model whitelist, fallback toggle, audit log
$50 launch top-up
$50 → 10% off 30 days
- Fund $50, get extra 10% off platform-key requests
- 30-day discount window, balance never expires
- Stacks with normal usage
- Refundable within 7 days
High volume? Additional discounts apply beyond list price: talk to us about volume.
Why it's cheaper than an aggregator
A $100 top-up, same models, same provider list prices across chat, image and audio. The gap is fees.
Sample prices
Per million tokens, USD. Exactly what each request draws from your balance, zero surcharge added. A spread across the catalogue, pulled live at build time.
| Provider | Model | Input ($/Mtok) | Output ($/Mtok) |
|---|---|---|---|
| Alibaba | qwen3-vl-flash | $0.05 | $0.4 |
| ByteDance | Dola-Seed-2.0-mini | $0.1 | $0.4 |
gemini-2.5-flash-lite | $0.1 | $0.4 | |
gemini-3-pro-image-preview | $2.00 | $120.00 | |
| Anthropic | claude-fable-5 | $10.00 | $50.00 |
| OpenAI | gpt-5.4-pro | $30.00 | $180.00 |
Compare all 79 model prices, live → Filter by provider, sort by price, always in sync with the gateway.
Prompt caching: cache reads ~10% of input price, cache writes ~125% of input price (Anthropic schedule). Cross-provider translation details in our prompt caching post.
FAQ
Is there a subscription or monthly minimum?
No. Pay-as-you-go. Top up your balance once, requests draw from it as you use them. Unused balance carries over indefinitely.
Are there any platform fees or surcharges?
None. Zero platform fee on any request. Zero BYOK surcharge during early access. Stripe processing fee on us. Your balance is debited exactly by what each request consumes.
How does prompt caching pricing work?
Cache reads cost ~10% of input price (Anthropic schedule). Cache writes (first call within TTL) cost ~125% of input. We pass these through directly. Cross-provider caching translation is documented in Prompt Caching Across LLM Providers.
What about refunds?
Unused balance refundable within 7 days, no questions asked. Stripe processes the refund directly. We keep your balance correct even if requests die mid-flight. For billing you can verify, see our gateway cache-billing audit.
How does Synthorai compare to OpenRouter?
Same model list prices, but without the extra fees: no payment-processing surcharge, and BYOK is free during early access. See the full OpenRouter alternative comparison.
Start with whatever fits
Free signup, fund $1 if you want to try, top-up promo when you're ready.