Where AI/ML API fits
If you prefer a predictable monthly bill — a fixed subscription tier with a credit allowance baked in — AI/ML API's pricing structure is familiar. It's the same mental model as Notion or Linear, just for AI inference. That structure is genuinely useful for solo developers experimenting where the variable cost of pay-as-you-go feels stressful. AI/ML API also covers 300+ models, which is broader than Kunavo's curated frontier set.
Where Kunavo wins
Three places. (1) Pricing transparency — every model's per-1M-token rate is published at /pricing and the catalog uniformly sits 30% under upstream official, so the math is the same for everyone. (2) No subscription, no expiration — top-up balance never decays, and there's no monthly minimum to commit to. (3) Stripe-native global payments — cards, Apple/Google Pay, ACH, SEPA, Alipay, WeChat Pay are all in scope, which makes self-serve onboarding work in Asia and Europe without an enterprise sales flow. The Claude Messages API is also native (/v1/messages), so Anthropic SDK users don't have to migrate to OpenAI shape if they don't want to.
How to pick
Pick AI/ML API if a predictable monthly subscription matters to you and you're OK with credits that expire. Pick Kunavo if you want true pay-as-you-go with no expiration, want the lowest catalog price by default rather than tier-gated, or are shipping to a global audience that pays in local currencies.