When to Use the Official API and When to Use a Compatible Gateway (2026 Decision Table)
Not 'which is better' but 'what are your constraints'. Clear answers for four scenarios — including the cases where you should not use us.
1. Check for non-negotiable constraints first
This step can eliminate every comparison below. Direct vendor relationship: some procurement processes require a direct contract with the model vendor; a gateway does not fit. SLA: if your service makes contractual availability commitments, your upstream must offer matching commitments, and gateways cannot provide vendor-level SLA. Data compliance: some industries specify which entities data may pass through; every extra hop is another party to assess. If any of the three applies, the answer is official — stop reading.
2. Card will not go through: the most common real reason
Many people researching 'which should I choose' actually started from the official payment step failing. The cause is fixed: overseas acquirers identify the issuing institution's country from the card's first 6-8 digits (BIN) and score risk accordingly; cards issued in mainland China pass at low rates regardless of balance, and switching to another Chinese bank or another card network changes nothing. Two ways forward: get a card whose issuing country is accepted and stay official (keeping the direct relationship and SLA), or use a compatible gateway that accepts local payment. Decide first how much those two things matter to you.
3. Multi-vendor evaluation: the gateway's real advantage
Choosing between Claude, GPT and Gemini the official way means three registrations, three card bindings, three sets of keys and balances. A compatible gateway's value is concrete here: one key, one balance, change base_url to switch models — evaluation friction drops to nearly zero. That is a real efficiency gain for technology selection and product research. Decide afterward whether to move back to official.
4. Mixing is underrated
In practice many teams' optimum is layered, not either/or: production on official (stability, SLA, direct relationship), development and testing on the gateway (no payment hassle, easy model switching, lower cost). Both use the same OpenAI-compatible code; switching is configuration. You keep production reliability and development flexibility. The one caveat: align model versions on both sides, or behavior validated in development may differ in production.
5. What to verify when choosing a gateway
If you go with a gateway, verify at least three things first: ① whether the model is real — the most common problem is billing for one model and serving a cheaper one, invisible to the eye, so test with fixed probes (the open-source tool probe.cocodot.co runs against any OpenAI-compatible endpoint, including the cocodot that publishes it); ② who operates it — a prepaid balance makes you its unsecured creditor, so at minimum find clear company information and terms; ③ whether your model is listed — 'supports all models' is marketing; check the model list endpoint yourself.
6. Where we stand
Disclosure: this page is published by cocodot, and we provide the second kind (an OpenAI-compatible gateway). By the criteria above, if you need a direct vendor contract or contract-level SLA, we are not for you — stated up front rather than buried in terms. We fit developers whose card will not go through but whose project must move, teams evaluating several vendors, and teams that layer development/testing and production. Prices sit below list and never above it — see cocodot.co/pricing; model integrity is verifiable with the open-source tool above, so you need not take our word for it.
7. A practical suggestion
Do not treat this as a permanent decision. Run both at minimum cost first: if your card works on official, pay for one small month; on the gateway, top up the minimum; run the same tasks on both and compare response quality, speed and actual spend. A week later you will have a conclusion grounded in your own scenario — more accurate than any review. The cost of deciding is far below the cost of migrating after a wrong choice, and that week costs almost nothing.
Four scenarios, four answers
| Your situation | Recommendation | Why |
|---|---|---|
| Corporate procurement needing a direct vendor relationship | Official | Cases that require a direct contract with the vendor |
| Production system needing contract-level SLA | Official | Gateways cannot offer vendor-level service commitments |
| Card keeps failing, project stalled | Gateway | Switching banks does nothing against BIN-based issuing-country checks |
| Evaluating several vendors' models | Gateway | One key, one balance, no repeated sign-ups and payments |
| Personal learning / small project | Either | Pick whichever is handier; amounts are small |
| Both production and development | Mix | Production official for stability, development on gateway for convenience |