OpenAI vs Anthropic
First-party API for GPT models. First-party API for Claude models.
Data notice: This page compares structural differences only. Live token prices are not published here yet — check each provider's official pricing page linked in the table before making a purchasing decision.
Structural comparison
| Dimension | OpenAI | Anthropic |
|---|---|---|
| Provider type | Model vendor | Model vendor |
| Model coverage | GPT family | Claude family |
| Billing model | Pay-per-token | Pay-per-token |
| API format | Native + OpenAI SDK | Native SDK |
| Region | Global | Global |
| Official pricing | official page → | official page → |
How to choose
- Model coverage — confirm the exact model and version you need is served.
- API format — OpenAI-compatible endpoints let you switch by changing the base URL and key.
- Billing — prepaid top-ups suit predictable budgets; pay-per-token suits spiky workloads.
- Region — measure time-to-first-token from your own network, not from a vendor's benchmark.
- Settlement — check invoicing, payment rails and entity before procurement sign-off.
* AIO Keys is operated by LOCOM, which also operates APIvs. It is marked explicitly so you can weigh that bias.
Looking for API access with Vietnam routing and USDT / Alipay settlement?
AIO Keys is our own service. It is listed in every comparison and clearly marked with an asterisk.
See AIO Keys →