A Claude API alternative that keeps the OpenAI interface

If you want Claude but your stack already speaks OpenAI, Vynex lets you call Claude Opus, Sonnet and Haiku through the standard /v1/chat/completions interface — alongside GPT and Gemini, from one key.

No Anthropic SDK required if you do not want one.

Full family

Claude models

Opus, Sonnet, Haiku 4.x.

OpenAI

Interface

No Anthropic SDK needed.

+5 families

Also includes

GPT, Gemini, DeepSeek, Qwen, GLM.

Per token

Pricing

Transparent, no minimum.

Vynex vs direct Anthropic

Feature	Vynex API	direct Anthropic
Claude Opus / Sonnet / Haiku	✓	✓
OpenAI-compatible interface	✓	Anthropic SDK
Same key for GPT & Gemini	✓	✗
Streaming + tool calling	✓	✓
Per-token pricing	✓	✓

FAQ

Can I really call Claude with the OpenAI SDK?

Yes. Point the OpenAI SDK base_url at Vynex and pass a Claude model name. The request/response shape is OpenAI-compatible; streaming and tool calling work the same way.

Which Claude models are available?

The Claude 4.x family including Opus, Sonnet, and Haiku. See /pricing for the current list and rates.

Get your API key →

See pricing·Docs