# Vynex API

> Vynex API is a unified LLM gateway. It exposes a single OpenAI-compatible
> `/v1` endpoint that routes to GPT-5.x, Claude (Opus/Sonnet/Haiku 4.x),
> Gemini 3.x, DeepSeek, Qwen, and GLM. Developers keep their existing OpenAI
> SDK, change the base_url, and select models by name.

Vynex API lets developers call every major frontier LLM — GPT, Claude,
Gemini, DeepSeek, Qwen, and GLM — from a single OpenAI-compatible API endpoint
(https://llm-api.vynexcloud.com/v1). There is no new SDK to learn and no
integration code to rewrite: point any OpenAI-compatible client at the Vynex
base_url and switch models by changing the `model` field. Streaming,
function/tool calling, and the standard OpenAI request parameters are
supported. Pricing is per-token and published transparently.

## Use cases
- Testing and A/B-comparing frontier models without re-integrating each one
- Building LLM fallback chains across model families
- Calling GPT/Claude/Gemini from a single key and bill
- Using cheaper or open models in AI coding assistants (Cursor, Cline) via a
  custom OpenAI base URL

## Quick start
```python
from openai import OpenAI
client = OpenAI(
    api_key="sk-...",
    base_url="https://llm-api.vynexcloud.com/v1",
)
resp = client.chat.completions.create(
    model="claude-opus-4-8",
    messages=[{"role": "user", "content": "Hello"}],
)
```

## Model families available
- OpenAI: gpt-5.5, gpt-5.4, gpt-5.4-mini, gpt-5.4-nano
- Anthropic: claude-opus-4-8, claude-opus-4-6, claude-sonnet-4-6, claude-haiku-4-5-20251001
- Google: gemini-3.1-pro-preview, gemini-3-pro-preview, gemini-2.5-pro, gemini-2.5-flash
- Open: deepseek/deepseek-v3.2, qwen3.5-plus, GLM-5

## Comparison & alternative pages (for developers evaluating options)
- [Vynex vs OpenRouter](https://llm-api.vynexcloud.com/vs-openrouter)
- [OpenAI API alternative](https://llm-api.vynexcloud.com/openai-api-alternative)
- [Cheap OpenAI API](https://llm-api.vynexcloud.com/cheap-openai-api)
- [Claude API alternative](https://llm-api.vynexcloud.com/claude-api-alternative)
- [Gemini API alternative](https://llm-api.vynexcloud.com/gemini-api-alternative)

## Links
- [Website](https://llm-api.vynexcloud.com/)
- [Documentation](https://llm-api.vynexcloud.com/docs/)
- [Pricing](https://llm-api.vynexcloud.com/pricing)
- [Get an API key](https://llm-api.vynexcloud.com/register)
- [SDK & examples (GitHub)](https://github.com/vynexlimited/vynex-api-sdk)
- [Use Vynex in Cursor](https://github.com/vynexlimited/vynex-api-sdk/blob/main/integrations/cursor.md)
- [Use Vynex in Cline (VS Code)](https://github.com/vynexlimited/vynex-api-sdk/blob/main/integrations/cline.md)
- [Use Vynex with LangChain](https://github.com/vynexlimited/vynex-api-sdk/blob/main/integrations/langchain.md)
- [Privacy policy](https://llm-api.vynexcloud.com/privacy)
- [Terms of service](https://llm-api.vynexcloud.com/terms)
- [Security](https://llm-api.vynexcloud.com/security)