# NextChat Setup Guide for OfoxAI

Source: https://ofox.ai/docs/integrations/nextchat

[NextChat](https://nextchat.dev) (formerly ChatGPT-Next-Web) is a popular open-source AI client supporting Web, desktop (macOS, Windows, Linux) deployment, with a clean interface and support for multiple AI providers.

By configuring OfoxAI as your provider, you can use GPT, Claude, Gemini, and 100+ models in NextChat with a single API Key.

NextChat supports three protocols with OfoxAI:

| Protocol | Provider | Endpoint | Supported Models |
|----------|----------|----------|-----------------|
| **OpenAI Chat** | OpenAI | `https://api.ofox.ai` | All models (with `provider/` prefix) |
| **Anthropic** | Anthropic | `https://api.ofox.ai/anthropic` | Claude series |
| **Google Gemini** | Google | `https://api.ofox.ai/gemini` | Gemini series |

## Prerequisites

- An OfoxAI account with an API Key ([Get one here](https://app.ofox.ai))
- NextChat installed ([Download](https://nextchat.dev)) or use the web version

## Setup Steps

### Step 1: Open Settings

Launch NextChat and click the **Settings** icon in the bottom left.

![Open NextChat Settings](https://ofox.ai/screenshots/nextchat/01-home.png)

### Step 2: Configure Model Provider and API Key

In the settings page, find the **Model Provider** dropdown, select the corresponding provider, and fill in the API endpoint and API Key.

Fill in the configuration based on your chosen provider:

**OpenAI (supports all models)**

| Field | Value |
|-------|-------|
| **Model Provider** | OpenAI |
| **API Endpoint** | `https://api.ofox.ai` |
| **API Key** | Your OfoxAI API Key |
| **Custom Model Names** | e.g. `openai/gpt-6.1-sol,anthropic/claude-sonnet-5.5,deepseek/deepseek-v4.1-flash` |

**Anthropic (Claude series)**

| Field | Value |
|-------|-------|
| **Model Provider** | Anthropic |
| **API Endpoint** | `https://api.ofox.ai/anthropic` |
| **API Key** | Your OfoxAI API Key |
| **Custom Model Names** | e.g. `claude-sonnet-5.5,claude-opus-5.5,claude-haiku-5.5` |

**Google (Gemini series)**

| Field | Value |
|-------|-------|
| **Model Provider** | Google |
| **API Endpoint** | `https://api.ofox.ai/gemini` |
| **API Key** | Your OfoxAI API Key |
| **Custom Model Names** | e.g. `google/gemini-3.8-flash,google/gemini-3.5-flash-lite` |

![Configure Model Provider and API Key](https://ofox.ai/screenshots/nextchat/02-settings.png)

The **Custom Model Names** field supports multiple models separated by commas. These models will appear in the **Model** dropdown for selection.

When using the OpenAI provider, set the API Endpoint to `https://api.ofox.ai` (without `/v1`). NextChat appends the path automatically. Using `https://api.ofox.ai/v1` will cause a duplicate path error.

### Step 3: Select a Model

After configuration, in the **Model** dropdown at the bottom of the settings page, you can see the custom models you just entered.

![Select model after configuration](https://ofox.ai/screenshots/nextchat/03-openai-config.png)

Click the dropdown to see all available providers and models.

![Model list](https://ofox.ai/screenshots/nextchat/04-provider-list.png)

## Start Using

Close settings and go back to the main screen. Select your model and start chatting.

![Start chatting](https://ofox.ai/screenshots/nextchat/05-start-chat.png)

## Available Model Examples

For recommended models, see the [OfoxAI Model Marketplace](https://ofox.ai/models).

## Troubleshooting

**Q: Error `No providers support endpoint 'chat_completions'`**

The model name is incorrect or your account doesn't have access to that model. Check the model name or try a different one.

**Q: Error `Unsupported OpenAI API endpoint`**

The API Endpoint is set to `https://api.ofox.ai/v1`, causing a duplicate path. Change it to `https://api.ofox.ai` (without `/v1`).

**Q: Can the OpenAI provider call Claude and Gemini models?**

Yes. When using the OpenAI provider, enter the full model name with provider prefix in Custom Model Names (e.g. `anthropic/claude-sonnet-5.5`), and OfoxAI will route to the correct provider.

**Q: Do Anthropic and Google provider model names need a prefix?**

For Anthropic, enter just `claude-sonnet-5.5` (no prefix). For Google, enter `google/gemini-3.8-flash` (with `google/` prefix).