---
title: Anthropic & OpenAI
description: Configuring Anthropic Claude and OpenAI models in NIKI.
sidebar:
  order: 2
  label: Anthropic & OpenAI
---

## Anthropic & OpenAI Setup

Anthropic and OpenAI provide the foundational high-reasoning models for NIKI.

---

## Anthropic Configuration

Set your environment variable:

```bash
export ANTHROPIC_API_KEY="sk-ant-api03-..."
```

Or configure in `niki.toml`:

```toml
[providers.anthropic]
api_key       = "sk-ant-..."
default_model = "claude-sonnet-4-20250514"
```

---

## OpenAI Configuration

Set your environment variable:

```bash
export OPENAI_API_KEY="sk-proj-..."
```

Or configure in `niki.toml`:

```toml
[providers.openai]
api_key       = "sk-..."
default_model = "gpt-4o"
```