flatkey is the most cost-efficient way to use AI models. One API key and one bill for Claude, GPT, Kimi, DeepSeek, GLM, Seedance and more — with most LLMs 20% off official pricing and the same quality as the official models, tested by 10,000+ customers. Drop-in: OpenAI-compatible API and SDK, the flatkey CLI, or plug straight into Codex and Claude Code. Text, image, video and audio models. SOC 2 data security.