LLMFly AI - One API for GPT, Claude, Gemini & Grok

# LLMFly AI > LLMFly AI is a bilingual AI API gateway and developer resource. It provides one OpenAI-compatible API, one API key, and one account balance for supported language, reasoning, coding, and multimodal models. English is the default language on the main site and in the documentation center. Simplified Chinese pages use the `/zh/` prefix, including `/doc/zh/` for documentation. Product availability, model IDs, capabilities, and prices can change; verify current information in the product interface before making production decisions. ## Product - [LLMFly AI home](https://llmfly.ai/): English product overview and primary navigation. - [LLMFly AI 中文首页](https://llmfly.ai/zh/): Simplified Chinese product overview and primary navigation. - [Model catalog](https://llmfly.ai/models/): Browse supported providers, model families, capabilities, and model-selection guidance. - [模型目录](https://llmfly.ai/zh/models/): 中文模型、提供商、能力与选型指南。 - [API pricing](https://llmfly.ai/pricing/): Guidance for comparing model rates and validating actual usage costs. - [API 价格](https://llmfly.ai/zh/pricing/): 中文模型费率与实际用量核对指南。 - [Model comparison tool](https://llmfly.ai/compare/): Select two models and compare capabilities, prices, and estimated task costs side by side. - [Use cases](https://llmfly.ai/use-cases/): Production patterns for coding, chatbots, agents, documents, and reasoning workloads. ## Documentation - [LLMFly API integration skill](https://llmfly.ai/skills/llmfly-api/SKILL.md): Agent-ready instructions for API setup, authentication, model selection, client configuration, verification, and troubleshooting. - [English documentation](https://llmfly.ai/doc/): Complete English documentation for account setup, API access, supported clients, images, errors, and FAQs. - [中文文档中心](https://llmfly.ai/doc/zh/): Complete Simplified Chinese documentation for account setup, API access, sup