# CometAPI > CometAPI is a unified API platform providing access to 500+ AI models from multiple providers. Use this index to find model information, current pricing, integration instructions, API references, and support. Use the model catalog for available models and their exact API model IDs. English model pages use `/models/{provider}/{model-id}/` on `https://www.cometapi.com`; follow actual catalog links instead of constructing URLs from display names. Model page slugs and API model IDs may differ. Use the API documentation for authentication, endpoint compatibility, request parameters, and response formats. Fetch current pricing from the pricing page and relevant model page; do not infer prices or capabilities from a model name. Documentation links below use Markdown where available. ## Main Entry Points - [CometAPI homepage](https://www.cometapi.com/): Platform overview, supported providers, and features. - [Model catalog](https://www.cometapi.com/models/): Browse available models, providers, capabilities, and model detail pages. - [Current pricing](https://www.cometapi.com/pricing/): Check current API rates and billing units before estimating costs. - [API documentation](https://apidoc.cometapi.com/): Developer documentation and API reference. - [Complete developer documentation index](https://apidoc.cometapi.com/llms.txt): Discover the full set of API references, model quickstarts, integration guides, and Markdown documentation pages. ## Model Detail Pages - [GPT-6 Astra](https://www.cometapi.com/models/openai/gpt-6-astra/): Model information and pricing; confirm the exact API model ID and supported request format before use. - [GPT Image 2.5](https://www.cometapi.com/models/openai/gpt-image-2-5/): Image model information, capabilities, and pricing. - [Gemini 4](https://www.cometapi.com/models/google/gemini-4/): Model information, capabilities, and pricing. ## Quick Start and Authentication - [Create an API key and make your first call](https://apidoc.cometapi.com/overview/quick-start.md): API key setup, authentication, base URL, and first-request examples. - [Account and billing setup](https://apidoc.cometapi.com/overview/important-guidelines.md): Account configuration, credit, API keys, and usage logs. - [Model API quickstarts](https://apidoc.cometapi.com/quickstarts/index.md): Find integration examples for text, image, and video models. - [OpenAI-compatible API example](https://apidoc.cometapi.com/quickstarts/text/openai-compatible-api.md): Send Chat Completions requests with cURL, Python, or Node.js. - [OpenAI SDK configuration](https://apidoc.cometapi.com/guides/use-cometapi-with-openai-sdk.md): Configure an OpenAI-compatible SDK with a CometAPI key and base URL. ## API Reference - [Chat Completions](https://apidoc.cometapi.com/api/text/chat.md): Request and response reference for chat completions. - [Responses API](https://apidoc.cometapi.com/api/text/responses.md): Request and response reference for model responses; check model-specific support. - [Claude Messages](https://apidoc.cometapi.com/api/text/anthropic-messages.md): Anthropic-compatible Messages request format. - [Gemini content generation](https://apidoc.cometapi.com/api/text/gemini-generating-content.md): Native Gemini request format. - [Image APIs](https://apidoc.cometapi.com/api/image/index.md): Select an image generation or editing API. - [Video APIs](https://apidoc.cometapi.com/api/video/index.md): Select a video generation API and its task workflow. ## Errors, Limits, and Cost - [Error handling and retries](https://apidoc.cometapi.com/guides/error-codes-and-retry-strategy.md): Diagnose request, authentication, rate-limit, and platform errors before retrying. - [Error code reference](https://apidoc.cometapi.com/errors/error-codes-handling.md): Look up error codes and corrective steps. - [Rate limits and concurrency](https://apidoc.cometapi.com/guides/rate-limits-and-concurrency.md): Manage request concurrency and rate-limit responses. - [Estimate request cost](https://apidoc.cometapi.com/guides/how-to-estimate-cost-before-calling-a-model.md): Estimate costs using current pricing and expected request size. ## Updates and Support - [Blog](https://www.cometapi.com/blog/): Model announcements, integration guides, and articles. - [Changelog](https://www.cometapi.com/changelog/): Platform and model updates. - [Help Center](https://apidoc.cometapi.com/support/help-center.md): Technical support information and operational guidance. - [Email support](mailto:support@cometapi.com): Technical assistance, integration questions, and billing support. - [Discord community](https://discord.com/invite/HMpuV6FCrG): Community questions, announcements, and team discussions. ## Optional - [GitHub organization](https://github.com/CometAPI-dev): SDKs, examples, and integration resources. - [X account](https://x.com/cometapi2025): Product announcements and updates. - [VK page](https://vk.com/cometapi): Russian-language announcements and updates. - [Vietnamese homepage](https://www.cometapi.com/vi/): Vietnamese-language website. - [Turkish homepage](https://www.cometapi.com/tr/): Turkish-language website. - [German homepage](https://www.cometapi.com/de/): German-language website. - [Korean homepage](https://www.cometapi.com/ko/): Korean-language website. - [Russian homepage](https://www.cometapi.com/ru/): Russian-language website.