> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apiany.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Chat models

> Text generation and multimodal chat model behavior.

Chat models can be exposed through:

* `/v1/chat/completions`
* `/v1/messages`
* `/v1beta/models/{model}:generateContent`

Pricing can include:

* Input tokens.
* Output tokens.
* Cached input tokens.
* Minimum request credits.

Context window and maximum output limits are model-level capability metadata.

## Available models

| Model ID                | Description                                                                                                                |
| ----------------------- | -------------------------------------------------------------------------------------------------------------------------- |
| `gpt-5.5`               | OpenAI GPT-5.5 — flagship model for advanced reasoning, coding, and complex multi-step instructions.                       |
| `gpt-5.4`               | OpenAI GPT-5.4 — high-capability model for advanced reasoning, coding, and agentic workflows.                              |
| `gpt-5.4-mini`          | OpenAI GPT-5.4 mini — balanced speed, quality, and cost for high-volume production use.                                    |
| `gpt-5.4-nano`          | OpenAI GPT-5.4 nano — the fastest, lowest-cost GPT-5.4 tier for simple, high-throughput tasks.                             |
| `gpt-4o-mini`           | OpenAI GPT-4o mini — fast, affordable multimodal model for everyday chat and lightweight tasks.                            |
| `claude-opus-4-8`       | Anthropic Claude Opus 4.8 — frontier model for the most demanding reasoning, coding, and long-form work.                   |
| `claude-sonnet-4-6`     | Anthropic Claude Sonnet 4.6 — a balanced frontier model delivering strong reasoning at production speed and cost.          |
| `gemini-3.1-pro`        | Google Gemini 3.1 Pro — top-tier multimodal model for complex reasoning, long context, and demanding production workloads. |
| `gemini-3.5-flash`      | Google Gemini 3.5 Flash — fast, cost-efficient multimodal model with strong reasoning and a large context window.          |
| `gemini-3.1-flash-lite` | Google Gemini 3.1 Flash Lite — fast, economical model with improved reasoning over the 2.5 generation.                     |
| `gemini-2.5-flash-lite` | Google Gemini 2.5 Flash Lite — ultra-low-cost, low-latency model for high-volume everyday tasks.                           |
| `deepseek-v4`           | DeepSeek V4 — strong reasoning and coding performance at a highly competitive price.                                       |
| `deepseek-v4-flash`     | DeepSeek V4 Flash — a latency-optimized DeepSeek V4 variant for high-volume, low-cost inference.                           |
| `glm-5.1`               | Zhipu GLM-5.1 — a capable bilingual (Chinese/English) model for reasoning, coding, and agent applications.                 |
| `minimax-m3`            | MiniMax M3 — a capable large language model for long-context reasoning, tool use, and multilingual chat.                   |