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

# Supported Models

> Available coding CLIs and LLM providers

## Supported coding agents

Twill orchestrates existing CLI coding agents rather than building its own. This lets you use each model in a toolchain it’s designed to work well with.

| CLI             | Description                                          | Status    |
| --------------- | ---------------------------------------------------- | --------- |
| **Claude Code** | Anthropic's official CLI for Claude                  | Available |
| **OpenCode**    | Open-source coding agent with multi-provider support | Available |
| **Codex**       | OpenAI's coding CLI                                  | Available |

## Supported LLMs

### Claude Code

| Model         | Description                                                      |
| ------------- | ---------------------------------------------------------------- |
| Claude Fable  | Anthropic's most intelligent model (Fable 5)                     |
| Claude Opus   | Most capable Opus, best for complex tasks (defaults to Opus 4.7) |
| Claude Sonnet | Balanced performance and speed                                   |
| Claude Haiku  | Fastest, best for simple tasks                                   |

### OpenCode

OpenCode supports multiple model providers:

| Model             | Provider  |
| ----------------- | --------- |
| DeepSeek V4 Pro   | DeepSeek  |
| GLM 5.1           | Z.ai      |
| Kimi K2.6         | Moonshot  |
| Claude 4.7 Opus   | Anthropic |
| Claude 4.6 Sonnet | Anthropic |
| GPT 5.5           | OpenAI    |
| GPT 5.4           | OpenAI    |
| GPT 5.3 Codex     | OpenAI    |
| Gemini 3.1 Pro    | Google    |

### Codex

| Model         | Model ID        | Description              |
| ------------- | --------------- | ------------------------ |
| GPT 5.5       | `gpt-5.5`       | OpenAI GPT 5.5           |
| GPT 5.4       | `gpt-5.4`       | OpenAI GPT 5.4           |
| GPT 5.3 Codex | `gpt-5.3-codex` | Coding-optimized GPT 5.3 |