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

# Supported Models

> Complete catalog of 40+ AI models available through ModelStack, grouped by provider.

## Overview

ModelStack provides access to models from three leading AI providers through a single API. All models use the OpenAI-compatible chat completions format.

<Note>
  Versioned model variants (e.g., `claude-sonnet-4-5-20250929`) are also supported. Any model with a supported prefix (`claude-`, `gpt-`, `o1-`, `o3-`, `o4-`, `gemini-`) is accepted.
</Note>

## Anthropic

| Model ID | Input / 1M tokens | Output / 1M tokens |
| - | - | - |
| `claude-opus-4-6` | \$5.00 | \$25.00 |
| `claude-opus-4-5` | \$5.00 | \$25.00 |
| `claude-opus-4-1` | \$15.00 | \$75.00 |
| `claude-sonnet-4-5` | \$3.00 | \$15.00 |
| `claude-sonnet-4-0` | \$3.00 | \$15.00 |
| `claude-opus-4` | \$15.00 | \$75.00 |
| `claude-haiku-4-5` | \$1.00 | \$5.00 |
| `claude-3-7-sonnet-20250219` | \$3.00 | \$15.00 |
| `claude-3-5-sonnet-20241022` | \$3.00 | \$15.00 |
| `claude-3-5-haiku-20241022` | \$0.80 | \$4.00 |
| `claude-3-haiku-20240307` | \$0.25 | \$1.25 |

**Versioned variants also supported:**
`claude-opus-4-5-20251101`, `claude-opus-4-1-20250805`, `claude-sonnet-4-5-20250929`, `claude-sonnet-4-20250514`, `claude-opus-4-20250514`, `claude-haiku-4-5-20251001`

## OpenAI

| Model ID | Input / 1M tokens | Output / 1M tokens |
| - | - | - |
| `gpt-4o` | \$2.50 | \$10.00 |
| `gpt-4o-mini` | \$0.15 | \$0.60 |
| `gpt-4-turbo` | \$10.00 | \$30.00 |
| `o1` | \$15.00 | \$60.00 |
| `o1-mini` | \$1.10 | \$4.40 |
| `o3` | \$10.00 | \$40.00 |
| `o3-mini` | \$1.10 | \$4.40 |
| `o4-mini` | \$1.10 | \$4.40 |

**Versioned variants also supported:**
`gpt-4o-2024-11-20`, `gpt-4o-mini-2024-07-18`

## Google

| Model ID | Input / 1M tokens | Output / 1M tokens |
| - | - | - |
| `gemini-2.5-pro` | \$1.25 | \$10.00 |
| `gemini-2.5-flash` | \$0.15 | \$0.60 |
| `gemini-2.0-flash` | \$0.10 | \$0.40 |
| `gemini-2.0-flash-lite` | \$0.075 | \$0.30 |
| `gemini-1.5-pro` | \$1.25 | \$5.00 |
| `gemini-1.5-flash` | \$0.075 | \$0.30 |

## Model Selection Guide

<CardGroup cols={2}>
  <Card title="Best Quality" icon="trophy">
    **`claude-opus-4-1`** or **`o1`** — Most capable models for complex reasoning, code generation, and nuanced tasks.
  </Card>

  <Card title="Best Balance" icon="scale-balanced">
    **`claude-sonnet-4-5`** or **`gpt-4o`** — Excellent quality at moderate cost. Great for production workloads.
  </Card>

  <Card title="Best Speed" icon="bolt">
    **`gemini-2.5-flash`** or **`gpt-4o-mini`** — Fast responses at low cost. Ideal for high-volume, latency-sensitive tasks.
  </Card>

  <Card title="Best Value" icon="coins">
    **`gemini-2.0-flash-lite`** or **`claude-3-haiku-20240307`** — Lowest cost per token for budget-conscious applications.
  </Card>
</CardGroup>


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