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

# Models

> The AI models available, grouped by capability tier and relative cost.

Agents and coding sessions can run on models from four providers — **Anthropic**, **OpenAI**, **Google**, and **Kimi**. Multi-model is available to all organizations with no special enrollment.

## Capability tiers

End users pick a *tier*, not a specific model — so prompts and agent configs stay portable when the model behind a tier changes.

<CardGroup cols={3}>
  <Card title="Smartest" icon="star">
    Deepest reasoning for complex, multi-step work.
  </Card>

  <Card title="Balanced" icon="bolt">
    The best everyday default — strong quality at moderate cost.
  </Card>

  <Card title="Fastest" icon="gauge">
    Quick and cheap for simple, high-volume tasks.
  </Card>
</CardGroup>

By default, each tier resolves to the Claude model in that slot — Opus 4.8 (Smartest), Sonnet 5 (Balanced), Haiku 4.5 (Fastest). Organizations can customize the different tiers of models for their end users.

## Model matrix

Each provider fills the same three tiers. The number next to each model is its **relative cost** — a multiple of Claude Opus 4.8 (`1×`), blended across input and output tokens (assuming a \~3:1 input-to-output mix), so every model sits on one scale. Figures are public list prices as of July 2026; actual billing is usage-based.

| Tier         | Anthropic                 | OpenAI                 | Google                          | Kimi                     |
| ------------ | ------------------------- | ---------------------- | ------------------------------- | ------------------------ |
| **Smartest** | Claude Opus 4.8 · `1×`    | GPT-5.5 · `1.1×`       | Gemini 3.5 Flash · `0.34×`      | —                        |
| **Balanced** | Claude Sonnet 5 · `0.6×`  | GPT-5.4 · `0.56×`      | Gemini 2.5 Flash · `0.09×`      | Kimi K2.7 Code · `0.17×` |
| **Fastest**  | Claude Haiku 4.5 · `0.2×` | GPT-5.4 mini · `0.17×` | Gemini 3.1 Flash-Lite · `0.06×` | Kimi K2.6 · `0.17×`      |

<Card title="Using models with agents" icon="robot" href="/agents/models">
  How a configured agent locks its chats to a single model.
</Card>