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

# Corti Models

> Frontier AI models on sovereign infrastructure, through an OpenAI-compatible API. Use them in your coding agent or call them directly.

Corti Models gives you frontier AI performance without giving up sovereignty, control, or speed. Corti takes the strongest available open-weight models and turns them into production-grade AI through tuning, inference optimization, and continuous improvement.

## Why Corti

* **Faster**: optimized for low latency (180 ms TTFT, 118.5 tokens/s on `corti-s1`)
* **Cheaper**: up to 50% lower cost than equivalent frontier models
* **Sovereign**: inference runs on Corti-managed infrastructure, never touching third-party cloud providers in the request path
* **Zero retention**: prompts and completions are never stored, never logged, and never used for training
* **Always frontier**: Corti continuously upgrades the underlying model behind each stable ID, so you always get the best available model without changing your code

For EU projects, inference runs entirely on Corti-managed European infrastructure with zero data retention. US projects are served by Azure-hosted OpenAI models under the same model IDs. See [Regions](/models/regions).

## Models

Corti S1 and S1 Mini are heavily optimized foundation models. Corti continuously selects the most capable model for each price tier and tunes it for quality and latency, so you always get the best available performance behind a stable model ID.

S1 is a product, not just a model. See [How Corti models work](/models/how-models-work) for what's behind the model IDs.

<CardGroup cols={2}>
  <Card title="Corti S1" icon="microchip" href="/models/models">
    * Based on GLM 5.2
    * Frontier quality (53 on <Tooltip tip="Artificial Analysis Intelligence Index, an independent benchmark evaluating reasoning, coding, math, and instruction following">AA Intelligence Index</Tooltip>)
    * Optimized for latency (180 ms <Tooltip tip="Time to first token, the delay before the model starts generating">TTFT</Tooltip> and 118.5 <Tooltip tip="Output tokens per second">tokens/s</Tooltip>)
  </Card>

  <Card title="Corti S1 Mini" icon="microchip" href="/models/models">
    * Based on Qwen 3.6
    * Efficient quality (31 on <Tooltip tip="Artificial Analysis Intelligence Index, an independent benchmark evaluating reasoning, coding, math, and instruction following">AA Intelligence Index</Tooltip>)
    * Supports image input
  </Card>
</CardGroup>

## Choose your path

<CardGroup cols={2}>
  <Card title="Use Corti Models in your coding agent" icon="terminal" href="/models/ai-coding-agent">
    Point OpenCode, Pi, Crush, or ForgeCode at Corti Models with the Corti CLI. No code changes.
  </Card>

  <Card title="Replace your LLM provider" icon="code" href="/models/quickstart">
    Swap your base URL and API key. Your existing OpenAI SDK code works unchanged.
  </Card>
</CardGroup>

## Sovereign deployment

Corti operates zero data retention: prompts and completions are never stored, never logged, and never used for training. For EU projects, inference runs on Corti-managed European infrastructure and data never leaves Europe. For US projects, the same model IDs are served by Azure-hosted OpenAI models. The platform can also be deployed in a dedicated environment or on customer-controlled infrastructure including on-premises. [Contact us](https://www.corti.ai/contact-us?products=corti-models,api\&use_case=I'd%20like%20to%20discuss%20sovereign%20or%20on-premises%20deployment%20of%20Corti%20Models.) to discuss deployment options.

## Next steps

<CardGroup cols={2}>
  <Card title="Models" icon="microchip" href="/models/models">
    Compare all four model variants by capability, reasoning, speed, and price.
  </Card>

  <Card title="How Corti models work" icon="book-open" href="/models/how-models-work">
    Learn how Corti turns open-weight models into production-grade AI.
  </Card>

  <Card title="Regions" icon="globe" href="/models/regions">
    See what's served where, and how to reach each region.
  </Card>

  <Card title="API Reference" icon="square-terminal" href="/api-reference/welcome">
    Browse the full Corti Models API with interactive examples.
  </Card>
</CardGroup>