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

# Models

> Choose which LLM powers your chat, understand cost multipliers, and optionally bring your own API key

## Overview

Zencoder has a model selector in the chat input. Use the dropdown to pick which LLM runs your messages. The options you see depend on your plan and entitlements.

* Model choices may differ by plan; higher plans unlock additional models
* Select the model that fits your task from the selector

Zencoder supports models from OpenAI, Anthropic, Google, and xAI.

## Available models (subject to change)

The Auto model routes across a tuned mix of self-hosted and vendor models for the best balance of speed, quality, and cost.

<img src="https://mintcdn.com/forgoodaiinc/sNjMlhACN-8o-oMy/images/model-selector-nov25.png?fit=max&auto=format&n=sNjMlhACN-8o-oMy&q=85&s=7bebd70116a239d08eb778dfbf4ae68e" alt="Model selector showing available models and multipliers" width="1114" height="944" data-path="images/model-selector-nov25.png" />

| Model            | Provider  | Multiplier | Plan Requirements      |
| :--------------- | :-------- | ---------: | :--------------------- |
| Auto             | Zencoder  |         1× | All plans              |
| Auto+            | Zencoder  |       2.5× | All plans              |
| Haiku 4.5        | Anthropic |         1× | Pro, Pro Plus, Pro Max |
| Sonnet 4.6       | Anthropic |         3× | Pro, Pro Plus, Pro Max |
| Opus 4.6         | Anthropic |         5× | Pro Plus, Pro Max      |
| Opus 4.7         | Anthropic |         5× | Pro Plus, Pro Max      |
| Gemini Pro 3.1   | Google    |         2× | All plans              |
| Gemini Flash 3.0 | Google    |         1× | All plans              |
| GPT-5.3 Codex    | OpenAI    |         2× | Pro, Pro Plus, Pro Max |
| GPT-5.4          | OpenAI    |       2.5× | Pro, Pro Plus, Pro Max |
| GPT-5.5          | OpenAI    |         5× | Pro Plus, Pro Max      |
| GPT-5.4-mini     | OpenAI    |      1.25× | Pro, Pro Plus, Pro Max |
| Grok Code Fast 1 | xAI       |      0.25× | All plans              |

Lowest multipliers: Grok Code Fast 1 (0.25×), Auto (1×). All multipliers and model availability are subject to change.

Model availability evolves over time. We may add, remove, or upgrade models without notice as providers change capabilities and pricing. Your selector will always reflect the currently supported set for your plan.

## Cost multipliers and credits

Zencoder measures usage in credits. Some models use a multiplier to reflect provider costs or parallel reasoning. See the table above and the screenshot for current multipliers.

<Tip>
  Example: If a response would normally consume 10 credits, running it with Opus 4.7 (5×) would count as 50 credits. For details about credit consumption and accounting, see the [Credit Usage Reference](/faq/pricing#credit-usage-reference) table in <a href="/faq/pricing">Pricing & Plans</a>.
</Tip>

## Plan-based availability

Not all plans have access to all models. The selector shows what your current plan can use. If you recently upgraded but don’t see expected options, restart your IDE to refresh entitlements.

* **Pro, Pro Plus, and Pro Max plans**: Full model selector with all available models
* **Free plan**: Access to Auto, Gemini Flash 3.0, and Grok Code Fast 1

## Bring Your Own Key (BYOK)

You can use your own API key for certain providers. This is useful if you:

* Want to bypass credit consumption for those requests
* Prefer billing directly with the provider

Supported providers in the UI today: Anthropic and OpenAI.

<Info>
  BYOK is currently available on all plans, including Free, Pro, Pro Plus, Pro Max, and Enterprise.
</Info>

### Enable BYOK

<Steps>
  <Step title="Open Zencoder menu">
    Click the Zencoder icon in your IDE, then click the ⋯ (three dots) menu.
  </Step>

  <Step title="Choose User API key">
    Select <code>User API key</code> from the dropdown to open <code>Custom API keys</code>.
  </Step>

  <Step title="Enter keys and use">
    Paste your Anthropic or OpenAI key, save, then pick a matching provider model in the model selector.

    <img src="https://mintcdn.com/forgoodaiinc/K9DwmHqJDSAPSbZr/images/models-byok.png?fit=max&auto=format&n=K9DwmHqJDSAPSbZr&q=85&s=7aa2405065bf8160d7c69ad972caaa5a" alt="Custom API keys screen with Anthropic and OpenAI fields" width="1076" height="908" data-path="images/models-byok.png" />
  </Step>
</Steps>

<Tip>
  When BYOK is active for a given provider/model, those requests do not consume Zencoder credits — usage and billing are governed by your provider account. Make sure you understand the provider's pricing before enabling heavy workloads.
</Tip>

<Warning>
  Keep your keys secure. Only paste keys into the official Zencoder UI. If you rotate/regenerate keys at the provider, update them in Zencoder as well.
</Warning>

## When to switch models

* Use the <strong>Auto</strong> model for most coding tasks - it balances speed, quality, and cost
* Use the <strong>Auto+</strong> for superior performance on complex tasks (2.5× multiplier)
* Use <strong>Haiku 4.5</strong> for a fast and cost-efficient option (1× multiplier)
* Use <strong>Grok Code Fast 1</strong> when you need the most cost-efficient option (0.25× multiplier)
* Use <strong>GPT-5.4-mini</strong> for cost-efficient code generation (1.25× multiplier)
* Use <strong>Gemini Pro 3.1</strong> for high-quality performance with balanced capability (2× multiplier)
* Use <strong>Sonnet 4.6</strong> for spec-driven development tasks requiring persistent state tracking and parallel execution
* Use <strong>GPT-5.5</strong> for specialized code generation tasks (Pro Plus and Pro Max plans, 5× multiplier)
* Use <strong>Opus 4.6</strong> for challenging tasks requiring high capability (Pro Plus and Pro Max plans, 5× multiplier)
* Use <strong>Opus 4.7</strong> (Pro Plus and Pro Max plans) for the most complex reasoning tasks, keeping the 5× multiplier in mind

<Note>
  Heavier reasoning models may produce better results on difficult tasks but at higher credit consumption. Keep separate chats for different experiments to maintain clarity.
</Note>

## Troubleshooting

<AccordionGroup>
  <Accordion title="I don't see the model selector">
    Make sure you’re on the new plans. Sign out/in to refresh entitlements.
  </Accordion>

  <Accordion title="My plan changed but the model list didn't update">
    Restart your IDE after signing back in.
  </Accordion>

  <Accordion title="BYOK isn't being used">
    Confirm you selected a model that matches the provider whose key you added, and that the key is valid/active.
  </Accordion>
</AccordionGroup>

## Related

<CardGroup cols={2}>
  <Card title="Pricing & Plans" icon="badge-dollar" href="/faq/pricing">
    Learn how credits and usage-based billing work
  </Card>

  <Card title="Coding Agent" icon="code" href="/features/coding-agent">
    See how models are applied in the full agentic workflow
  </Card>
</CardGroup>