# Grok 4.20 Multi-Agent (0309)

> A multi-agent Grok 4.20 snapshot designed for coordinated reasoning across multiple agents.

Agent resources: the index of everything machine-readable is https://www.ohmygpt.com/llms.txt; the integration skill (endpoints, auth, SDK and coding-tool setup) is https://www.ohmygpt.com/skill.md.

- Model ID: `xai/grok-4.20-multi-agent-0309`
- Live status and providers as JSON, no key needed: https://api.ohmygpt.com/v1/models/xai/grok-4.20-multi-agent-0309
- Released: 2026-03-09
- Context: 2M tokens
- Max output: 128K tokens
- Input: text, image; output: text
- Human preference rating (LMArena text): 1451

## Prices (USD)

| Item | Price | Unit |
| --- | --- | --- |
| Input | $1.375 | per 1M tokens |
| Output | $2.75 | per 1M tokens |
| Cache read | $0.22 | per 1M tokens |
| Reasoning output | $2.75 | per 1M tokens |
| Web search | $0.0055 | per request |

## Providers

Without a prefix each request goes to the best-priced healthy provider. To pin one, send the model as `<provider>:xai/grok-4.20-multi-agent-0309`.

| Provider | Pinned model ID | Location | Input | Output | Trains on your data |
| --- | --- | --- | --- | --- | --- |
| xAI | `xai:xai/grok-4.20-multi-agent-0309` | United States | $1.375 | $2.75 | no |

## Endpoints

| API | Request | model |
| --- | --- | --- |
| OpenAI Chat | POST https://api.ohmygpt.com/v1/chat/completions | `xai/grok-4.20-multi-agent-0309` |
| OpenAI Responses | POST https://api.ohmygpt.com/v1/responses | `xai/grok-4.20-multi-agent-0309` |
| Anthropic Messages | POST https://api.ohmygpt.com/v1/messages | `xai/grok-4.20-multi-agent-0309` |
| Google Gemini | POST https://api.ohmygpt.com/v1/models/xai/grok-4.20-multi-agent-0309:generateContent | `xai/grok-4.20-multi-agent-0309` |

## Example

```bash
curl https://api.ohmygpt.com/v1/responses \
  -H "Authorization: Bearer $OHMYGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "xai/grok-4.20-multi-agent-0309",
    "input": "Hello"
  }'
```

Web page: https://www.ohmygpt.com/models/xai/grok-4.20-multi-agent-0309