# Grok 4.20

Grok 4.20 is a xAI language model released Mar 10, 2026; xAI's newest language model in our dataset is Grok 4.7. Proprietary, API access only. xAI's Grok 4.20 (grok-4.20-0309-reasoning), made available on Mar 10, 2026 alongside a Multi-agent variant. Verified against vendor sources on Oct 26, 2026.

Last verified: 2026-10-26 · Evidence: Reported · Canonical: https://theagenticweekly.com/models/grok-4-20 · JSON: https://theagenticweekly.com/api/models/grok-4-20

## Key facts

| Fact | Value | Source |
|---|---|---|
| Vendor | xAI |  |
| Released | Mar 10, 2026 | https://docs.x.ai/docs/release-notes |
| API id | `grok-4.20-0309-reasoning` | https://docs.x.ai/docs/models |
| Context window | 1,000,000 tokens (1M) | https://docs.x.ai/docs/models |
| Input | text, image | https://docs.x.ai/docs/models |
| Output | text | https://docs.x.ai/docs/models |
| Licence | Proprietary (API) | https://docs.x.ai/docs/models |
| Pricing | $1.25 in / $2.5 out per 1M tokens | https://docs.x.ai/docs/models |

## What we tested

Nothing yet. We have not run Grok 4.20 ourselves, so every fact here is Reported from the sources below.

## Sources

- [xAI release notes](https://docs.x.ai/docs/release-notes)
- [xAI models and pricing](https://docs.x.ai/docs/models)

Data licence: CC BY 4.0. Data: Agentic Weekly (https://theagenticweekly.com), CC BY 4.0.