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Grok 4.20

Release Ruler for Grok 4.20: released Mar 10, 2026, $1.25 per 1M input tokens, proprietary. Each thin stem on the ruler is another model we track.

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.

Reported Last verified · All models · JSON · Markdown

  • ReleasedMar 10, 2026
  • Context window1M1,000,000 tokens
  • LicenceProprietaryProprietary (API)
InTextImageOutText

Key facts

Grok 4.20: key facts with sources
FactValueSource
VendorxAIn/a
ReleasedMar 10, 2026source
Statusgenerally availablen/a
API idgrok-4.20-0309-reasoningsource
Context window1,000,000 tokens (1M)source
Inputtext, imagesource
Outputtextsource
LicenceProprietary (API)source
Pricing$1.25 in / $2.5 out per 1M tokenssource

Where Grok 4.20 sits in our data

How Grok 4.20 differs from Grok 4.5

Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.

  • Listed price is $1.25 in and $2.5 out, against $2 in and $6 out for Grok 4.5 (per 1M tokens).
  • Context window is 1M tokens against 500K for Grok 4.5.
  • Both accept text, image as input.
  • Grok 4.20 came out 120 days before Grok 4.5.
  • Facts for the other model: Grok 4.5.

What we tested

Nothing yet. We have not run Grok 4.20 ourselves, so every fact on this page is Reported from the sources below. When we do test it, the scope will be stated here and in our test logs. See methodology.

Sources

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