How much does Grok 4.20 Beta (0309) cost?

Grok 4.20 Beta (0309) costs $1.25 per million input tokens and $2.50 per million output tokens, using the list price from xAI as of 26 Oct 2026. That is about $0.25 for 100 chats of about 1,000 tokens in and 500 tokens back. Confirm on the maker's site before you buy, because prices change.

What is the context window of Grok 4.20 Beta (0309)?

Grok 4.20 Beta (0309) has a context window of 1M tokens, roughly 750,000 words of text read at once. A single answer can be up to 1M tokens long.

Is Grok 4.20 Beta (0309) open source?

We list Grok 4.20 Beta (0309) as closed: it is used through its maker's apps or API and its weights are not published.

How current are these numbers for Grok 4.20 Beta (0309)?

The newest data on this page is dated 26 Oct 2026. Scores come from Epoch AI and Arena, prices from the open LiteLLM price list.

AI Rankings

Grok 4.20 Beta (0309): Score, Price and Context Window

Where Grok 4.20 Beta (0309) from xAI ranks, what it costs and how much text it can read, in plain numbers with the sources.

Data updated 26 Oct 2026

xAI
Closed weights

Best for

Very long documents: its context window is 1M tokens, roughly 750,000 words.

These lines are worked out from the numbers on this page, not from hands-on testing.

Key facts

Human preference: chat: 1472; Rank 40 of 166. 66,418 votes, at the "Reasoning" setting.
Human preference: coding: 1511; Rank 49 of 166. 18,360 votes, at the "Reasoning" setting.
Human preference: web pages: 1376; Rank 75 of 85. 15,469 votes, at the "Reasoning" setting.
Human preference: images: 1255; Rank 40 of 85. 26,796 votes, at the "Reasoning" setting.
Price per million tokens: $1.25 in / $2.50 out; Blended $1.56. Cached input $0.20. List price from xAI, checked 26 Oct 2026.
Context window: 1M tokens; About 750,000 words at once. One answer up to 1M tokens.
Weights: Closed; Used through the maker's apps or API.

Features listed by the price list: Image input, Tool use, Reasoning, Web search, Prompt caching, Structured output.

We do not have an Epoch Capabilities Index score and benchmark results for Grok 4.20 Beta (0309) yet. It is shown as "Not measured" rather than guessed.

Try itGrok in our AI tools directoryConversational AI assistant for writing, coding, visual creation, and live information from the web and X.

How Grok 4.20 Beta (0309) stacks up

Each strip shows every model we track as faint bars. The dot is this model. Better is always to the right, even for price.

Grok 4.20 Beta (0309) compared with all models we trackHuman preference: chat: 1472. Better than 76% of the other 165 models. Human preference: coding: 1511. Better than 70% of the other 165 models. Human preference: web pages: 1376. Better than 11% of the other 84 models. Human preference: images: 1255. Better than 53% of the other 84 models. Price: $1.56 per 1M. Cheaper than 43% of the other 200 priced models. Context window: 1M tokens. Larger context window than 72% of the other 198 models.

Human preference: chat1472
Better than 76% of the other 165 modelsTop 25%
How often people pick its answers over another model's on Arena.
Human preference: coding1511
Better than 70% of the other 165 modelsUpper half
How often people pick its answers to coding questions on Arena.
Human preference: web pages1376
Better than 11% of the other 84 models
How often people pick the web pages and small apps it builds on Arena.
Human preference: images1255
Better than 53% of the other 84 modelsUpper half
How often people pick its answers about pictures on Arena.
Price$1.56 per 1M
Cheaper than 43% of the other 200 priced models
Blended price per million tokens. Lower is better, so the cheapest models sit on the right.
Context window1M tokens
Larger context window than 72% of the other 198 modelsUpper half
How much text it can read at once. Bigger suits long documents.

Compared with the other published models that have each measure. Data updated 26 Oct 2026.

Where Grok 4.20 Beta (0309) ranks

Leaderboards it appears on, best placing first.

See all leaderboards

What it costs in everyday terms

List prices turned into amounts you can picture. Real bills depend on how you use it.

100 chats: $0.25; Cost of 100 chats assumes each chat sends 1,000 tokens (about 750 words) and gets 500 tokens (about 375 words) back.
A 300-page book: $0.13; Cost to read a 300-page book assumes about 100,000 input tokens and no reply. A real book varies with page size and language.
Blended price: $1.56 per 1M; Three parts input to one part output. Our own calculation for comparing models.

Learn more

Questions about Grok 4.20 Beta (0309)

How much does Grok 4.20 Beta (0309) cost?: Grok 4.20 Beta (0309) costs $1.25 per million input tokens and $2.50 per million output tokens, using the list price from xAI as of 26 Oct 2026. That is about $0.25 for 100 chats of about 1,000 tokens in and 500 tokens back. Confirm on the maker's site before you buy, because prices change.
What is the context window of Grok 4.20 Beta (0309)?: Grok 4.20 Beta (0309) has a context window of 1M tokens, roughly 750,000 words of text read at once. A single answer can be up to 1M tokens long.
Is Grok 4.20 Beta (0309) open source?: We list Grok 4.20 Beta (0309) as closed: it is used through its maker's apps or API and its weights are not published.
How current are these numbers for Grok 4.20 Beta (0309)?: The newest data on this page is dated 26 Oct 2026. Scores come from Epoch AI and Arena, prices from the open LiteLLM price list.

Where this data comes from

Arena (formerly LMArena): Human-preference ratings: Arena (arena.ai) leaderboard dataset, CC BY 4.0. We keep the latest published ratings, match them to models from other sources and rank them. Ratings are not changed. Arena does not endorse this site.
LiteLLM model price list: Prices and context windows: LiteLLM model price list (github.com/BerriAI/litellm, MIT licence). We use the model maker's own price entry when there is one. Prices change often, so always confirm on the maker's site before you buy.

Newest data on this page: 26 Oct 2026. Prices are list prices and change often, so confirm on the maker's site before you buy. Sponsors never change a score or an order. How we calculate this · Report a mistake