How much does Grok 4.20 cost?

Grok 4.20 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?

Grok 4.20 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 open source?

We list Grok 4.20 as closed: it is used through its maker's apps or API and its weights are not published (Epoch AI lists its access as "API access").

How good is Grok 4.20 compared with other AI models?

On the Epoch Capabilities Index, Grok 4.20 scores 152.1 (likely range 149.6 to 154.5), which ranks 50 of 270 models we track. Scores close together are a tie in practice.

How does Grok 4.20 compare with Muse Spark?

Grok 4.20 scores higher on 1 of 3 shared quality measures, Muse Spark on 0. 2 measures are too close to call. See the full comparison for every measure.

How current are these numbers for Grok 4.20?

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: Score, Price and Context Window

Where Grok 4.20 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
Released Feb 2026

Its score range overlaps with Claude Sonnet 4.6, the model just above it, so a small gap in rank is not a meaningful difference.

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

Overall score: 152.1; Rank 50 of 270. Likely range 149.6 to 154.5.
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 (Epoch AI: API access).

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

We do not have an Arena human-vote rating for Grok 4.20 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 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 compared with all models we trackOverall capability: 152.1. Better than 81% of the other 269 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.

Overall capability152.1
Better than 81% of the other 269 modelsTop 25%
Epoch Capabilities Index: one score that combines many tests.
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 ranks

Leaderboards it appears on, best placing first.

See all leaderboards

Test results

Each test checks one kind of skill. Place shows where it stands among the models that took that test.

GPQA Diamond
Very hard multiple-choice science questions in biology, physics and chemistry, written by experts and designed so a quick web search does not give the answer.
89.3%
Place 47 of 183
ARC-AGI-2
Visual puzzles where the AI must work out a new rule from a few examples and apply it. They test picking up a new idea quickly, not recalling facts.
65.1%
Place 25 of 86
OTIS Mock AIME
Maths competition problems in the style of the US AIME exam, from the 2024 and 2025 sets. Every answer is a whole number.
92.2%
Place 51 of 174
FrontierMath (Tiers 1-3)
Original, very hard maths problems written by mathematicians. Each has an exact answer and the problems are kept private so models cannot have memorised them. This is the Tiers 1 to 3 set, version 2.
44.9%
Place 56 of 87
tied with 1 other
SimpleQA Verified
Short factual questions that each have one correct answer. It measures how often a model gets facts right.
30.2%
Place 63 of 82

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.

Similar models

Models from other makers with a similar overall score.

Learn more

Questions about Grok 4.20

How much does Grok 4.20 cost?: Grok 4.20 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?: Grok 4.20 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 open source?: We list Grok 4.20 as closed: it is used through its maker's apps or API and its weights are not published (Epoch AI lists its access as "API access").
How good is Grok 4.20 compared with other AI models?: On the Epoch Capabilities Index, Grok 4.20 scores 152.1 (likely range 149.6 to 154.5), which ranks 50 of 270 models we track. Scores close together are a tie in practice.
How does Grok 4.20 compare with Muse Spark?: Grok 4.20 scores higher on 1 of 3 shared quality measures, Muse Spark on 0. 2 measures are too close to call. See the full comparison for every measure.
How current are these numbers for Grok 4.20?: 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

Epoch AI: Benchmark data: Epoch AI, 'Capabilities & benchmarking', epoch.ai/benchmarks (CC BY 4.0). We match models across sources, rank them and show them in charts. Scores are not changed. Epoch AI 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