Is this Grok 4.20 Multi-Agent?

No. This page is locked to the standard x-ai/grok-4.20 route. The Multi-Agent version is a separate route and is not silently substituted here.

What is Grok 4.20 useful for?

It is useful for complex analysis, long specifications, and comparing multiple solution paths. In this Console, inputs still need to fit the site’s 100,000-character request limit.

Will the Console switch models if Grok 4.20 is unavailable?

No. The model is locked. If the exact route disappears from the live catalog, sending is disabled and the page reports that it is currently unavailable.

Is this an official xAI interface?

No. Grok Building is an independent developer interface using OpenRouter for model access. xAI and OpenRouter documentation remain the authoritative sources for model and route details.

xAI model / exact route

Use Grok 4.20 for complex analysis and long specifications

This page uses the standard x-ai/grok-4.20 route for complex analysis, long specifications, and solution comparison. It is not the separate Grok 4.20 Multi-Agent route.

Try Grok 4.20 View pricing

Search intent: Standard Grok 4.20 facts and an exact-model online console

01 / Model facts

Live route, not a frozen price card.

The provider directory supplies the mutable facts below. Official xAI documentation supplies model positioning; this page does not infer benchmark leadership.

Current route factsChecking directory

Model route: x-ai/grok-4.20
Provider context: 2M
Input / 1M: $1.25
Output / 1M: $2.50

Price, provider context, and availability are read from the site's current OpenRouter-backed model directory. They may change.

02 / Good fit

Choose the model for a concrete job.

Long-spec analysis

Extract requirements, conflicts, dependencies, and open questions from a large but deliberately selected specification.

Solution comparison

Evaluate several implementation paths against the same constraints and request a decision table with explicit assumptions.

Decomposed reasoning

Break a complex investigation into verifiable stages while keeping the reasoning inside one standard model conversation.

03 / Console limits

Model capability and site access are different.

This page calls standard Grok 4.20, not Grok 4.20 Multi-Agent. The two OpenRouter routes are distinct.
This Console sends text chat only. It does not expose file upload, Web or X Search, MCP, or tool execution.
A conversation is capped at 100,000 characters and a response at 4,096 tokens; the full provider context window is not exposed here.

04 / Online Console

Try Grok 4.20 on its exact route.

This selector is fixed to x-ai/grok-4.20. A stored preference cannot replace it.

Grok PlaygroundxAI models via OpenRouter

Cached catalog

xAI model

Grok 4.20 Fixed

Context

Input / 1M

2,500 cr

Output / 1M

5,000 cr

Free questions3 / 3

Credit balance0 cr

View pricing

Grok 4.20 ready

Ask about code, architecture, debugging, or the Grok Build source.

Ask three questions free as a guest. Sign in to keep your account balance, then add credits when advanced models become available.

Conversations stay private to this browser until you clear them.Three free questions. Credits unlock advanced models.

05 / Compare

Compare the current Grok routes.

Provider context is capacity, not a recommendation to send everything. Use the smallest relevant input and choose by task.

Model	Provider context	Input / 1M	Output / 1M	Route
Grok 4.5	500K	$2.00	$6.00	Cached
Grok 4.20	2M	$1.25	$2.50	Cached
Grok 4.3	1M	$1.25	$2.50	Cached

Grok Build model guide Credits and pricing

06 / FAQ

Grok 4.20 questions, answered precisely.

Sources & ownership

Independent interface, named sources.

Grok Building is an independent developer guide and interface. It is not an official xAI product. Model access on this site is provided through OpenRouter.

xAI model documentation
Official model-family documentation and published specifications.
OpenRouter xAI directory
Current standard and Multi-Agent routes, context, and token pricing.