When was Grok 4.20 released, and is it still maintained?

Grok 4.20 was released on 2026-03-09. Its catalog status is stable. Check the model page for deprecation notices before you build a long-lived integration on it.

What is the rate limit for Grok 4.20?

The current model record does not publish a numeric rate limit for Grok 4.20. Confirm the quota for your plan in the console, then run a short load test at your expected concurrency to establish the effective ceiling before production.

How does Grok 4.20 compare with grok-4-20-reasoning, and what should you compare?

Grok 4.20 sits alongside grok-4-20-reasoning , grok-4.2 , grok-4.20-beta-0309-reasoning in the catalog. Compare them on the dimensions that change your bill and your users’ experience: task quality on your own prompts, latency at your concurrency, context and output limits, and cost per completed task rather than per token.

Can you call Grok 4.20 with the OpenAI SDK you already use?

Yes. Grok 4.20 is reachable through an OpenAI-compatible endpoint, so an existing OpenAI SDK client works after pointing the base URL at MixRoute and setting the model parameter to grok-4.20-0309-reasoning . Keep your current request and response handling.

Can you control the reasoning budget on Grok 4.20?

Grok 4.20 is a reasoning model. Reasoning effort can be tuned per request. Lower effort settings cut reasoning tokens and cost for routine work; reserve higher settings for problems that need deeper search. Measure quality at two or three settings before fixing one in production.

Model detail

Grok 4.20 Reasoning 0309

Provided by xAI

Pay-as-you-go

A Grok 4.20 reasoning model for text and image understanding, instruction following, tool use, and structured responses.

Model specs

Model ID: grok-4.20-0309-reasoning

Context length: 1M
Max output: 30K
I/O modalities
Released: 2026-03

API endpoints

One MixRoute gateway, OpenAI-compatible

OpenAI-compatible /v1/chat/completions POST
OpenAI-compatible /v1/responses POST

Pricing

Flat rate, unit: /1M Tokens

Input

$1.2500 /1M Tokens

Completion

$2.5000 /1M Tokens

Cache read

$0.2000 /1M Tokens

Selection summary

Quickly judge whether it fits your workload

What is this model good for?

A Grok 4.20 reasoning model for text and image understanding, instruction following

A Grok 4.20 reasoning model for text and image understanding, instruction following, tool use, and structured responses.

What should you check before using it?

1,000,000 context, 30,000 output tokens

xAI model that supports reasoning, tool calling and structured output. Knowledge cutoff: 2025-09. Released 2026-03-09.

Why use it through MixRoute?

Swap the base URL, keep the Grok 4.20 client

MixRoute serves Grok 4.20 on the OpenAI-compatible endpoint /v1/chat/completions; point your existing client at https://api.mixroute.ai/v1 with the model ID grok-4.20-0309-reasoning and re-run your integration tests.

Capabilities & compatibility

Unconfirmed capabilities stay "Unknown," no guesses

Tool calling

Grok 4.20 supports function and tool calls.

EX Send a tools definition; the response returns tool_calls to execute and feed results back.

Structured output

Grok 4.20 can produce JSON-formatted output on demand.

EX response_format: { type: "json_schema" } forces valid JSON output.

Streaming

Grok 4.20 supports streamed responses.

EX stream: true streams tokens incrementally, so chat UIs render as they arrive.

Prompt caching

Grok 4.20 supports prompt caching under supported routing conditions.

EX Keep the system prompt and tool definitions at the start of the request; repeated prefixes are automatically billed at the cache-read rate.

Vision input

Grok 4.20 can process image inputs alongside text.

EX Pass a base64-encoded image in a image_url content part alongside text messages.

OpenAI SDK

Call Grok 4.20 through MixRoute's OpenAI-compatible endpoint.

EX Change base_url to https://api.mixroute.ai/v1; everything else follows the OpenAI style.

Token cost estimator

Live estimate from this page's pricing, not an actual bill

Input tokens Max per request 1M

Output tokens Max per request 30K

Requests / month

Cache hit rate 0%

Share of the same prefix read repeatedly, up to 100%

FAQ

Before switching production traffic to Grok 4.20, run a pilot on a representative slice of your traffic and check output quality, latency at peak concurrency, and cost per request. Verify the error and retry behaviour, and confirm the request limits you depend on match your plan.

Get started

01

Create an API key

Generate a key in the Console; one key calls every model.
02

Set the base URL

Fully OpenAI SDK-compatible; just swap the URL to connect.

https://api.mixroute.ai/v1
03

Specify the model ID

In the request's model field, enter:

grok-4.20-0309-reasoning

Create an API key

New users get $5 in free credits

Test this model and alternate routes with the same request format

Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.

Create an API key View integration docs