What should you evaluate before moving production traffic to Grok 4.20 Multi-Agent Beta?

Before switching production traffic to Grok 4.20 Multi-Agent Beta, 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.

How are reasoning tokens billed on Grok 4.20 Multi-Agent Beta?

Reasoning tokens are billed as output on Grok 4.20 Multi-Agent Beta, at $6.0000 per 1M tokens. They are generated before the visible answer and count toward both latency and spend, so a higher reasoning setting costs more even when the final answer is short.

Can you call Grok 4.20 Multi-Agent Beta with the OpenAI SDK you already use?

Yes. Grok 4.20 Multi-Agent Beta 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-multi-agent-beta-0309 . Keep your current request and response handling.

What is the rate limit for Grok 4.20 Multi-Agent Beta?

The current model record does not publish a numeric rate limit for Grok 4.20 Multi-Agent Beta. 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.

Does Grok 4.20 Multi-Agent Beta have a free tier?

Grok 4.20 Multi-Agent Beta is billed per use and the record publishes no free-tier allowance. The current published rates are input $2.0000 per 1M tokens and output $6.0000 per 1M tokens. Trial credit or promotional quota is tied to your account rather than to the model, so check the console before planning around a free tier.

Model detail

grok-4.20-multi-agent-beta-0309

Provided by xAI

Pay-as-you-go

Grok 4.20 Multi-Agent Beta is a variant of xAI’s Grok 4.20 designed for collaborative, agent-based workflows. Multiple agents operate in parallel to conduct deep research, coordinate tool use, and synthesize information across complex tasks. Reasoning effort behavior: - low / medium: 4 agents - high / xhigh: 16 agents

Model specs

Model ID: grok-4.20-multi-agent-beta-0309

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

API endpoints

One MixRoute gateway, OpenAI-compatible

OpenAI-compatible /v1/chat/completions POST

Pricing

Flat rate, unit: /1M Tokens

Input

$2.0000 /1M Tokens

Completion

$6.0000 /1M Tokens

Cache read

$0.2000 /1M Tokens

Selection summary

Quickly judge whether it fits your workload

What is this model good for?

Variant of xAI’s Grok 4.20 designed for collaborative, agent-based workflows

Grok 4.20 Multi-Agent Beta is a variant of xAI’s Grok 4.20 designed for collaborative, agent-based workflows.

What should you check before using it?

1,000,000 context tokens

xAI model that supports reasoning, tool calling and structured output. Knowledge cutoff: 2025-09. Released 2026-03-10.

Why use it through MixRoute?

Grok 4.20 Multi-Agent Beta runs tools and structured output here

Tool calling and structured output run on that route as well. MixRoute serves Grok 4.20 Multi-Agent Beta 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-multi-agent-beta-0309 and re-run your integration tests.

Capabilities & compatibility

Unconfirmed capabilities stay "Unknown," no guesses

Tool calling

Grok 4.20 Multi-Agent Beta 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 Multi-Agent Beta can produce JSON-formatted output on demand.

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

Streaming

Grok 4.20 Multi-Agent Beta supports streamed responses.

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

Prompt caching

Grok 4.20 Multi-Agent Beta 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 Multi-Agent Beta 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 Multi-Agent Beta 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

Requests / month

Cache hit rate 0%

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

FAQ

Grok 4.20 Multi-Agent Beta 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.

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-multi-agent-beta-0309

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