xAI: Grok 4.20 Multi-Agent
Grok 4.20 Multi-Agent is a reasoning model from xAI released on Mar 9, 2026. It reads text, images and files and writes text, with a 1M token context window and up to 30K tokens per reply.
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It costs $1.25 per million input tokens and $2.50 per million output tokens. Cached input bills at $0.20, 84% less than fresh input.
It supports structured JSON output and prompt caching.
- Modalities
- In / out price
- $1.25 / $2.50 per 1M
- Context
- 1M
- Max output
- 30K
- Released
- Mar 9, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Grok 4.20 Multi-Agent pricing
USD, as listed on Oct 19, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $1.25 / 1M tokens | |
|---|---|---|
| Output | $2.50 / 1M tokens | |
| Cached input (read) | $0.20 / 1M tokens | 84% off input |
| Prompts over 200K | $2.50 in, $5 out | long context rate |
| Prompts over 200K | $2.50 in, $5 out | long context rate |
What Grok 4.20 Multi-Agent costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Grok 4.20 Multi-Agent through an OpenAI compatible API.
- Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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Grok 4.20 Multi-Agent questions
How much does the Grok 4.20 Multi-Agent API cost?
$1.25 per million input tokens and $2.50 per million output tokens, with cached input at $0.20. Prompts over 200K tokens bill at $2.50 input and $5 output. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Grok 4.20 Multi-Agent?
1,000,000 tokens of input, and it can write up to 30,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Does Grok 4.20 Multi-Agent support tool calling?
Not through the standard tools parameter. For an agent that calls your APIs, pick a model from the alternatives below that does.
Is Grok 4.20 Multi-Agent open source?
No. xAI serves it through an API only, so you cannot download the weights or host it yourself.
When was Grok 4.20 Multi-Agent released?
Mar 9, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 19, 2026. The summary is written from these facts.