xAI

Grok 4.20

Grok 4.20 is a Grok model from xAI, released in 2026-03. It costs $2 / $6 per 1M, has a 2M-token context window, and is best for reasoning, realtime-web-search, long-context. Last verified 2026-04-19.

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Spec sheet

Pricing

Input
$2 / 1M
Output
$6 / 1M
Cached input
$0.5 / 1M
Free tier
No

Context & speed

Context window
2M tokens
Max output
32k tokens
Throughput
~90 tok/s
Time to first token
~700 ms
Speed tier
balanced

Capabilities

Tool use
Yes
Structured output
Yes
Prompt caching
Yes
Extended thinking
Yes
Vision input
Yes
Audio in / out
No
Fine-tuning
No

Deployment

Open weights
No
On-prem
No
HIPAA eligible
No
Zero retention
No
Regions
us

Estimated monthly cost

Assumes typical token shape: 2k input, 600 output per call. Prompt caching is excluded from these figures.

10k calls/mo
$76.00
per month
100k calls/mo
$760.00
per month
1M calls/mo
$7.6k
per month

When to use Grok 4.20

Sweet spot

  • reasoning
  • realtime web search
  • long context
  • x data

Known trade-offs

  • US-only regions
  • younger SDK ecosystem

Works with

xAI SDKOpenAI-compatible APICursorVercel AI SDKOpenRouter

Compare Grok 4.20 to other models

vs Claude Haiku 4.5vs GPT-5.4 Minivs o4-minivs GLM-5.1vs Gemini 3 Flashvs Qwen 3.6 Plus

FAQ — Grok 4.20

How much does Grok 4.20 cost?

Grok 4.20 costs $2 / $6 per 1M tokens on the xAI API. Cached input reads cost $0.5 per 1M, cutting the input bill by roughly 75% on repeat system prompts.

What is the context window of Grok 4.20?

Grok 4.20 has a 2M-token context window with up to 32k tokens of output. That's enough for entire codebases, long transcripts, or multi-document RAG.

Does Grok 4.20 have a free tier?

No — X Premium includes Grok web chat; API is paid.

Is Grok 4.20 HIPAA / EU / on-prem friendly?

Grok 4.20 is not HIPAA-eligible, not available in an EU region, and is API-only. Zero data retention is not available.

What is Grok 4.20 best for?

Grok 4.20 is best for reasoning, realtime web search, long context, x data. Trade-offs to be aware of: US-only regions; younger SDK ecosystem.

Which tools and SDKs work with Grok 4.20?

Grok 4.20 integrates with xAI SDK, OpenAI-compatible API, Cursor, Vercel AI SDK, OpenRouter. Most major AI frameworks support it either natively or through OpenAI-compatible endpoints.