xAI (Grok)

Grok 4.20

xAI's Grok 4.20 flagship with reasoning variants and prompt caching for high-throughput agent loops.

ActiveAvailable from 2 providers
Tool callingCan invoke external tools and APIs (function calling) mid-response.Structured outputCan return JSON or schema-constrained responses instead of free text.ReasoningUses extended thinking / chain-of-thought for harder multi-step problems.Effort controlLets you dial thinking depth (low / medium / high) to trade cost for quality.Fine-tuningSupports training a custom variant on your own data (vendor fine-tune API or self-hosted open weights).

Source: xAI API docs, xAI console

Price per 1M tokens
$2 in / $6 out
Context window1,000,000
Cache read$0.2 / M
ModalitiesText, Image → Text
Priced across2 providers

Pricing

Every billing leg from the live catalog, in USD per 1M tokens.

Billing legRate
Input$2 / M
Output$6 / M
Cache read$0.2 / M

Cost calculator

Billing-grade math over the rate card above, including the thinking tokens most estimates miss.

Hidden reasoning tokens bill as output. 1.0x = thinking off. Medium-effort reasoning typically lands near 3x; heavy reasoning runs 6x to 8x. Set it to match your workload.

Estimated monthly cost
$760
at current list prices
Fresh input$400
Cached input$0.00
Output incl. thinking$360
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Compare providers

The same model, priced across every platform that serves it. Lowest combined in/out rate is flagged.

PlatformInput / MOutput / MCache read / MBatchAccess
xAI
$2$6$0.2—First-party API
xAILowest
$1.25$2.5$0.2—via OpenRouter

Price history

Has this model gotten cheaper or more expensive?

No changePriced at $2 / $6 per 1M since May 11, 2026.

More from xAI (Grok)

Other models from the same provider.

Grok 4.5
xai/grok-4.5
$2 / $6 in / out per 1M
Grok 4.3
xai/grok-4.3
$1.25 / $2.5 in / out per 1M
Grok 3
xai/grok-3
$3 / $15 in / out per 1M
Grok 3 Mini
xai/grok-3-mini
$0.3 / $0.5 in / out per 1M

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Rates are generated from SuperPenguin's live pricing catalog.