xAI: Grok 4

xAIID: x-ai/grok-4

Grok 4 is xAI's latest reasoning model with a 256k context window. It supports parallel tool calling, structured outputs, and both image and text inputs. Note that reasoning is not exposed, reasoning cannot be disabled, and the reasoning effort cannot be specified. Pricing increases once the total tokens in a given request is greater than 128k tokens. See more details on the [xAI docs](https://docs.x.ai/docs/models/grok-4-0709)

Pricing per 1M Tokens

Input (Prompt)$3.00
Output (Completion)$15
Cache Read$0.75
Cache WriteFree
ImageN/A

Specifications

Context Length256K
Max Output TokensN/A
Input ModalitiesImage + Text
Output ModalitiesText
TokenizerGrok
Instruct TypeN/A
Top Provider Context256K
Top Provider Max OutputN/A
ModeratedNo

Compare this model

See how xAI: Grok 4 stacks up against other models.

vs xAI: Grok 4.20 Multi-Agent Betavs xAI: Grok 4.20 Betavs xAI: Grok 4.1 Fastvs xAI: Grok 4 Fastvs xAI: Grok Code Fast 1

More from xAI

xAI: Grok 4.20 Multi-Agent Beta
Input$2.00
Context2M
xAI: Grok 4.20 Beta
Input$2.00
Context2M
xAI: Grok 4.1 Fast
Input$0.20
Context2M
xAI: Grok 4 Fast
Input$0.20
Context2M
xAI: Grok Code Fast 1
Input$0.20
Context256K

Last updated: March 23, 2026

First tracked: March 23, 2026