Grok 4.3
xAI · May 2026
● activeClosedmixture of expertsmultimodalAPI Available
Context Window1M tokens
Description
xAI's current flagship model with a 1-million-token context window — enough to process roughly 750,000 words or several full-length novels at once. Features configurable reasoning effort, allowing users to choose between quick responses and deeper, more thorough analysis depending on the task. Available through both the X platform and the X.ai API.
Notable Milestones
- ▸1M token context window for processing entire codebases or book collections
- ▸Configurable reasoning effort for speed vs. depth tradeoff
- ▸Integrated across X platform products
Key Innovations
Reasoning
ReasoningStructured step-by-step problem solving, often using chain-of-thought or tree-of-thought approaches.
Multimodal
MultimodalProcessing multiple types of input (text, images, audio, video) in a single model.
Long Context
Long ContextAbility to process very long inputs (100K+ tokens), enabling analysis of entire codebases or books.