Grok 4.3
xAI's reasoning flagship with always-on reasoning, native video input, 1M context, and significantly cheaper API pricing
Grok 4.3
xAI • May 2026
Training Data
Up to late 2025
Grok 4.3
May 2026
Parameters
Not disclosed (estimated ~3T total, ~500B active, MoE)
Training Method
Reasoning-tuned MoE with extended chain-of-thought
Context Window
1,000,000 tokens
Knowledge Cutoff
December 2025
Key Features
Native Video Input • Always-On Reasoning • Prompt Caching • 159 tokens/sec output
Capabilities
Reasoning: Outstanding
Vision: Outstanding
Agentic: Excellent
What's New in This Version
First xAI model with native video input (text/image/video); ~40% cheaper than Grok 4.20 ($1.25 in / $2.50 out per MTok); replaces 8 legacy xAI models retiring May 15, 2026
xAI's reasoning flagship with always-on reasoning, native video input, 1M context, and significantly cheaper API pricing
What's New in This Version
First xAI model with native video input (text/image/video); ~40% cheaper than Grok 4.20 ($1.25 in / $2.50 out per MTok); replaces 8 legacy xAI models retiring May 15, 2026
Technical Specifications
Key Features
Capabilities
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