ReleasexAIVerified
xAI launches Grok 4.3 on the API
Listen Grok 4.3
xAI opened Grok 4.3 on its public API on April 30, 2026, after a SuperGrok Heavy beta that began April 17. xAI emphasizes improved agentic performance and a lower cost to run benchmark suites. On Artificial Analysis, Grok 4.3 posts an Intelligence Index of 53, with its largest single gain on GDPval-AA (ELO 1500, up 321 points from Grok 4.20), plus 98% on tau-squared-Bench Telecom and 81% on IFBench.
The release ships a 1M-token context window.
Corroborating sources
- Artificial Analysis — Grok 4.3
https://artificialanalysis.ai/articles/xai-launches-grok-4-3-with-improved-agentic-performance-and-lower-pricing
“The largest single benchmark improvement is on GDPval-AA, where Grok 4.3 scores an ELO of 1500, up 321 points from Grok 4.20 0309 v2s score of 1179”
- Model documentation
https://docs.x.ai/developers/models/grok-4.3