Grok 4.3
Grok 4.3 is a model you reach through an API — too large to self-host, so this page covers what it does, how to access it, and what to run locally instead.
PARAMETERS
n/a
FORMAT
API
RUNS LOCALLY
No
BEST FOR
Reasoning, Real-time data, Coding
You don't run Grok 4.3 locally
Access is through the hosted API.
Apr 17, 2026 xAI flagship. Full rollout May 6. 1M context (Apr 30 expansion). Cloud only. Parameter count undisclosed (cloud API).
Strong local alternatives
Frequently asked questions
Can I run Grok 4.3 locally?
Not realistically. Grok 4.3 is a vendor-undisclosed-size model; a Q4-class build would need far beyond any consumer machine. The hosted API or a smaller open model is the practical path.
How do I access Grok 4.3?
Through the vendor-hosted API. See the official source linked on this page.
What is the best local alternative to Grok 4.3?
Qwen3 235B A22B is the strongest local model we track (235B). It runs on a single high-memory Mac or GPU; see its page for exact hardware.
Cite this page
ModelFit: Grok 4.3 — specs, memory math and hardware verdicts. https://modelfit.io/models/grok-4.3/ (dataset updated 2026-09-03, CC BY 4.0).