xAI

Grok 4 Fast

xAI's discount-tier — 2M context, alt-voice, $0.20 / $0.50.

FastValueLong context

Grok 4 Fast is not currently offered on Token Harbor.

Looking for something comparable? Grok 4.5 is live on our catalog — same family, currently served and priced.

Ratings & benchmarks

Snapshot 2026-04-28

Overall

3.9 / 5

Composite of intelligence + reliability.

Output speed

150 t/s

Output tokens per second under typical load.

Time to first token

500 ms

Lower is better. Reasoning models naturally stretch this.

Value

4.5 / 5

Intelligence per dollar at typical mix.

2,000,000 tokens