Grok 4 Fast
ZenMux
Grok 4 Fast by ZenMux costs $0.20 per 1M input tokens and $0.50 per 1M output tokens, with a 2M-token context window.
Pricing
Input (per 1M tokens)
$0.20
Output (per 1M tokens)
$0.50
Cached input (per 1M)
$0.05
Specifications
- Provider
- ZenMux
- Context window
- 2M tokens
- Parameters
- —
- Released
- Sep 2025
- Open weights
- No
- Frontier model
- No
Benchmarks
- LMArena WebDev Elo
- 1158.7
Compare Grok 4 Fast with…
FAQ
How much does Grok 4 Fast cost?
Grok 4 Fast is priced at $0.20 per 1M input tokens and $0.50 per 1M output tokens. Output tokens cost more than input.
What is Grok 4 Fast's context window?
Grok 4 Fast supports a context window of 2M tokens — the maximum prompt plus response length it can handle in a single request.
Is Grok 4 Fast open weight?
No — Grok 4 Fast is a closed/proprietary model accessed via API.
Data as of 2026-06-28. Source: models.dev (open). Pricing is per 1M tokens (USD); confirm with the provider before production use.