x-ai/grok-4-fast

x-ai· 2M ctx

API onlytool callreasoning quant: unknown

spread (output)

30×

$0.500 – $15.00 · 7 providers

7 providers priced

Provider	Input	Output	Cache rd	Blended
ZenMux relay router	$0.200	$0.500	$0.050	$0.132
Helicone relay router	$3.00	$15.00	$0.750	$2.66
DevPass (LLM Gateway) relay router	$3.00	$15.00	$0.750	$2.66
FastRouter relay router	$3.00	$15.00	$0.750	$3.89
Poe relay router	$3.00	$15.00	$0.750	$2.66
ZenMux relay router	$3.00	$15.00	$0.750	$2.66
LLM Gateway relay router	$3.00	$15.00	$0.750	$2.66

Cheapest (output)

ZenMux

$0.500 /M

opencode.json

{
  "provider": {
    "zenmux": {
      "npm": "@ai-sdk/openai-compatible",
      "options": {
        "baseURL": "https://zenmux.ai/api/v1"
      },
      "models": {
        "x-ai/grok-4-fast": {}
      }
    }
  }
}

Set ZENMUX_API_KEY in your environment. Generated — verify against the OpenCode docs.

Output $/M over time7-day preview

Median line, min–max band. Pre-2026-09 points are catalog-recorded dates from models.dev git history, not provider effective dates.

Full price history & dynamics

This is a 7-day preview. Sign in for 30 days free; the full series and export are the API subscription.

Data: models.dev (MIT), snapshot 2026-09-19. Prices are vendor-published; verify before purchase. Methodology.