free-ai-api-keys

x-ai/grok-4.20

SpaceXAI: Grok 4.20

Context length
2000K
Input / 1M tokens
$1.25
Output / 1M tokens
$2.50
Released
2026-03-31
Modality
text+image+file->text

About SpaceXAI: Grok 4.20

Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...

Call SpaceXAI: Grok 4.20

Via OpenRouter: one base URL for every provider.

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "x-ai/grok-4.20",
    "messages": [{"role": "user", "content": "Say hello"}]
  }'

Direct on xAI (Grok):

curl https://api.x.ai/v1/chat/completions \
  -H "Authorization: Bearer $XAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "grok-4.20",
    "messages": [{"role": "user", "content": "Say hello"}]
  }'

xAI (Grok) keys

OpenRouter keys

OpenRouter keys work for x-ai/grok-4.20 regardless of the upstream provider.