Grok 4.20 Beta Reasoning
xAI
Grok 4.20 Beta is the newest flagship model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses.
- Language
- Reasoning
- Tool use
- Vision
- File input
- Implicit caching
- Web search
- Context
- 2M
- Max output
- 2M
- Input / 1M
- $1.25
- Output / 1M
- $2.50
Quickstart
Point any OpenAI-compatible client at Maxynetic Systems and pass spacexai/grok-4.20-reasoning-beta as the model.
curl https://api.maxynetic.com/v1/chat/completions \
-H "Authorization: Bearer $MAXYNETIC_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "spacexai/grok-4.20-reasoning-beta",
"messages": [{ "role": "user", "content": "Explain routing in one line." }]
}'Pricing
Billed per token with no markup on the underlying provider rate.
Input
Per 1M prompt tokens
$1.25
Output
Per 1M completion tokens
$2.50
Cache read
Per 1M cached prompt tokens
$0.200
A 1M-token prompt with 250K tokens of output costs about $1.88.