MODELS / XAI

Grok 4.20 Reasoning

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 adherence, delivering consistently precise and truthful responses.

TEXTREASONINGREASONINGTOOL-USEIMPLICIT-CACHINGVISIONFILE-INPUTWEB-SEARCH
—
CONTEXT WINDOW
2M
MAX OUTPUT TOKENS
$1.25 / 1M tokens
INPUT PRICE
$2.50 / 1M tokens
OUTPUT PRICE
QUICKSTART

Call it in one request.

OpenAI-compatible — change the base URL, and the setup is complete.

SHELL
curl https://enterprise.blackbox.ai/v1/chat/completions \
  -H "Authorization: Bearer $BLACKBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "blackboxai/xai/grok-4.20-reasoning",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
INPUT: image, textOUTPUT: textRELEASED: 2026-03-10
RELATED MODELS

Also worth a look.

XAI

Grok 4.1 Fast Non-Reasoning

1M context · $0.2 / 1M tokens input · $0.5 / 1M tokens output

XAI

Grok 4.1 Fast Reasoning

1M context · $0.2 / 1M tokens input · $0.5 / 1M tokens output

XAI

Grok 4.20 Beta Non-Reasoning

— context · $1.25 / 1M tokens input · $2.50 / 1M tokens output