Grok 4.20

x-ai/grok-4.20

Grok 4.20 is a reasoning 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.

Use in agent Get API key

Input price: $1.25USD / 1M tokens
Output price: $2.50USD / 1M tokens
Context window: N/A
Max output: 2M

Try the model

Playground

Open playground

Input⌘ / Ctrl + Enter

Try a prompt

Prompt

Image URL or upload

Upload

2M max outputVision

Input$1.25/MOutput$2.50/MCache read$0.20/M

OutputReady

Your response will appear here

Choose an example or write a prompt, then click Run.

Model card

Specifications

Pricing

Input: $1.25 / 1M tokens
Output: $2.50 / 1M tokens
Cache read: $0.20 / 1M tokens

Context & modalities

Max output: 2,000,000 tokens
Input: Text, image
Output: Text

Capabilities

Chat: Supported
Vision: Supported
Reasoning: Supported
Structured output: Supported
Function calling: Supported
Audio input: Not supported

Access

Provider: xAI
Model ID: x-ai/grok-4.20
Execution: sync
Base URL: https://api.sandbase.ai
API: Chat Completions API
Endpoint: /v1/chat/completions

Start building

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

Production API

Chat Completions API endpoint

https://api.sandbase.ai/v1/chat/completions

Model ID

x-ai/grok-4.20

# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/chat/completions" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "x-ai/grok-4.20",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ],
  "max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"

Choose your model

Compare models

All language models

Model	Context	Input / 1M	Output / 1M	Released
Grok 4.20This model `xAI`	—	$1.25	$2.50	Mar 31, 2026
Grok 4.7 `xAI`	488.3K	$2.00	$6.00	Sep 21, 2026
Grok 4.6 `xAI`	488.3K	$2.00	$6.00	Aug 12, 2026
Grok 4.5 `xAI`	488.3K	$2.00	$6.00	Jul 8, 2026
Grok 4.3 `xAI`	1M	$1.25	$2.50	Apr 30, 2026

Questions

FAQ

How do I call xAI Grok 4.20 through SandBase?

Create a SandBase API key, then send requests with the model ID "x-ai/grok-4.20" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

How much does xAI Grok 4.20 cost?

$1.25 per 1M input tokens and $2.50 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

Which features does xAI Grok 4.20 support?

xAI Grok 4.20 supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.

Do I need a separate xAI account?

No. One SandBase API key and balance gives you access to xAI Grok 4.20 and the other models in the catalog; you do not need to sign up with xAI separately.