Grok 4.20 API

xAI's Grok 4.20, through an OpenAI-compatible API. Providers quote it on an open exchange, and each request goes to the offer with the lowest estimated charge that meets your rules.

Providers compete for each request. The exchange ranks the offers that meet your rules by estimated charge. It fixes your maximum charge before the first token, and you pay for the tokens that the model uses.
The OpenAI and Anthropic APIs. Use the OpenAI or Anthropic SDK that you have. Set the base URL and your key, and send grok-4.20 as the model.
Your data rules. Send x-liquid-retention: none and only offers whose provider does not keep your content compete for the request.

Facts

Model name: grok-4.20
Maker: xAI
Context window: 2M tokens
Input price: $1.251 per million tokens
Output price: $2.502 per million tokens
Providers: 1 independent provider
Regions: us

Providers

Architect: us, $1.251 input and $2.502 output per million tokens, $0.200 cache read per million tokens, 2M tokens of context

Request

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

Questions

What is Grok 4.20?: Served by intent-router: each job goes to the cheapest healthy upstream for this model.
How much does Grok 4.20 cost?: Offers now ask $1.251 per million input tokens and $2.502 per million output tokens. A job pays for the tokens it uses. The exchange picks the cheapest eligible offer.
What is the context length of Grok 4.20?: The largest offer takes 2,000,000 input tokens. A smaller offer can take less. The exchange skips an offer that cannot take your message.
What can Grok 4.20 do?: Its providers list Vision, Reasoning effort, JSON object, JSON schema, Frequency penalty, Logit bias, Log probabilities, Min-p sampling, Presence penalty, Repetition penalty, Seed, Stop sequences, Top-k sampling, Top-p sampling, Text, Tools.
What inputs and outputs does Grok 4.20 support?: Text · Images → Text.
Which providers serve Grok 4.20?: 1 independent provider quote it now, with 1 offer. The table above ranks them by the cost of a typical job.
How do I call Grok 4.20?: Send "grok-4.20" as the model in an OpenAI or Anthropic request. The API section links to setup steps for each client.
When was Grok 4.20 listed?: The exchange first listed it on 10/8/2026. This is not its release date.

Grok 4.20 API

Facts

Providers

Request

Questions

Related pages