Grok 4.3

Grok 4.3 is a reasoning model from SpaceXAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual accuracy. Reasoning can be configured between none/low/medium/high (default low) effort levels. It supports a 1 million token context window with no output token limit, making it well-suited for long-document analysis, deep research, and multi-step agentic tasks. Pricing is tiered: requests exceeding 200k total tokens are billed at a higher rate.

ChatxAI1M tokens$1.3626 / $2.7251 · 1M

x-ai/grok-4.3

Context
1M tokens
Completion cap
—
Tools
Yes
JSON
Yes
Released
2026-04-30

Call it from Geek Hub

Same OpenAI SDK. Change the base URL and the model id.

curl https://api.geekhub.mx/v1/chat/completions \
  -H "Authorization: Bearer $GEEKHUB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "x-ai/grok-4.3",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is Grok 4.3?
Grok 4.3 is a reasoning model from SpaceXAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual accuracy. Reasoning can be configured between none/low/medium/high (default low) effort levels. It supports a 1 million token context window with no output token limit, making it well-suited for long-document analysis, deep research, and multi-step agentic tasks. Pricing is tiered: requests exceeding 200k total tokens are billed at a higher rate. Grok 4.3 runs on the Geek Hub API (OpenAI-compatible). Model id: x-ai/grok-4.3.
Is Grok 4.3 free?
No. Input is $1.3626 per 1M tokens and output is $2.7251 per 1M tokens on Geek Hub (markup included).
What is the context length of Grok 4.3?
Grok 4.3 has a 1M tokens context window.
Does Grok 4.3 support tool calling and structured outputs?
Grok 4.3 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
When was Grok 4.3 released?
Grok 4.3 was released on 2026-04-30.

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