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Grok 4.3

Call Grok 4.3 for general-purpose chat, reasoning, and tool use — through one OpenAI-compatible endpoint, with local payments and a free API key to begin.

Model id grok-4.3 Context 1M tokens Plan Basic (free) & up Input $1.25 /1M Output $2.50 /1M

Last updated June 5, 2026

Pricing

Per 1M tokens, billed from your credit balance — there is no markup on usage.

DirectionPrice / 1M tokens
Input$1.25
Output$2.50
How billing works. The rate above is what usage costs against your prepaid credits on a paid plan — no per-token markup, and Zylo's flat 25% platform fee applies only when you add credits. The free Basic plan instead gives a daily allowance of Basic-tier models (10 requests/min, no card, no credits). Grok 4.3 is a Basic-tier model — callable on the free Basic plan within its daily allowance and a global 10 requests/min limit. Prices update live from our catalogue.

Quickstart

Already using the OpenAI SDK? Change two lines — base_url and your key — and set the model to grok-4.3.

Terminal
curl https://api.zyloai.net/v1/chat/completions \
  -H "Authorization: Bearer YOUR_ZYLO_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "grok-4.3",
    "messages": [{"role": "user", "content": "Hello from Zylo!"}]
  }'
Python
# pip install openai
from openai import OpenAI

client = OpenAI(
    api_key="YOUR_ZYLO_KEY",
    base_url="https://api.zyloai.net/v1",
)

response = client.chat.completions.create(
    model="grok-4.3",
    messages=[{"role": "user", "content": "Hello from Zylo!"}],
)
print(response.choices[0].message.content)
Node.js
// npm install openai
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "YOUR_ZYLO_KEY",
  baseURL: "https://api.zyloai.net/v1",
});

const response = await client.chat.completions.create({
  model: "grok-4.3",
  messages: [{ role: "user", content: "Hello from Zylo!" }],
});
console.log(response.choices[0].message.content);

Migrating?

On OpenRouter this model is x-ai/grok-4.3; on Zylo, use the id grok-4.3.

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Frequently asked questions

How much does Grok 4.3 cost on Zylo?

Grok 4.3 is billed at its base per-token rate: $1.25 per 1M input tokens and $2.50 per 1M output tokens, deducted from your prepaid credits. There is no markup on usage — Zylo's 25% platform fee applies only when you add credits.

Is Grok 4.3 available on the free Basic plan?

Yes. Grok 4.3 is a Basic-tier model, so you can call it on the free Basic plan within its daily usage allowance and a global limit of 10 requests per minute. The Basic plan does not include credits; paid plans (Go and up) add premium models and credits you spend on usage.

What is the context window of Grok 4.3?

Grok 4.3 supports up to 1M tokens of context through Zylo's OpenAI-compatible API.

Is Grok 4.3 OpenAI-compatible?

Yes. Point any OpenAI SDK at https://api.zyloai.net/v1, use your Zylo API key, and set the model to grok-4.3.

How do I switch Grok 4.3 from OpenRouter to Zylo?

On OpenRouter this model is x-ai/grok-4.3. On Zylo, use the bare id grok-4.3 with base URL https://api.zyloai.net/v1 — no vendor prefix.

Related reading

Guides for building on Grok 4.3 and other models through one API.

All xAI models Frontier model comparison Cheapest LLM APIs Multi-model routing

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