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Grok 4.3

xAIReleased Apr 30, 2026

Grok 4.3 is a reasoning model from xAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual...

Try in playground
Context window
1M tokens
Input
text, image, file
Output
text
Tokenizer
Grok
Released
Apr 30, 2026
Reasoning
optional

Pricing

Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.

Per 1M tokensProvider+ 3% feeYou pay
Input$1.25$0.037$1.29
Output$2.50$0.075$2.58
Cache read$0.200$0.0060$0.206

Benchmarks

Artificial Analysis

Intelligence index
37.6
Coding index
42.2
Agentic index
24.1

Design Arena

CategoryEloWin rateRank
agenticgamedevagents103327.6%#10
agentichtmlslidesagents106631.8%#10
agenticslidesagents107231.9%#10
agenticslides(html)agents106631.7%#10
agenticslides(python-pptx)agents106832.4%#10
androidnativeagents107428.6%#23
Full-stackagents107231.4%#26
godotgamedevagents113438.6%#16
htmlslidesagents106631.8%#12
Mobile appsagents114639.1%#26
pptxslidesagents107132.5%#9
python-pptxslidesagents107431.1%#10
Web appsagents119446.6%#14
3Dmodels120244.7%#43
ASCII artmodels118946.9%#27
Codemodels124349.6%#31
Data vizmodels123448.4%#35
Game devmodels124249.7%#34
SVGmodels114041.8%#44
UI componentsmodels125049.1%#31
Websitesmodels124450.2%#31

Head-to-head preference voting. How we filter and rank

Supported parameters

  • frequency_penalty
  • include_reasoning
  • logprobs
  • max_tokens
  • presence_penalty
  • reasoning
  • response_format
  • seed
  • stop
  • structured_outputs
  • temperature
  • tool_choice
  • tools
  • top_logprobs
  • top_p

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model x-ai/grok-4.3.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "x-ai/grok-4.3",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.openkey.ai/v1",
    api_key=os.environ["OPENKEY_API_KEY"],
)

completion = client.chat.completions.create(
    model="x-ai/grok-4.3",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.openkey.ai/v1",
  apiKey: process.env.OPENKEY_API_KEY,
});

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

Questions

How much does Grok 4.3 cost via API?
Through OpenKey, Grok 4.3 costs $1.29 per 1M input tokens and $2.58 per 1M output tokens. That is the provider price ($1.25 / $2.50) plus a flat 3% fee — nothing else.
What is Grok 4.3's context window?
Grok 4.3 accepts up to 1M tokens of context.
Is Grok 4.3 OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "x-ai/grok-4.3" using any OpenAI SDK — only the base URL and API key change.
What inputs does Grok 4.3 support?
Grok 4.3 accepts text, image, file input and produces text output.

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