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...
- 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 tokens | Provider | + 3% fee | You 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
| Category | Elo | Win rate | Rank |
|---|---|---|---|
| agenticgamedevagents | 1033 | 27.6% | #10 |
| agentichtmlslidesagents | 1066 | 31.8% | #10 |
| agenticslidesagents | 1072 | 31.9% | #10 |
| agenticslides(html)agents | 1066 | 31.7% | #10 |
| agenticslides(python-pptx)agents | 1068 | 32.4% | #10 |
| androidnativeagents | 1074 | 28.6% | #23 |
| Full-stackagents | 1072 | 31.4% | #26 |
| godotgamedevagents | 1134 | 38.6% | #16 |
| htmlslidesagents | 1066 | 31.8% | #12 |
| Mobile appsagents | 1146 | 39.1% | #26 |
| pptxslidesagents | 1071 | 32.5% | #9 |
| python-pptxslidesagents | 1074 | 31.1% | #10 |
| Web appsagents | 1194 | 46.6% | #14 |
| 3Dmodels | 1202 | 44.7% | #43 |
| ASCII artmodels | 1189 | 46.9% | #27 |
| Codemodels | 1243 | 49.6% | #31 |
| Data vizmodels | 1234 | 48.4% | #35 |
| Game devmodels | 1242 | 49.7% | #34 |
| SVGmodels | 1140 | 41.8% | #44 |
| UI componentsmodels | 1250 | 49.1% | #31 |
| Websitesmodels | 1244 | 50.2% | #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.
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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