Grok 4.3
Access Grok 4.3 through one API key. xAI's latest model with 1M context.
xAI's latest Grok. Strong real-time reasoning and coding with a 1M token context window, at an aggressive price point.
No credit card required. Takes 30 seconds.
2,400+
Developers
1.2M+
API calls served
100+
Endpoints
$0.01
Per call
Yep, that's it.
Try it live
Send a message and see Grok 4.3 respond in real time.
Maximum tokens in the response.
Real-time tokens
Context Window
1M tokens
Max Output
32K tokens
Input Price
$1.75 / 1M tokens
Output Price
$3.50 / 1M tokens
Strengths
xAI's newest Grok, tuned for real-time reasoning and coding, with a 1M-token context window and up to 32K output tokens at an aggressive price point.
A 1,000,000-token window takes in long documents, large code files, and extended conversations in a single request without truncation.
Solid step-by-step reasoning and code generation, debugging, and refactoring, competitive with mid-to-high-tier models at a much lower output cost.
At $1.75 / $3.50 per 1M tokens it undercuts most 1M-context models, making it a strong default for cost-sensitive reasoning and coding workloads.
Quick start
Copy this snippet and start making calls with Grok 4.3.
const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
method: 'POST',
headers: {
'x-api-key': 'YOUR_API_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({
"model": "x-ai/grok-4.3",
"messages": [
{
"role": "user",
"content": "Explain API gateways in 2 sentences."
}
],
"maxTokens": 256
}),
});
const { data } = await res.json();
console.log(data.message.content);Why use Grok 4.3 through YepAPI?
Grok 4.3 API — pricing, context window & access
Grok 4.3 is xAI's latest model, combining strong real-time reasoning and coding with a 1M-token context window and up to 32,000 output tokens — all at an aggressive price point that undercuts most comparable models.
YepAPI exposes Grok 4.3 through an OpenAI-compatible endpoint with one API key that also reaches the larger-context Grok 4.20, Claude, Gemini, Qwen, Mistral, and Perplexity Sonar, plus SEO, SERP, and scraping APIs.
What is Grok 4.3?
Grok 4.3 is xAI's newest flagship, built around strong reasoning, coding, and access to real-time knowledge. It carries a 1,000,000-token context window and returns up to 32,000 output tokens, so it handles large inputs and long generations comfortably. Its defining trait is price: it delivers high-tier reasoning and coding quality at output rates far below most 1M-context competitors, which makes it a natural default for developers who need capability and volume without flagship pricing.
Build with Grok 4.3 via YepAPI
Call Grok 4.3 through YepAPI's OpenAI-compatible /v1/ai/chat endpoint with the model set to grok-4.3. If your code already uses the OpenAI SDK, only the base URL and model string change. Want the 2M-token Grok 4.20 for a giant document, or Sonar for a web-grounded answer? Swap one string — the same key reaches every model, so multi-model routing needs no extra integration.
Grok 4.3 API pricing — $1.75 / $3.50 per 1M tokens
Grok 4.3 costs $1.75 per 1M input tokens and $3.50 per 1M output tokens on YepAPI. The low, flat output rate is the headline: it makes long, generation-heavy tasks dramatically cheaper than on most flagship-class models, while keeping a full 1M-token context. Billing is per token with no minimums, so it scales cleanly for high-volume apps.
Grok 4.3 for cost-sensitive reasoning at scale
Grok 4.3 fits workloads where you need solid reasoning and coding across a large context but can't absorb flagship output prices: batch document analysis, coding assistants, agent backends, and high-traffic chat. The 1M-token window covers big inputs, and the cheap output rate means you can let it generate freely. It is a strong cost-anchor model in a multi-model setup.
Try Grok 4.3 free
New YepAPI accounts get $5 in free credit with no card required. At Grok 4.3's low rates, $5 buys a lot of tokens — plenty to benchmark its reasoning and coding against your current model on real workloads.
Start generating in 30 seconds
$5 free credit on signup. No credit card required. Pay per call.
What developers say
“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Frequently asked questions
xAI's latest Grok. Strong real-time reasoning and coding with a 1M token context window, at an aggressive price point.
Input tokens cost $1.75 per 1M tokens and output tokens cost $3.50 per 1M tokens through YepAPI. No monthly minimums — you only pay for what you use.
Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.
Grok 4.3 supports a 1M token context window with up to 32K output tokens per request.
Ready to use Grok 4.3?
$5 free credit on signup. No credit card required. Pay per call.
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