Grok 4.3 API

x-ai/grok-4-3
Grok 4.3 is a fast multimodal AI model built for real-time reasoning, coding, live web awareness, and large-context workflows.
Context
1M tokens
Input
$1.625 / 1M tokens
Output
$3.25 / 1M tokens

How to use Grok 4.3 API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to x-ai/grok-4-3.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "x-ai/grok-4-3",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "x-ai/grok-4-3",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"x-ai/grok-4-3","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

Grok 4.3 API Pricing

TypePrice
Input
$1.625 / 1M tokens
Output
$3.25 / 1M tokens
Cached input
$0.26 / 1M tokens

Grok 4.3 Benchmarks

BenchmarkScoreWhat it measuresSourceRetrieved
Humanity's Last Exam
35%
Expert-level questions across many domainsSourceJuly 12, 2026
GPQA Diamond
90.1%
Google-proof graduate science questions (hardest subset)SourceJuly 12, 2026
Intelligence
25.4
Composite score across standardised reasoning, knowledge and problem-solving evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026
Coding
42.2
Composite score across standardised coding evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026

Grok 4.3 vs other models

ModelInputOutputContextBest for
Grok 4.3
This page
$1.625 / 1M tokens
$3.25 / 1M tokens
1M tokens
Coding + agents
$6.5 / 1M tokens
$39 / 1M tokens
1.05M tokens
Reasoning + agents
$2.6 / 1M tokens
$13 / 1M tokens
1M tokens
Balanced coding + agents
$3.9 / 1M tokens
$19.5 / 1M tokens
1M tokens
Long-context, multimodal & agentic workflows
$0.65 / 1M tokens
$3.9 / 1M tokens
1.05M tokens
Reasoning + agents

Frequently asked questions

Grok 4.3 has a 1,000,000 tokens context window and can return up to 1,000,000 tokens.

Grok 4.3 takes image, text as input and returns text.

Use x-ai/grok-4-3 as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

Grok 4.3 is priced at input $1.625 / 1M tokens, output $3.25 / 1M tokens, cached input $0.26 / 1M tokens.

Yes, Grok 4.3 can stream responses as they are generated.

Yes, Grok 4.3 accepts image input alongside text.

Grok 4.3 was built by xAI .

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