Grok 3 Beta API

x-ai/grok-3-beta
Advanced AI model excelling in reasoning, mathematics, and coding
Context
128K tokens
Input
$1.625 / 1M tokens
Output
$3.25 / 1M tokens
Released
Sep 9, 2025

How to use Grok 3 Beta API

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

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "x-ai/grok-3-beta",
      "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-3-beta",
    "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-3-beta","messages":[{"role":"user","content":"Hello!"}]}'

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

Grok 3 Beta API Pricing

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

Grok 3 Beta Benchmarks

BenchmarkScoreWhat it measuresSourceRetrieved
MMMU
76.0%
College-level multimodal understanding + reasoningSourceJuly 12, 2026
AIME 2025
77.3%
Competition mathematics (AIME), 2025SourceJuly 12, 2026
GPQA Diamond
80.2%
Google-proof graduate science questions (hardest subset)SourceJuly 12, 2026
Intelligence
10.4
Composite score across standardised reasoning, knowledge and problem-solving evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026

Grok 3 Beta vs other models

ModelInputOutputContextBest for
Grok 3 Beta
This page
$1.625 / 1M tokens
$3.25 / 1M tokens
128K tokens
Coding + agents
$6.5 / 1M tokens
$39 / 1M tokens
1M 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
1M tokens
Reasoning + agents

Frequently asked questions

Grok 3 Beta has a 131,000 tokens context window and can return up to 130,000 tokens.

Grok 3 Beta takes text as input and returns text.

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

Grok 3 Beta is priced at input $1.625 / 1M tokens, output $3.25 / 1M tokens, cached input $0.26 / 1M tokens.

Yes, Grok 3 Beta can stream responses as they are generated.

Grok 3 Beta was built by xAI .

Grok 3 Beta is available via the API endpoint https://api.aimlapi.com/v1/chat/completions.

It supports file input, parallel tool calls, streaming, structured output, and tool use.

Yes, it supports function calling, tool use, and parallel tool calls.

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