Grok 4.3

xAI's reasoning model for agentic tool calling, instruction following, and multimodal text generation.

Input price: $1.375
Output price: $2.75

Context: 1M
Max output: 128K

Human preference: 1397
30-day uptime: —

InputTextImageOutputText

Providers

Providers that serve this model. With Auto, each request goes to the best available provider. Prices in USD per 1M tokens; stats cover the last 30 days.

AutoInput$1.375Output$2.75Cache read$0.22Context1MMax output128KWe send each request to the best-priced healthy provider. You pay that provider’s price.xAIInput$1.375Output$2.75Cache read$0.22United StatesNo training

Pricing

All prices for this model, by service tier.

Prompt ≤ 200K tokens

Input: $1.375; per 1M tokens
Output: $2.75; per 1M tokens
Cache read: $0.22; per 1M tokens
Reasoning output: $2.75; per 1M tokens
Web search: $0.0055; per request

Prompt > 200K tokens

Input: $2.75; per 1M tokens
Output: $5.50; per 1M tokens
Cache read: $0.44; per 1M tokens
Reasoning output: $5.50; per 1M tokens
Web search: $0.0055; per request

Try it

Runs on your balance and is billed like any API request.

curl https://api.ohmygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $OHMYGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "xai/grok-4.3",
    "messages": [
      {
        "role": "user",
        "content": "Hello"
      }
    ]
  }'

import os

from openai import OpenAI

client = OpenAI(
    api_key=os.environ["OHMYGPT_API_KEY"],
    base_url="https://api.ohmygpt.com/v1",
)

response = client.chat.completions.create(
    model="xai/grok-4.3",
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.OHMYGPT_API_KEY,
  baseURL: "https://api.ohmygpt.com/v1",
});

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

The answer streams in here.

Billed by usage

Similar models

Other models with the same output types at a similar price.

Better value: more capable, lower price
Pareto frontier
Similar models

Capability scores are from Epoch AI’s Epoch Capabilities Index (CC BY 4.0, as of 2026-11-10), which combines dozens of benchmarks with GPT-5 set at 150. epoch.ai/eci

Price: our current input price per 1M tokens in USD, lowest across channels. Dated snapshots and resold copies of the same model are merged into one point; free models are not shown.

Shaded area: capability above and price below the median of all models. Pareto frontier: no other model is both cheaper and more capable.

Grok 4.3This model

Capability: —
Input: $1.375
Output: $2.75

Grok 4.20 (0309, Non-Reasoning)

Capability: —
Input: $1.375
Output: $2.75

Gemini 3.5 Flash

Capability: 155
Input: $1.35
Output: $8.10

Qwen3.8 Max

Capability: 157
Input: $1.485–$2.00
Output: $4.4559–$6.00

Claude Opus 5 (Reseller)

Capability: 164
Input: $1.50
Output: $7.50

Human preference ratings are from the LMArena Text Arena (CC BY 4.0, as of 2026-11-09): Elo ratings from blind votes, on a different scale from capability scores. lmarena.ai/leaderboard/text