What is xAI: Grok 4.3's context window?

xAI: Grok 4.3 supports a context window of 1,000,000 tokens, allowing you to process large documents and maintain long conversations.

How to use xAI: Grok 4.3 API via Ofox?

Simply set your base URL to https://api.ofox.io/v1 and use your Ofox API key. The API is OpenAI-compatible — just change the base URL and API key in your existing code.

xAI: Grok 4.3

Name: xAI: Grok 4.3
Brand: x-ai
Price: 1.25 USD
Availability: InStock
Rating: 5 (1 reviews)

Chat

x-ai/grok-4.3

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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

Max Output Tokens

128K

Released

2026-04-30

Capabilities

VisionFunction CallingReasoningPrompt Caching

Available Providers

Azure

Supported Protocols

openaianthropic

Playground

Open in OfoxChat

Chat with this model right here. Conversations live only in this page and are never stored.

Conversations are not saved — leaving or refreshing this page clears them.

Providers

Azure

Input Tokens

$1.25/M

Output Tokens

$2.5/M

Cache Read

$0.2/M

Web Search

$0.035/R

Protocols

openai/v1/chat/completions/v1/responses

anthropic

Code Examples

from openai import OpenAI

client = OpenAI(
    base_url="https://api.ofox.io/v1",
    api_key="YOUR_OFOX_API_KEY",
)

response = client.chat.completions.create(
    model="x-ai/grok-4.3",
    messages=[
        {"role": "user", "content": "Hello!"}
    ],
)

print(response.choices[0].message.content)

Benchmarks

LMArena ↗Evaluated as grok-4.3

xAI: Grok 4.3 scores 1443 in the Overall category of the LMArena text leaderboard (style control), ranking #63 of 374 models based on 42,706 human preference votes (updated 2026-07-12).

Benchmark scores for grok-4.3 on LMArena
Category	Arena Score	95% CI	Rank	Votes
Overall	1443	1438–1447	#63 of 374	42,706
Hard Prompts	1458	1452–1463	#74 of 374	28,292
Coding	1488	1481–1495	#66 of 369	12,055
Math	1416	1403–1430	#98 of 362	2,127
Creative Writing	1428	1419–1436	#53 of 372	7,218
Instruction Following	1414	1407–1420	#95 of 374	14,510
Chinese	1489	1475–1503	#52 of 344	2,069

Source: LMArena · CC BY 4.0 · Updated 2026-07-12 · Methodology ↗ · Ranks compare models within each category of the LMArena text leaderboard (style control). Scores come from third-party human preference evaluations, not from OFOX.