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x-aix-ai·Apr 30, 2026

xAI: Grok 4.3

x-ai/grok-4.3
context
1M
Max Output
—
Input / 1M
$1.25
Output / 1M
$2.50

About

Grok 4.3 is a reasoning model from xAI, released in 2026 as an incremental upgrade focused on reasoning quality, response speed, and tool-use reliability. It accepts text and image inputs with text output and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual accuracy. Reasoning effort can be configured across none, low, medium, and high levels, with low as the default. It supports a 1M-token context window with no fixed output token limit, making it applicable to long-document analysis, deep research, and multi-step agentic tasks. Pricing is tiered: requests exceeding 200K total tokens are billed at a higher rate.

Capabilities

Context Length
1M
Max Output
—
Reasoning
Yes
In
text, image
Out
text

Benchmarks

View leaderboard
37.6#37 of 133
Intelligence Index
41.0#35 of 118
Coding Index

Reasoning & Knowledge

GPQA Diamond90.1%
HLE35.0%

Coding & Agentic

SciCode47.3%
Terminal-Bench Hard37.9%

Source: Artificial Analysis

Pricing

Full pricing
Type≤200K>200K
Input$1.25$2.50
Output$2.50$5.00
Cache Read$0.20$0.40
Web Search$0.0050 / call

API

API reference

OpenAI-compatible · Model ID x-ai/grok-4.3

curl https://api.elliotgate.com/v1/chat/completions \
  -H "Authorization: Bearer sk-omg-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "x-ai/grok-4.3",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

OFTEN COMPARED

Grok 4.3 comparisons

Decide which model wins on the dimensions that matter for your workload — context, benchmarks, pricing, or serving latency.