ThinkFacility Sign in

AI models · xAI

Grok 4.3: what it is, and what we've written about it

Out now. Twice the context of the flagship at a bit over half the price. xAI never posted a launch note for it, so there's no date to give you.

Status
Live
Lab
xAI
Input
$1.25per million tokens
Output
$2.50per million tokens
Context window
1Mtokens
Max output
Not published

API model ID: grok-4.3

What we've written about Grok 4.3

September 29, 2026

Emergence World: Claude agents got replies from real humans, and Grok's town died in four days

Eight copies of the same AI town, one model each, then a phishing attack, a fake shutdown memo and a leak of every agent's diary.

September 23, 2026

Grok 4.7, Grok 4.8 and Grok Build: which Grok is out and what each one is for

Grok 4.7 shipped ten days after Musk said it needed a few more days, and the next one has a size but no date.

How Grok 4.3 compares on price and context

Price per million tokens

inputoutput

  1. GPT-6 Astra$10 / $50
  2. Grok 4.7$2 / $6
  3. Grok 4.6$2 / $6
  4. Grok 4.5$2 / $6
  5. Muse Spark 1.3$1.25 / $4.25
  6. Gemini 3.8 Flash$0.75 / $3.75
  7. Grok 4.3$1.25 / $2.50
Context window, in tokens

how much it reads at once

  1. GPT-6 Astra1.05M
  2. Muse Spark 1.31.05M
  3. Gemini 3.8 Flash1.05M
  4. Grok 4.31M
  5. Grok 4.7500K
  6. Grok 4.6500K
  7. Grok 4.5500K

Next to the newest xAI models and the current model from other labs. Prices are in US dollars per million tokens.

What is Grok 4.3?

Grok 4.3 is a model from xAI, built in the US. It's out, and you can use it today.

When did Grok 4.3 come out?

It's out, but we haven't found a date from xAI for when it shipped, so this page doesn't give one.

More from xAI

xAILive

Grok 4.7

in /1M
$2
out /1M
$6
context
500K
xAILive

Grok 4.6

in /1M
$2
out /1M
$6
context
500K
xAILive

Grok 4.5

in /1M
$2
out /1M
$6
context
500K
xAILive

Grok Build 0.1

in /1M
$1
out /1M
$2
context
256K
xAIRumored

Grok 5

No price or context window published yet

xAIAnnounced

Grok 4.8

No price or context window published yet

More news: xAI news and Grok updates

.