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Grok 4.5 vs Grok 4.3

Grok 4.5 against the release it replaced, which was cheaper per token and read twice the context.

Figures as of , read live from the model registry Zeplik bills against.

What the numbers say

Derived from the live registry Zeplik routes and bills against. Credits: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.

Side by side

Grok 4.5

SpaceXAI

Grok 4.5 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.

Provider
SpaceXAI
Context window
500K tokens
Input price
24.0 credits / 1M tokens ($2.00 raw)
Output price
72.0 credits / 1M tokens ($6.00 raw)
Vision (image input)
Yes
Tool calling
Yes
Extended reasoning
No

Best for

  • Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
  • Very long documents and codebases: a 500K-token window fits entire books or repositories in one conversation
  • Working with images: screenshots, charts, photos and scanned documents alongside text
  • Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Grok 4.3

SpaceXAI

Grok 4.3 is a reasoning model from SpaceXAI.

Provider
SpaceXAI
Context window
1M tokens
Input price
15.0 credits / 1M tokens ($1.25 raw)
Output price
30.0 credits / 1M tokens ($2.50 raw)
Vision (image input)
Yes
Tool calling
Yes
Extended reasoning
No

Best for

  • Balanced everyday work: writing, questions, brainstorming and summarization
  • Very long documents and codebases: a 1M-token window fits entire books or repositories in one conversation
  • Working with images: screenshots, charts, photos and scanned documents alongside text
  • Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Try both on Zeplik

The honest answer to most model debates is to run your own prompt on both. Zeplik puts Grok 4.5 and Grok 4.3 in the same chat, so you can switch mid-conversation and compare answers on the work you actually do.

Pick a model and ask. Your prompt opens in the Zeplik app with that model selected.

Model to ask

Frequently asked questions

What is the difference between Grok 4.5 and Grok 4.3?
Grok 4.3 is about 2.4x cheaper on output tokens (30.0 vs 72.0 credits per 1M). Grok 4.3 takes noticeably more context: 1M vs 500K tokens. Grok 4.5 is the newer release (July 2026 vs April 2026).
Is Grok 4.5 or Grok 4.3 cheaper?
Grok 4.3 is cheaper: 30.0 credits per million output tokens against 72.0. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.
Which has the larger context window, Grok 4.5 or Grok 4.3?
Grok 4.3, at 1M tokens against 500K.
Can I use both Grok 4.5 and Grok 4.3 on Zeplik?
Yes. Zeplik is a multi-model chat, so both sit behind one account and you can switch between them mid-conversation to compare answers on your own prompt.
Do Grok 4.5 and Grok 4.3 need a paid plan?
Both need a paid plan (Plus or above). Usage is then billed in credits from your monthly allowance.

Related comparisons

Grok 4.5 detailsGrok 4.3 detailsAll comparisons

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