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Claude Opus 4.8 vs Grok 4.5

Anthropic's deepest model against xAI's flagship on frontier-difficulty work.

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

Claude Opus 4.8

Anthropic

Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family.

Provider
Anthropic
Context window
1M tokens
Input price
60.0 credits / 1M tokens ($5.00 raw)
Output price
300 credits / 1M tokens ($25.00 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 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

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

Try both on Zeplik

The honest answer to most model debates is to run your own prompt on both. Zeplik puts Claude Opus 4.8 and Grok 4.5 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 Claude Opus 4.8 and Grok 4.5?
Grok 4.5 is about 4.2x cheaper on output tokens (72.0 vs 300 credits per 1M). Claude Opus 4.8 takes noticeably more context: 1M vs 500K tokens. Grok 4.5 is the newer release (July 2026 vs May 2026).
Is Claude Opus 4.8 or Grok 4.5 cheaper?
Grok 4.5 is cheaper: 72.0 credits per million output tokens against 300. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.
Which has the larger context window, Claude Opus 4.8 or Grok 4.5?
Claude Opus 4.8, at 1M tokens against 500K.
Can I use both Claude Opus 4.8 and Grok 4.5 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 Claude Opus 4.8 and Grok 4.5 need a paid plan?
Both need a paid plan (Plus or above). Usage is then billed in credits from your monthly allowance.

Related comparisons

Claude Opus 4.8 detailsGrok 4.5 detailsAll comparisons

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