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Claude Opus 4.8 vs Gemini 3.1 Pro Preview

Premium-tier depth against premium-tier context: Opus quality versus Gemini scale.

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

Gemini 3.1 Pro Preview

Google

Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows.

Provider
Google
Context window
1.0M tokens
Input price
24.0 credits / 1M tokens ($2.00 raw)
Output price
144 credits / 1M tokens ($12.00 raw)
Vision (image input)
Yes
Tool calling
Yes
Extended reasoning
No

Best for

  • High-volume everyday tasks where speed and cost matter: summaries, drafts, quick questions
  • Very long documents and codebases: a 1.0M-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 Gemini 3.1 Pro Preview 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 Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview is about 2.1x cheaper on output tokens (144 vs 300 credits per 1M). Claude Opus 4.8 is the newer release (May 2026 vs February 2026).
Is Claude Opus 4.8 or Gemini 3.1 Pro Preview cheaper?
Gemini 3.1 Pro Preview is cheaper: 144 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 Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview, at 1.0M tokens against 1M.
Can I use both Claude Opus 4.8 and Gemini 3.1 Pro Preview 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 Gemini 3.1 Pro Preview 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 detailsGemini 3.1 Pro Preview detailsAll comparisons

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