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Claude Sonnet 5 vs Claude Opus 4.8

Sonnet's balance against Opus depth, the classic Anthropic tier decision.

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 Sonnet 5

Anthropic

Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work.

Provider
Anthropic
Context window
1M tokens
Input price
24.0 credits / 1M tokens ($2.00 raw)
Output price
120 credits / 1M tokens ($10.00 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

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

Try both on Zeplik

The honest answer to most model debates is to run your own prompt on both. Zeplik puts Claude Sonnet 5 and Claude Opus 4.8 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 Sonnet 5 and Claude Opus 4.8?
Claude Sonnet 5 is about 2.5x cheaper on output tokens (120 vs 300 credits per 1M). Both take the same 1M-token context window. Claude Sonnet 5 is the newer release (June 2026 vs May 2026).
Is Claude Sonnet 5 or Claude Opus 4.8 cheaper?
Claude Sonnet 5 is cheaper: 120 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 Sonnet 5 or Claude Opus 4.8?
Neither: both take 1M tokens.
Can I use both Claude Sonnet 5 and Claude Opus 4.8 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 Sonnet 5 and Claude Opus 4.8 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 Sonnet 5 detailsClaude Opus 4.8 detailsAll comparisons

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