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Claude Haiku 5.5 vs Claude Sonnet 5

Anthropic's newest tier is also its cheapest: Haiku 5.5 answers for a twentieth of Sonnet 5's price on an identical million-token window, so the only question is how much depth the work needs.

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 Haiku 5.5

Anthropic

Claude Haiku 5.5 is Anthropic's small, fast model for high-volume, cost-sensitive work such as summarization, subagents, and browser use.

Provider
Anthropic
Context window
1M tokens
Input price
1.2 credits / 1M tokens ($0.10 raw)
Output price
6.0 credits / 1M tokens ($0.50 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 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 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

Try both on Zeplik

The honest answer to most model debates is to run your own prompt on both. Zeplik puts Claude Haiku 5.5 and Claude Sonnet 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 Haiku 5.5 and Claude Sonnet 5?
Claude Haiku 5.5 is about 20x cheaper on output tokens (6.0 vs 120 credits per 1M). Both take the same 1M-token context window. Claude Haiku 5.5 is the newer release (October 2026 vs June 2026).
Is Claude Haiku 5.5 or Claude Sonnet 5 cheaper?
Claude Haiku 5.5 is cheaper: 6.0 credits per million output tokens against 120. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.
Which has the larger context window, Claude Haiku 5.5 or Claude Sonnet 5?
Neither: both take 1M tokens.
Can I use both Claude Haiku 5.5 and Claude Sonnet 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 Haiku 5.5 and Claude Sonnet 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 Haiku 5.5 detailsClaude Sonnet 5 detailsAll comparisons

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