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Claude Opus 5.5 vs DeepSeek V4 Pro 0423

Anthropic's newest premium tier against the open-weight model that answers for about a fifteenth of the output price -- and cannot read an image at all.

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 5.5

Anthropic

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.

Provider
Anthropic
Context window
1M tokens
Input price
48.0 credits / 1M tokens ($4.00 raw)
Output price
240 credits / 1M tokens ($20.00 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

DeepSeek V4 Pro 0423

DeepSeek

DeepSeek V4 Pro is a large-scale Mixture-of-Experts model from DeepSeek with 1.6T total parameters and 49B activated parameters, supporting a 1M-token context window.

Provider
DeepSeek
Context window
1.0M tokens
Input price
2.5 credits / 1M tokens ($0.21 raw)
Output price
5.0 credits / 1M tokens ($0.42 raw)
Vision (image input)
No
Tool calling
Yes
Extended reasoning
No

Best for

  • Everyday chat and drafting on an open-weight model with transparent lineage
  • Very long documents and codebases: a 1.0M-token window fits entire books or repositories in one conversation
  • 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 5.5 and DeepSeek V4 Pro 0423 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 5.5 and DeepSeek V4 Pro 0423?
DeepSeek V4 Pro 0423 is about 48x cheaper on output tokens (5.0 vs 240 credits per 1M). Claude Opus 5.5 accepts images; DeepSeek V4 Pro 0423 is text-only. Claude Opus 5.5 is the newer release (September 2026 vs April 2026).
Is Claude Opus 5.5 or DeepSeek V4 Pro 0423 cheaper?
DeepSeek V4 Pro 0423 is cheaper: 5.0 credits per million output tokens against 240. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.
Which has the larger context window, Claude Opus 5.5 or DeepSeek V4 Pro 0423?
DeepSeek V4 Pro 0423, at 1.0M tokens against 1M.
Can I use both Claude Opus 5.5 and DeepSeek V4 Pro 0423 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 5.5 and DeepSeek V4 Pro 0423 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 5.5 detailsDeepSeek V4 Pro 0423 detailsAll comparisons

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