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GPT-5.6 Sol vs Claude Opus 4.8

The head-to-head at the very top: each lab's premium tier on the hardest work.

What the numbers say

Derived from the live registry Zeplik routes and bills against. Credits: 1 credit = $0.10, raw provider rate with a 1.10x margin.

Side by side

GPT-5.6 Sol

OpenAI

GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series. It is suited for complex reasoning, coding, and agentic workflows, and is particularly strong at command-line and multi-step coding tasks...

Provider
OpenAI
Context window
1.1M tokens
Input price
22.0 credits / 1M tokens ($2.00 raw)
Output price
110 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 1.1M-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. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token...

Provider
Anthropic
Context window
1M tokens
Input price
55.0 credits / 1M tokens ($5.00 raw)
Output price
275 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 GPT-5.6 Sol 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
GPT-5.6 Sol detailsClaude Opus 4.8 detailsAll comparisons

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GPT-5.6 Sol vs Claude Opus 4.8 - Which AI Model to Use | Zeplik Chat