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
- Claude Opus 4.8 is about 1.2x cheaper on output tokens (275 vs 330 credits per 1M).
- GPT-5.6 Sol is the newer release (July 2026 vs May 2026).
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
- 55.0 credits / 1M tokens ($5.00 raw)
- Output price
- 330 credits / 1M tokens ($30.00 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.