GPT-5.6 Sol vs DeepSeek V4 Pro
Closed flagship against the open-weight challenger that undercuts it dramatically on price.
What the numbers say
- DeepSeek V4 Pro is about 34x cheaper on output tokens (9.6 vs 330 credits per 1M).
- GPT-5.6 Sol accepts images; DeepSeek V4 Pro is text-only.
- GPT-5.6 Sol is the newer release (July 2026 vs April 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
DeepSeek V4 Pro
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. It is designed for advanced reasoning, coding,...
- Provider
- DeepSeek
- Context window
- 1.0M tokens
- Input price
- 4.8 credits / 1M tokens ($0.43 raw)
- Output price
- 9.6 credits / 1M tokens ($0.87 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 GPT-5.6 Sol and DeepSeek V4 Pro in the same chat, so you can switch mid-conversation and compare answers on the work you actually do.