GPT-5.6 Luna vs DeepSeek V4 Flash
OpenAI's efficient tier against DeepSeek's open-weight speed variant.
What the numbers say
- DeepSeek V4 Flash is about 33x cheaper on output tokens (2.0 vs 66.0 credits per 1M).
- GPT-5.6 Luna accepts images; DeepSeek V4 Flash is text-only.
- GPT-5.6 Luna 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 Luna
OpenAI
GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...
- Provider
- OpenAI
- Context window
- 1.1M tokens
- Input price
- 11.0 credits / 1M tokens ($1.00 raw)
- Output price
- 66.0 credits / 1M tokens ($6.00 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 Flash
DeepSeek
DeepSeek V4 Flash is an efficiency-optimized Mixture-of-Experts model from DeepSeek with 284B total parameters and 13B activated parameters, supporting a 1M-token context window. It is designed for fast inference and...
- Provider
- DeepSeek
- Context window
- 1.0M tokens
- Input price
- 0.99 credits / 1M tokens ($0.090 raw)
- Output price
- 2.0 credits / 1M tokens ($0.18 raw)
- Vision (image input)
- No
- 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 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 Luna and DeepSeek V4 Flash in the same chat, so you can switch mid-conversation and compare answers on the work you actually do.