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GPT-5.6 Luna vs Gemini 3.7 Flash

The value tier where volume work actually runs, at its current edge: OpenAI's Luna against the newest Gemini Flash.

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 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
2.2 credits / 1M tokens ($0.20 raw)
Output price
13.2 credits / 1M tokens ($1.20 raw)
Vision (image input)
Yes
Tool calling
Yes
Extended reasoning
No

Best for

  • Balanced everyday work: writing, questions, brainstorming and summarization
  • 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

Gemini 3.7 Flash

Google

Gemini 3.7 Flash is a multimodal model from Google for fast agentic workflows, coding, and complex multi-step reasoning. It is designed for tasks that require responsive performance and reliable multi-step...

Provider
Google
Context window
1.0M tokens
Input price
4.1 credits / 1M tokens ($0.38 raw)
Output price
20.6 credits / 1M tokens ($1.88 raw)
Vision (image input)
Yes
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
  • 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 Luna and Gemini 3.7 Flash 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 Luna detailsGemini 3.7 Flash detailsAll comparisons

Explore Zeplik

GPT-5.6 Luna vs Gemini 3.7 Flash - Which AI Model to Use | Zeplik Chat