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Gemini 3.5 Flash vs GPT-5.6 Luna

Gemini 3.5 Flash leads in 3 of 8 categories

Arena ELO

Tie

Cheaper

Gemini 3.5 Flash

Faster

Tie

Detailed Comparison

CategoryGemini 3.5 FlashGPT-5.6 Luna
ProviderGoogle OpenAI
Context Window1M WIN128K
Input Price ($/1M)$1.5 WINN/A
Output Price ($/1M)$9 WINN/A
Arena ELON/A N/A
CodingN/A N/A
ReasoningN/A N/A
Speed (tokens/sec)N/A N/A
Open SourceNo No

Frequently Asked Questions

Which has a larger context window?

Gemini 3.5 Flash supports 1M context, while GPT-5.6 Luna supports 128K.

Is Gemini 3.5 Flash or GPT-5.6 Luna open source?

Gemini 3.5 Flash is proprietary. GPT-5.6 Luna is proprietary.

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OpenAI narrows GPT-5.6 rollout after U.S. request

Xcode 26.6 Adds Gemini to Apple’s AI Coding Stack

Google Pushes Gemini 3.5 Pro to July

Gemini 3.5 Flash makes computer use a default, not a demo

Gemini 3.5 Pro 迟到暴露了谷歌节奏问题

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