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WhichAI / Compare / Gemini 3.5 Flash vs GPT-5.6 Luna

Gemini 3.5 FlashvsGPT-5.6 Luna

GPT-5.6 Luna scores higher on the July 16 index. Full context below: price, context window, strengths and honest limits. Verified July 26, 2026.

Gemini 3.5 Flash
GPT-5.6 Luna
Provider
Google
OpenAI
AA index
50.2
51.2
Released
n/a
2026-07-09
Context
1M
n/a
Price $/1M
$1.5 / $9
$1 / $6
Access
FREE (most generous free tier) · free API via Google AI Studio
Released July 9, 2026 · API $1/$6 per 1M tokens

n/a = not published or not yet verified. Scores marked ~ are WhichAI estimates and should not be compared 1:1 with measured scores.

In one line each

Gemini 3.5 Flash: Remarkable: the newest Flash now outscores the older 3.1 Pro on the AA index - frontier-adjacent quality, free, and the model WhichAI auto-runs with your AI Studio key.

GPT-5.6 Luna: The fast, affordable member of the 5.6 series - near-flagship scores at commodity prices; strong default for high-volume API work.

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