Gemini 3.6 Flash vs GPT-5.6 Terra
Both are Mid-tier models, from Google and OpenAI respectively. Gemini 3.6 Flash is the cheaper choice overall at a 4:1 input:output ratio.
Which is cheaper
- Input price: Gemini 3.6 Flash is cheaper ($0.75 vs $2.00).
- Output price: Gemini 3.6 Flash is cheaper ($3.75 vs $12.00).
- Blended, 4:1 input:output ratio: Gemini 3.6 Flash is 66.3% cheaper ($1.35 vs $4.00 per weighted 1M tokens).
Side by side
| Spec | Gemini 3.6 Flash | GPT-5.6 Terra |
|---|---|---|
| Provider | OpenAI | |
| Tier | Mid | Mid |
| Context window | 1.05M | 1.05M |
| Max output | 66K | 128K |
| Input $/1M | $0.75 | $2.00 |
| Output $/1M | $3.75 | $12.00 |
| Cache read $/1M | $0.075 | $0.20 |
| Cache write $/1M | — | $2.50 |
| Modalities | text, image | text, image |
Gemini 3.6 Flash. Standard tier. Introductory pricing through 31 December 2026, identical to 3.7 Flash; from 1 January 2027 the rate is $1.50 input / $7.50 output, cache read $0.15 per 1M.
GPT-5.6 Terra. One flat rate: unlike Sol and Cyber, Terra has no long-context surcharge tier on the pricing page.
Sources
Gemini 3.6 Flash — verified August 29, 2026
GPT-5.6 Terra — verified August 29, 2026
Full Gemini 3.6 Flash pricing page → · Full GPT-5.6 Terra pricing page →