Gemini 3.8 Flash vs Gemini 3.1 Pro
Gemini 3.8 Flash is cheaper: 3x less on input and 3x less on output.
Side by Side
| Gemini 3.8 Flash | Gemini 3.1 Pro | |
|---|---|---|
| Input /1M | $0.75 | $2.0 |
| Output /1M | $3.75 | $12.0 |
| Cache /1M | $0.075 | $0.2 |
| Batch in/out | $0.375/$1.875 | — |
| Context | 1M | — |
| Tiers | >200k tier: $4 in / $18 out |
Workload Cost Calculator
Gemini 3.8 Flash:
Gemini 3.1 Pro:
Difference:
Frequently Asked Questions
Gemini 3.8 Flash or 3.1 Pro for coding?
3.8 Flash costs ~62% less input ($0.75 vs $2.00) and 69% less output ($3.75 vs $12.00); 3.1 Pro adds tiered >200k long-context rates. For most coding, 3.8 Flash wins on price-performance.
Does Gemini 3.1 Pro have a long-context tier?
Yes — prompts over 200k tokens bill at $4 in / $18 out, double the base tier.