Gemini 3.1 Pro API Pricing & Cost Calculator

How this is calculated

Gemini 3.1 Pro (<=200k) is priced at $2.00 per million input tokens and $12.00 per million output tokens, supporting a 75% caching discount ($0.50 per million) and a 50% batch discount ($1.00 per million inputs, $6.00 per million outputs).

Verdict

At $2/M input and $12/M output, with cached input at $0.50/M and batch at $1.00/$6.00, Gemini 3.1 Pro sits below the Anthropic flagship pricing on every row. The standout is the 2M-token context window, which is what makes the 75% cache discount worth chasing: drop a large persistent context block into the prompt (a corpus, a codebase, a long doc set) and the cached input rate turns an otherwise huge per-call cost into a small fixed fee. The 25% cache discount gap against Anthropic's 90% is the trade-off, but the dollar math still favors Gemini because the base rates are lower.