Gemini 3.1 Pro API Pricing & Cost Calculator

Gemini 3.1 Pro costs $2.00 per 1M input tokens and $12.00 per 1M output tokens. A typical chat call (1000 input + 500 output tokens) costs approximately $0.0080. Use the calculator above to estimate your specific use case.

Gemini 3.1 Pro supports a 1049K token context window with a max output of 65,536 tokens. Knowledge cutoff: 2026-01.

Yes. Cached input is priced at $0.20 per 1M tokens — 90% cheaper than uncached input. This is especially valuable for repeated system prompts, long-context retrieval, and chat threads with shared history.

Yes. Gemini 3.1 Pro supports the Batch API at $1.00 input / $6.00 output per 1M tokens — typically 50% off standard pricing. Batch jobs complete within ~24 hours, ideal for non-realtime workloads like overnight data processing or content generation pipelines.

Yes, Gemini 3.1 Pro accepts image input. Vision token pricing is generally calculated based on image dimensions and folded into the input token count. Specific image-specific pricing varies — refer to Google's official documentation.

Token counts for Gemini 3.1 Pro are estimated from character ratios (~10-20% margin). Cost calculations use prices verified on 2026-08-24. For final billing accuracy, always verify with Google's usage dashboard.

Yes, Google offers fine-tuning for Gemini 3.1 Pro. Fine-tuned model pricing is separate from base model pricing — check Google's pricing page for current fine-tuning rates.