Gemini 3.1 Pro pricing, broken down.
Google's current Pro tier at $2 and $12 per million tokens, replacing the Gemini 2.5 line that is now marked legacy.
Gemini 3.1 Pro runs $2 per million input tokens and $12 per million output for prompts up to 200k tokens. It is the successor to Gemini 2.5 Pro, which Google now lists under legacy models at $1.25 and $10. The newer model is more expensive on both legs, which is the opposite of the direction most of this market has moved this year and worth knowing before you assume an upgrade saves money.
If you are running 2.5 Pro today nothing breaks, but a legacy listing is usually the step before a retirement date. Plan the migration on your own schedule rather than on Google's, and budget for the higher rate when you do. For input-heavy work such as RAG over large retrieved context, the input price gap between $1.25 and $2 compounds quickly at volume.
- Long-context work, where Gemini's context handling is the reason to be here
- Input-heavy RAG and document analysis pipelines
- Teams migrating off the Gemini 2.5 line before it is retired
Gemini 3.1 Pro vs the alternatives.
| Model | Input / 1M | Output / 1M | Sample request |
|---|---|---|---|
| Gemini 3.1 Pro | $2.00 | $12.00 | $0.0072 |
| Claude Sonnet 5 | $2.00 | $10.00 | $0.0064 |
| GPT-5 | $1.25 | $10.00 | $0.0055 |
Common questions.
How much does Gemini 3.1 Pro cost?
$2 per million input tokens and $12 per million output tokens for prompts up to 200k tokens. Batch processing is half that, at $1 and $6.
Is Gemini 3.1 Pro cheaper than Gemini 2.5 Pro?
No, it is more expensive. Gemini 2.5 Pro is $1.25 input and $10 output, against $2 and $12 for 3.1 Pro. Google now lists 2.5 Pro as legacy, so the cheaper price comes with a model that is no longer receiving new capability and will eventually be retired.
Is Gemini 3.1 Pro cheaper than Claude Sonnet 5?
No. Sonnet 5 runs $2 input and $10 output against $2 and $12, so they match on input and Sonnet 5 is cheaper on output. The reason to choose Gemini here is long-context handling rather than price.
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Live math against Google's current pricing plus every other provider in the roster.
Compare Gemini 3.1 Pro on my usage