Gemini 3.1 Pro pricing in 2026
What one task costs on Gemini 3.1 Pro
Per-million-token prices are hard to feel, so here are typical token counts for common jobs priced with Gemini 3.1 Pro. Figures are USD at the rates above and exclude prompt caching and batch discounts.
| Task | Tokens (in / out) | Cost |
|---|---|---|
| Code review of a 500-line pull request | 60,000 / 4,000 | $0.168 |
| Debug one failing test | 40,000 / 6,000 | $0.152 |
| Generate a landing page in one shot | 3,000 / 30,000 | $0.366 |
| Draft a 1,200-word article | 2,000 / 2,500 | $0.034 |
| Answer a question from a 20-page document | 25,000 / 800 | $0.060 |
| Multi-step agent run (10 tool calls) | 250,000 / 25,000 | $0.800 |
| All of the above, once | $1.58 |
Cheaper at the same or better capability: GLM-5.3 Flash runs the same set of tasks for $0.091 instead of $1.58.
Gemini 3.1 Pro by Google costs $2 per 1M input tokens and $12 per 1M output tokens — about 105.3k tokens per $1. Prices last verified 2026-09-19.
The verdict
Google's frontier default, with a 1M-token context and an index of 30 at $2 / $12. The Flash generation has since leapfrogged it — Gemini 3.7 Flash is cheaper and higher-indexed — so 3.1 Pro now mainly matters for teams that need the Pro tier specifically.
A concrete example: sending 100,000 input tokens and getting back 20,000 output tokens with Gemini 3.1 Pro costs about $0.44 at current prices.
Who is Gemini 3.1 Pro for?
Gemini 3.1 Pro is Google's frontier tier — a 1M-token context and an index of 30 at $2 / $12 per 1M. It's a solid, reliable Pro option.
The honest caveat is that Google's own Flash line has since leapfrogged it: 3.7 and 3.8 Flash are both cheaper and higher-indexed. Choose 3.1 Pro mainly if you specifically need the Pro tier or a proven, stable integration; otherwise 3.8 Flash is the smarter buy.
Strengths & weaknesses
- Strength: Google's frontier tier
- Weakness: Outdated — a February release that Google's newer Flash models have leapfrogged (Gemini 3.5 Pro never shipped).
Gemini 3.1 Pro key facts
| Provider | Gemini pricing |
|---|---|
| Input price | $2 / 1M tokens |
| Output price | $12 / 1M tokens |
| Tokens / $1 | 105.3k |
| Intelligence / $1 | 31,579 |
| Context window | 1.0M tokens |
| Tier | frontier |
| Speed | Slow |
| Intelligence index | 30 / 100 |
| Released | 2026-02-19 |
| Last verified | 2026-09-19 |
What Gemini 3.1 Pro delivers for your budget
For a coding workload, here is roughly what each monthly budget buys:
| Budget | Tokens / month | Months of workload |
|---|---|---|
| $20 | 4.6M | 7.1x |
| $50 | 11.6M | 17.9x |
| $100 | 23.2M | 35.7x |
Other Gemini models
How Gemini 3.1 Pro compares to its closest rivals
Rather than repeating the full catalog on every page, here are the three current models nearest to Gemini 3.1 Pro on the intelligence index — and why you might still pick one instead:
- DeepSeek V4 Pro (DeepSeek) — $0.66 input / $1.98 output per 1M tokens. Why you might pick it: Unbeatable frontier value.
- GPT-5.6 Luna (ChatGPT) — $0.20 input / $1.20 output per 1M tokens. Why you might pick it: ChatGPT quality at a budget price.
- Claude Sonnet 5 (Claude) — $2 input / $10 output per 1M tokens. Why you might pick it: Strong coding at mid-tier price.
Gemini 3.1 Pro — frequently asked questions
How much does Gemini 3.1 Pro cost?
Gemini 3.1 Pro by Google costs $2 per 1M input tokens and $12 per 1M output tokens.
How many tokens per dollar does Gemini 3.1 Pro give you?
On a typical 1:3 input-to-output mix, Gemini 3.1 Pro delivers around 105.3k tokens per dollar — an intelligence-per-dollar score of 31579.
What is Gemini 3.1 Pro's context window?
Gemini 3.1 Pro supports a context window of 1.0M tokens.
Is Gemini 3.1 Pro worth it in 2026?
Gemini 3.1 Pro is Gemini's frontier tier model. Use the AI Intelligence Calculator to see how its value compares to every other model at your budget.