Gemini 3.1 Pro
Chat model · Google ·
Gemini 3.1 Pro is a chat model by Google. In Endless it costs 243 credits per 1M input tokens and 1215 per 1M output tokens, on every plan.
Gemini 3.1 Pro is Google's Pro-tier reasoning model for complex problems, built to read long documents, images and data and answer with care.
- Price
- 243 credits per 1M input tokens
- 1215 credits per 1M output tokens
- Availability
- Available on every plan
- Context window
- 1M tokens
- Max output
- 65,536 tokens
- Outputs
- Text
About Gemini 3.1 Pro
Gemini 3.1 Pro is the Pro model of Google's Gemini 3 family, aimed at complex problem-solving and agentic work. It refines the Gemini 3 Pro series with stronger reasoning, better token efficiency and more factually consistent answers. It takes text, images, video, audio and PDFs, holds about 1M tokens of input and returns up to 65,536 tokens, enough for a full report in one reply.
Teams use it when the material is long and the answer has to hold up: reviewing a contract set for conflicting clauses, reading a quarterly report next to its spreadsheets, checking a research paper's method against its figures, or working through a hard technical design question. It is slower than the Flash models, and that extra time goes into thinking through the problem.
Next to it in Endless chat sit Gemini 3.8 Flash and Gemini 3.6 Flash. Flash models answer faster and suit coding loops and everyday questions, while 3.1 Pro fits the requests where depth matters more than speed. You can switch to it mid-project in the same workspace when a question outgrows a Flash model.
Best for
- Reviewing long contracts, reports and research papers
- Analyzing data tables and charts alongside the source text
- Hard technical and design questions with many constraints
- Writing long, structured reports from many sources
Questions about Gemini 3.1 Pro
- What is Gemini 3.1 Pro?
- Gemini 3.1 Pro is a chat model by Google.
- Is Gemini 3.1 Pro free?
- You can try Gemini 3.1 Pro for free. It is on every Endless plan, including Free, which gives you 100 credits when you create a workspace and 50 credits every week. Each run spends credits from that balance.
- How much does Gemini 3.1 Pro cost?
- In Endless it costs 243 credits per 1M input tokens and 1215 per 1M output tokens, on every plan.
- How do I use Gemini 3.1 Pro?
- Start a chat in your Endless workspace and choose Gemini 3.1 Pro in the model picker. Endless can also pick the best model for each message on its own.
- What are the alternatives to Gemini 3.1 Pro?
- Similar models you can use in Endless include Gemini 3.8 Flash, Gemini 3.6 Flash, and GPT-6.1 Sol. Each one has its own page with its price and plan.
- What is the difference between Gemini 3.1 Pro and Gemini 3.8 Flash?
- Gemini 3.1 Pro is the Pro-tier model for deep reasoning over complex, long material. Gemini 3.8 Flash is faster and tuned for coding and agent work at Flash speed, so it suits quicker loops.
- How long a document can Gemini 3.1 Pro read?
- It accepts up to 1,048,576 input tokens, which covers hundreds of pages of text in one request. It can write up to 65,536 tokens in a single answer.
- When was Gemini 3.1 Pro released?
- Google released Gemini 3.1 Pro on February 19, 2026, as an upgrade to Gemini 3 Pro.
How to use Gemini 3.1 Pro in Endless
- 01
Open a chat
Start a chat in your workspace and choose Gemini 3.1 Pro in the model picker.
- 02
Bring your context
Attach files, mention a project with @, or ask it to search the web and social media.
- 03
Turn answers into work
Generate images and video, write documents and save what matters to a project.
Related models
Gemini 3.8 Flash
by Google
Agentic coding and multi-step reasoning at Flash speed
121.5 / 607.5 credits per 1M tokens
Gemini 3.6 Flash
by Google
Quick answers on text, images and video for everyday work
121.5 / 607.5 credits per 1M tokens
GPT-6.1 Sol
by OpenAI
Near-flagship agentic coding and professional work at lower cost
162 / 810 credits per 1M tokens
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