Gemini 3.1 Pro is Google’s latest “Pro” model in preview, positioned as a stronger baseline for complex problem‑solving. Google and third‑party reports highlight major gains on reasoning benchmarks such as ARC‑AGI‑2, and broader improvements across coding and multimodal tasks. Availability spans the Gemini app and developer platforms, with performance still varying by use case.

Google is moving quickly on its Gemini roadmap — and the latest change is aimed at a specific pain point: reliability on multi-step reasoning tasks.

In February 2026, Google announced Gemini 3.1 Pro in preview, describing it as a smarter baseline for complex problem-solving and agentic-style work. Alongside that announcement, Google and third-party reporting highlighted benchmark improvements — including a headline gain on ARC‑AGI‑2, a reasoning test designed to stress generalisation and abstract problem‑solving.

Benchmarks aren’t the whole story, though. This guide unpacks what’s been shared, where you can access 3.1 Pro, and how to interpret the numbers without getting misled.

What is Gemini 3.1 Pro?

Gemini 3.1 Pro is an upgraded “Pro” model that Google positions for complex tasks: multi-step analysis, coding, long-form synthesis, and richer multimodal reasoning.

It’s being rolled out as a preview model, which usually means:

• features and behaviour may shift quickly

• the model can improve (or regress) as safety, reliability, and latency trade-offs are tuned

• availability expands in phases across products and regions

The benchmark story (what’s being claimed)

ARC‑AGI‑2: the headline metric

Coverage of the release points to a 77.1% score on ARC‑AGI‑2, described as more than double the predecessor’s performance.

Why that matters: ARC-style benchmarks are less about memorising facts and more about reasoning over unfamiliar patterns — the thing most users notice when an assistant “can’t keep the thread” over multiple steps.

Beyond ARC: what else improved?

Google’s own messaging and third‑party write-ups also suggest improvements across:

• coding and structured problem-solving

• tool use / agentic behaviours (planning, iterating)

• multimodal tasks (working with visual inputs)

But be careful: different sources may cite different benchmark suites. The reliable takeaway is directional: Google is optimising 3.1 Pro for reasoning and complex workflows.

How to try Gemini 3.1 Pro

Based on Google’s announcement and third‑party reporting, Gemini 3.1 Pro is available through:

• the Gemini app (consumer access varies by plan and region)

• Google’s developer tooling (for building and testing integrations)

• related Google AI surfaces where “Pro” models are offered (often including Notebook-style products)

If you’re testing for work, treat it like any model evaluation:

1. define 10–20 representative tasks (support, analytics, coding, summarisation, policy Q&A)

2. run side-by-side comparisons with your current baseline

3. track outcomes: time-to-correct answer, hallucination rate, and user satisfaction

What benchmarks don’t tell you (and what you should test instead)

Benchmarks are useful, but they can mislead if you treat them as a purchasing decision.

Here are the practical checks that matter more for teams:

1) “Does it stay reliable over long chains?”

Ask the model to plan, execute, and verify. Look for self-consistency and error recovery.

2) “Does it know when to stop?”

A better reasoner should also be better at refusing to guess when evidence is missing.

3) “Does it follow constraints?”

Test policy adherence: formats, required citations, and tool-use boundaries.

4) “How does it behave under ambiguity?”

Real work is messy. Give incomplete requirements and check whether it asks sensible questions or invents details.

So, is Gemini 3.1 Pro ‘better’?

If your daily tasks are technical, structured, and multi-step, 3.1 Pro’s positioning suggests you’ll likely see improvements — especially in reasoning-heavy workflows.

But early user feedback in the broader ecosystem often shows trade-offs: models can improve at reasoning while feeling less “human” in tone or creativity, depending on how they’re tuned.

The right approach is to evaluate against your use cases, not just leaderboards.

Where Generation Digital helps

If you’re adopting multiple models across teams, you need more than headline benchmarks. You need:

• a repeatable evaluation framework

• governance guardrails (risk, privacy, compliance)

• a clear operating model for safe rollout

Generation Digital helps organisations build that layer so model upgrades translate into measurable outcomes.

Summary

Gemini 3.1 Pro is Google’s latest Pro model in preview, positioned for complex problem-solving with a headline jump on reasoning benchmarks such as ARC‑AGI‑2. While benchmark scores are encouraging, teams should validate performance on their own tasks — especially reliability, constraint following, and tool-use safety — before standardising a rollout.

Next steps

1. Identify the workflows where reasoning gains matter most (analytics, coding, research, support).

2. Build a 2‑week test plan with measurable success criteria.

3. Evaluate reliability and safety behaviour alongside raw capability.

4. If you want help building an evaluation and rollout framework, contact Generation Digital.

FAQs

Q1: What is Gemini 3.1 Pro?
A: Gemini 3.1 Pro is Google’s latest “Pro” model in preview, designed for complex tasks such as multi-step reasoning, coding, and long-form synthesis.

Q2: What benchmarks improved for Gemini 3.1 Pro?
A: Reporting highlights a major jump on the ARC‑AGI‑2 reasoning benchmark, alongside broader improvements across complex problem-solving and technical tasks.

Q3: How can I try Gemini 3.1 Pro?
A: Availability is via Google’s Gemini app and Google’s developer platforms where Gemini models are offered, with access varying by plan and region.

Q4: Should I choose a model based on benchmarks alone?
A: No. Benchmarks are useful signals, but you should test on your own workflows, focusing on reliability, constraint following, and safety behaviour.

Q5: What should enterprises test before rollout?
A: Long-chain reliability, refusal/uncertainty handling, policy adherence, tool-use boundaries, latency, and total cost of ownership.