Stronger real-world coding
Google highlights gains on SWE and real engineering scenarios versus 3 Pro Preview—suited to complex repos and multi-step fixes.
Google · Gemini 3.1 Pro · Feb 2026
Gemini 3.1 Pro — a native multimodal model for complex reasoning and coding
- Million-token context
- Image, text, audio & video
- Adjustable thinking depth
- More reliable tool orchestration
What is Gemini 3.1 Pro?
Gemini 3.1 Pro is Google’s higher-capability Gemini 3 model from February 2026. It’s built for work that needs image, text, audio, and video in the same reasoning pass—and for multi-file coding plus multi-step tool orchestration. Versus Gemini 3 Pro Preview, real-world coding and tool reliability improve, with a medium thinking depth added. For high-turnaround everyday coding, compare Gemini 3.6 Flash. On iMini Agent, pick Gemini 3.1 Pro to use it.
- Vendor
- Released
- Feb 2026
- Context
- 1M tokens
- Max output
- 65K tokens
- Deep thinking
- Includes medium · adjustable
- Best for
- Hard multimodal work & heavy coding
What’s new versus Gemini 3 Pro Preview
Real-world coding, agent reliability, and thinking levels—the changes to check before treating it as your Pro pick.
More reliable agent orchestration
Tool calls and multi-step workflows hold up better—suited to finishing long jobs in one thread.
Finer thinking depth
Adds a medium thinking level so you can sit between speed and depth.
More complete multimodal reasoning
Text, images, video, audio, and code materials can enter the same reasoning process—suited to complex delivery.
Official evaluations
The evaluation scoreboard Google DeepMind published on the Gemini 3.1 Pro product page, shown against Gemini 3 Pro, Claude Sonnet 4.6, Claude Opus 4.6, GPT-5.2, and peers.
Three common workflows
Gemini 3.1 Pro fits complex work that needs the Pro ceiling.
Complex agent coding
For multi-file changes, hard-to-reproduce bugs, and tool orchestration. A strong Pro pick on the Google stack.
Multimodal professional analysis
For conclusions that pull in charts, video clips, and long docs. Cite evidence and hard constraints.
Long-context decision memos
For collapsing million-token materials into one page you can decide on: options, recommendation, and risks.
How to choose vs Gemini 3.6 Flash and Claude Opus 5
All three are modern primary picks. The gap is mainly product stack, Flash vs Pro ceiling, and which jobs you run most.
| Criterion | Gemini 3.1 Pro | Gemini 3.6 Flash | Claude Opus 5 |
|---|---|---|---|
| Context | 1M tokens | 1M tokens | 1M tokens |
| Reasoning | Pro thinking, adjustable | Flash thinking, adjustable | Built-in deep thinking, adjustable |
| Coding & agents | Google-stack Pro coding & orchestration | High-turnaround Flash coding | Long-horizon coding as a daily flagship |
| Long-horizon tools | Favors reliability & orchestration | High-turnaround loops | Stronger goal holding & completion |
| Speed posture | Favors precision | Faster and leaner | Favors finish quality |
| Prefer when | Hard work on the Google stack | High-frequency Flash work on Google | Long-horizon work on the Claude stack |
Using Gemini 3.1 Pro on iMini
Free quota, model naming, key specs, and how it differs from Flash and Claude.
Use Gemini 3.1 Pro free on iMini Agent
Million-token context; image, text, audio, and video in—suited to heavy coding and tool orchestration.
Open Gemini 3.1 ProNo Google API key required.