Gemini 3.1 Pro: full review + comparison with Claude Opus 4.6 and Codex 5 3
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Gemini 3.1 Pro Review 2026 is the first 1-update to Google's Gemini 3 lineup from DeepMind that came out today. The model received a powerful upgrade **core reasoning ** and now really “thinks”, and not just continues the text.
In this article - all official updates, fresh benchmarks, detailed comparison with the top 2 models of 2026 (Claude Opus 4.6 and Codex 5.3), real examples and step-by-step launch instructions. Save the article - here is everything you need for Vibcoders.
What's New in Gemini 3.1 Pro (February 2026)
Google called it “the smartest basic model for complex tasks.” The main breakthrough is the depth of thinking and agent capabilities.
** Specifications:**
- Context: 1,000,000 tokens (all codebase, book, hour of video)
- Output: up to 64,000 tokens
- Multimodality: Text + Images + Video + Audio + Code in One Prompt
- Tools: function calling, structured output, computer use, code execution
Key benchmarks (DeepMind official data, February 19, 2026):
- ARC-AGI-2 (abstract thinking): 77.1%
- GPQA Diamond (expert science): 94.3%
- SWE-Bench Verified (real coding): 80.6%
- APEX-Agents (Long Tasks): 33.5%
- MMMU-Pro (multimodal): 80.5%
- Terminal-Bench 2.0: 68.5%
Gemini 3.1 Pro comparison with Claude Opus 4.6 and Codex 5.3 (February 2026)
An honest table of the most important metrics for Vibcoders and developers.
| Метрика | Gemini 3.1 Pro | Claude Opus 4.6 | Codex 5.3 | Победитель |
|---|---|---|---|---|
| ARC-AGI-2 (reasoning) | 77.1 % | 70.2 % | 65.4 % | Gemini 3.1 Pro |
| GPQA Diamond (наука) | 94.3 % | 92.5 % | 93.1 % | Gemini 3.1 Pro |
| SWE-Bench Verified (код) | 80.6 % | 81.2 % | 79.5 % | Claude Opus 4.6 |
| APEX-Agents (агентность) | 33.5 % | 31.0 % | 28.5 % | Gemini 3.1 Pro |
| Контекстное окно | 1 000 000 | 500 000 | 400 000 | Gemini 3.1 Pro |
| Цена Input/Output ($/M) | ~$2 / $12 | $4.5 / $18 | $3.5 / $15 | Gemini 3.1 Pro |
| Лучше всего для | Вайбкодинг + длинный контекст | Чистый сложный код | Массовый кодинг | — |
Short conclusion compared to: Gemini 3.1 Pro wins in reasoning, science, agent tasks and price. Claude Opus 4.6 remains the king of pure coding (0.6% better in SWE-Bench), and Codex 5.3 is a good wagon with more context, but inferior in depth thinking.
Why Gemini 3.1 Pro No. 1 for Vibcoding in 2026
- Catch the “vibe” of the project at a new level: the prompt “make a cyberpunk-dashboard with neon particles” → ready-made animated SVG in seconds.
- Gemini Canvas + Vibe Code is a separate mode in AI Studio.
- 1 million tokens – download the entire project and work with it as a whole.
- Improved Agents: Planning, debagging, using tools.
- Multimodality in one window.
Examples from the announcement (already working today):
- Animated SVG in the style of cyberpun k
- Real-time dashboard of the ISS orbit
- 3D simulation of a flock of starlings with hand control
- Atmospheric portfolio site in the style of "Wuthering Heights"
How to Start Using Gemini 3.1 Pro
- Go to aistudio.google.com
- Select the model gemini-3.1-pro-preview
- Enable Vibe Code or Canvas
- Write a prompt in Russian - get the ready code
** Access:**
- Free (with limits)
- Google AI Pro / Ultra is unlimited + Veo 3. 1st
- Gemini API and Vertex AI for production
Price is one of the most profitable frontier models of 2026.
Is it worth switching to Gemini 3.1 Pro?
Yes, definitely if you:
- Do if you want maximum speed from idea to prototype
- You work on big projects
- Looking for the best quality/price/intelligence ratio
Gemini 3.1 Pro overtook Claude Opus 4.6 and Codex 5.3 on most key metrics and made it even easier and more powerful to use.