GPT-5.4 vs Gemini 3.1 Pro: Full Comparison & Benchmark Tests

Quick Verdict

Gemini 3.1 Pro leads more benchmarks (13 out of 16) and costs less on the API. GPT-5.4 has better computer use, stronger image generation, and a more mature plugin ecosystem. They're tied on the Intelligence Index at 57. Your choice comes down to whether you value raw benchmark performance or practical features.

Side-by-Side Comparison

Feature	GPT-5.4	Gemini 3.1 Pro
Release date	March 5, 2026	February 19, 2026
Context window	1M (272K standard)	1M
GPQA Diamond	84.2%	94.3%
ARC-AGI-2	N/A	77.1%
SWE-bench Verified	74.9%	80.6%
AIME 2025	100%	N/A
Output speed	Moderate	120.4 t/s
Image generation	GPT Image 1.5 (Elo 1266)	Yes + animated SVGs
Computer use	Native	Limited
API (input/output)	$2.50/$15	$2/$12
Subscription	$20/mo (Plus)	$19.99/mo (Pro)
Intelligence Index	57	57

Benchmark Performance

Gemini 3.1 Pro has a clear lead on paper. Its 94.3% on GPQA Diamond is 10 points above GPT-5.4's 84.2%. On ARC-AGI-2, Gemini scores 77.1%. On SWE-bench Verified, Gemini edges out GPT-5.4 by about 6 points (80.6% vs 74.9%). The one area where GPT-5.4 wins decisively is math: a perfect 100% on AIME 2025. Google's three-tier thinking system in Gemini seems to be paying off on harder reasoning tasks.

Speed

This isn't close. Gemini 3.1 Pro outputs at 120.4 tokens per second. GPT-5.4 is noticeably slower. If you're building applications that need fast responses, or you're processing thousands of API calls, Gemini's speed advantage translates directly to better user experience and lower latency costs.

Coding

Gemini 3.1 Pro's 80.6% on SWE-bench Verified is strong. I tested both on a backend task: building a REST API with authentication, pagination, and error handling. Gemini produced well-structured code quickly. GPT-5.4's code worked but needed a couple of fixes. That said, GPT-5.4 has Tool Search with a 47% token reduction, which makes complex coding sessions more efficient. For pure code quality, Gemini wins. For interactive coding sessions, GPT-5.4's tooling is more mature.

Computer Use and Agents

GPT-5.4 has native computer use that actually works reliably. I used it to navigate web apps, fill forms, and automate desktop tasks. Gemini has some agent capabilities but they're limited compared to GPT-5.4. If desktop automation is part of your workflow, GPT-5.4 is the clear choice.

Image Generation

Both can generate images, but GPT Image 1.5 has a higher Elo rating (1266) and produces more photorealistic results. Gemini 3.1 Pro has a unique trick though: it can generate animated SVGs, which is useful for diagrams, UI mockups, and presentations. Different strengths for different needs.

Pricing

Gemini is cheaper across the board. API pricing is $2/$12 versus $2.50/$15 for GPT-5.4. Consumer subscriptions are within a dollar of each other. Google's Ultra plan ($249.99/mo) is pricier than OpenAI's Pro ($200/mo), but for most users the standard plans are what matter. If you'd rather not commit to either, Admix offers both models plus more starting at $10/month (or $8/month billed annually).

Which Should You Choose?

Pick Gemini 3.1 Pro for: benchmark-leading performance, faster output, cheaper API costs, and animated SVG generation. Pick GPT-5.4 for: computer use, a more mature ecosystem, stronger math performance, and better image generation quality. Or use Admix to access both and switch based on the task.

FAQ

Is Gemini 3.1 Pro really better than GPT-5.4?

On benchmarks, yes. Gemini leads 13 of 16 standard benchmarks. But GPT-5.4 has stronger practical features like native computer use and better image generation. It depends on what "better" means for your workflow.

Which is cheaper?

Gemini is cheaper on the API ($2/$12 vs $2.50/$15). Subscriptions are nearly identical at ~$20/month. The best value is Admix at $10/month (or $8/month billed annually) for both plus 350+ AI models.