Gemini 3.1 Pro vs GPT-5.5
Google vs OpenAI · Prices checked 12 August 2026
There is a 2.5× price gap here. Gemini 3.1 Pro blends to $5.00 per million tokens; GPT-5.5 to $12.50. A single 100K-input, 10K-output job costs $0.320 on Gemini 3.1 Pro against $0.800 on GPT-5.5.
GPT-5.5 reads more in one request: 1,050,000 tokens of context against 1,000,000.
Pricing and capacity
| Metric | Gemini 3.1 Pro | GPT-5.5 | Difference |
|---|---|---|---|
| Input / 1M tokens | $2.00 | $5.00 | 2.5× |
| Output / 1M tokens | $12.00 | $30.00 | 2.5× |
| Blended · 70/30calculated | $5.00 | $12.50 | 2.5× |
| Blended · 50/50calculated | $7.00 | $17.50 | 2.5× |
| Blended · 80/20calculated | $4.00 | $10.00 | 2.5× |
| Blended · 20/80calculated | $10.00 | $25.00 | 2.5× |
| Job cost · 100K + 10Kcalculated | $0.320 | $0.800 | 2.5× |
| Job cost · 1M + 100Kcalculated | $3.20 | $8.00 | 2.5× |
| Context window | 1,000,000 | 1,050,000 | 5% |
Input and output rates are as published by each provider. Blended and job-cost rows are calculated comparison metrics, not published prices — how they are derived.
Benchmarks
These two models do not currently report scores on any of the same benchmark suites, so there is no like-for-like capability comparison to show. Rather than pad the page with one-sided numbers, the benchmark leaderboards list every score we do hold.
What each model is for
Gemini 3.1 Pro
Google · Frontier
A mid-cycle upgrade to Gemini 3 Pro, released after rapid iteration on feedback from the November 3 Pro launch. Google positions it for the most complex tasks, with the clearest gains in ambitious agentic workflows. Keeps the 1M-token context window and full multimodal input.
- Agentic workflow execution
- Complex multi-step reasoning
- 1M-token context
- Text, image, audio and video input
GPT-5.5
OpenAI · Frontier
Released April 2026 and positioned by OpenAI as smarter and faster for complex coding, research and data-analysis work. It shipped alongside Thinking and Pro variants, neither available on the free tier, and has a published system card.
- Complex coding and data analysis
- 1M-token context
- Thinking and Pro variants for harder work
- Published system card
Frequently asked questions
Which is cheaper, Gemini 3.1 Pro or GPT-5.5?
There is a 2.5× price gap here. Gemini 3.1 Pro blends to $5.00 per million tokens; GPT-5.5 to $12.50. A single 100K-input, 10K-output job costs $0.320 on Gemini 3.1 Pro against $0.800 on GPT-5.5. Blended cost weights input at 70% and output at 30%; price your own token split for an exact answer, since the cheaper model on a blended basis is not always cheaper for your workload.
Which has the larger context window, Gemini 3.1 Pro or GPT-5.5?
GPT-5.5 reads more in one request: 1,050,000 tokens of context against 1,000,000. The context window caps everything in a single request: prompt, retrieved documents, conversation history and the model’s own output all share it.
Can I compare Gemini 3.1 Pro and GPT-5.5 on my own numbers?
Yes. Open both in the side-by-side comparison tool to see every field at once, or use the token calculator to price your actual prompt and monthly request volume against each model. Both are free and need no sign-up.
Price it for your own workload
Related matchups
Terms used on this page
Prices and scores are recomputed on every deploy from the catalogue. Prices checked 12 August 2026.