GPT-5.5 vs Gemini 3.1 Pro — OpenAI vs Google Flagship
Gemini 3.1 Pro is 2.5x cheaper than GPT-5.5 across all tiers. Compare every OpenAI and Google model with our interactive calculator.
Pricing data verified: May 29, 2026
All Models Compared
Every OpenAI and Google model, ranked by input price.
| Model | Provider | Tier | Input (per 1M) | Output (per 1M) | Context |
|---|---|---|---|---|---|
| Gemini 2.0 Flash Lite | Budget | $0.075 | $0.30 | 1M | |
| Gemini 2.0 Flash | Budget | $0.10 | $0.40 | 1M | |
| GPT-5 mini | OpenAI | Budget | $0.25 | $2.00 | 272K |
| GPT-5 | OpenAI | Mid | $1.25 | $10.00 | 272K |
| Gemini 2.5 Pro | Mid | $1.25 | $10.00 | 1M | |
| Gemini 3.1 Pro | Mid | $2.00 | $12.00 | 1M | |
| GPT-5.5 | OpenAI | Premium | $5.00 | $30.00 | 1M |
| GPT-5.5 Pro | OpenAI | Premium | $30.00 | $180.00 | 1M |
Calculate Your Exact Costs
Pick your OpenAI and Google models, enter your usage, see the savings.
Which Should You Choose?
Budget Chatbot / Customer Support
High volume, short responses. Cost per message matters most. You need reliable quality at the lowest price.
Code Generation
Complex reasoning, longer outputs. Quality and accuracy matter for production code.
Long Document Analysis
Processing large documents, legal contracts, or codebases. Context window is critical.
Peak Reasoning Quality
Complex multi-step analysis, research, tasks where the absolute best quality matters most.
High-Volume Data Processing
Classification, extraction, summarization at scale. Budget is tight, volume is high.
Startup MVP / Side Project
Minimize costs while building. Need reliable API at the lowest price point.
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Frequently Asked Questions
Is Gemini 3.1 Pro cheaper than GPT-5.5?
Yes. Gemini 3.1 Pro ($2/$12 per 1M tokens) is 2.5x cheaper on input and 2.5x cheaper on output than GPT-5.5 ($5/$30). At the budget tier, Gemini 2.0 Flash ($0.10/$0.40) is 2.5x cheaper than GPT-5 mini ($0.25/$2). Google offers consistently lower prices across all model tiers.
What is the cheapest model between OpenAI and Google?
Gemini 2.0 Flash Lite at $0.075/$0.30 per 1M tokens is the cheapest option from either provider — 2x cheaper than GPT-oss 20B ($0.08/$0.35) and 3.3x cheaper than GPT-5 mini ($0.25/$2). Even Gemini 2.0 Flash ($0.10/$0.40) beats all OpenAI budget models on price while offering a 1M context window.
Can Gemini 3.1 Pro replace GPT-5.5 for production workloads?
For many use cases, yes. Gemini 3.1 Pro ($2/$12) matches or exceeds GPT-5 ($1.25/$10) on many benchmarks at a similar price point, and is 2.5x cheaper than GPT-5.5 ($5/$30). Both offer 1M context windows. Choose GPT-5.5 when you need the absolute highest reasoning quality or deep integration with the OpenAI ecosystem. For most production workloads — chat, content generation, data processing — Gemini 3.1 Pro delivers excellent value.
GPT-5 vs Gemini 3.1 Pro: which is better?
GPT-5 ($1.25/$10) and Gemini 3.1 Pro ($2/$12) are similarly priced mid-tier models. GPT-5 is slightly cheaper on input (37% less) while Gemini 3.1 Pro offers a 1M context window vs GPT-5's 272K. For most tasks, both perform comparably. Choose GPT-5 for cost-sensitive workloads; choose Gemini 3.1 Pro when you need the larger context window.
GPT-5.5 vs Gemini 3.1 Pro: which should I choose?
GPT-5.5 ($5/$30) is OpenAI's most capable model with 1M context. Gemini 3.1 Pro ($2/$12) is 2.5x cheaper with the same 1M context. For most tasks, Gemini 3.1 Pro provides excellent value. Choose GPT-5.5 only when you need peak reasoning ability, complex multi-step analysis, or deep OpenAI ecosystem integration. For code generation, summarization, and general tasks, Gemini 3.1 Pro delivers comparable quality at 40% of the cost.