Google Gemini vs OpenAI GPT: Complete Comparison 2026
Compare Google Gemini 3.1/2.5 models with OpenAI GPT-5.6 Sol/Terra/Luna. Pricing, context windows, and performance across different use cases.
Last updated: July 2026
Pricing Comparison
| Model | Provider | Input $/1M | Output $/1M | Context | Max Output |
|---|---|---|---|---|---|
| Gemini 3.1 Pro | $2 | $12 | 1.05M | 65K | |
| GPT-5.6 Sol | OpenAI | $5 | $30 | 1.05M | 128K |
| Gemini 2.5 Flash | $0.3 | $2.5 | 1M | 65K | |
| GPT-5.6 Terra | OpenAI | $2.5 | $15 | 1.05M | 128K |
Detailed Comparison
Gemini 3.1 Pro
$2 / $12
per 1M tokens
Strengths
- + Large 1.05M context window
- + Lower input price than GPT-5.6 Sol
- + Strong Google flagship reasoning model
Best For
Long document analysis, cost-effective premium tasks
Context Window
1.05M
Max Output
65K
GPT-5.6 Sol
OpenAI
$5 / $30
per 1M tokens
Strengths
- + Broader ecosystem support
- + More mature API and tooling
- + Strong multi-modal capabilities
Best For
Enterprise applications, broad integration needs
Context Window
1.05M
Max Output
128K
Gemini 2.5 Flash
$0.3 / $2.5
per 1M tokens
Strengths
- + Extremely cost-effective
- + 1M context at flash speed
- + Great for high-volume processing
Best For
High-volume tasks, budget-conscious applications
Context Window
1M
Max Output
65K
GPT-5.6 Terra
OpenAI
$2.5 / $15
per 1M tokens
Strengths
- + Large 1.05M context window
- + Good balance of price and quality
- + Reliable for production
Best For
Production workloads needing large context
Context Window
1.05M
Max Output
128K
Verdict
Gemini 3.1 Pro offers a 1.05M-token context window at $2/$12, while GPT-5.6 Sol is the premium OpenAI option at $5/$30. GPT-5.6 Terra and Luna add lower-cost OpenAI routes. Choose Gemini for large-context cost savings; choose GPT for ecosystem maturity and OpenAI integration fit.
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FAQ
Which is cheaper, Gemini 3.1 Pro or GPT-5.6 Sol?
Gemini 3.1 Pro costs $2/$12 per million tokens (input/output), while GPT-5.6 Sol costs $5/$30. Gemini 3.1 Pro is cheaper for input.
Which has a larger context window?
Gemini 3.1 Pro supports 1.05M context, while GPT-5.6 Sol supports 1.05M. Larger context windows allow processing more text in a single request.
Which should I choose for my project?
Gemini 3.1 Pro offers a 1.05M-token context window at $2/$12, while GPT-5.6 Sol is the premium OpenAI option at $5/$30. GPT-5.6 Terra and Luna add lower-cost OpenAI routes. Choose Gemini for large-context cost savings; choose GPT for ecosystem maturity and OpenAI integration fit.