Gemini 2.5 Pro vs Gemini 3.1 Pro
Compare Google and Google AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Gemini 2.5 Pro
Gemini 3.1 Pro
Cost Differences
Gemini 3.1 Pro costs more than Gemini 2.5 Pro
Feature Comparison
| Feature | Gemini 2.5 Pro | Gemini 3.1 Pro |
|---|---|---|
| Provider | ||
| Input Price | $1.25/1M tokens | $2.00/1M tokens |
| Output Price | $10.00/1M tokens | $12.00/1M tokens |
| Context Window | 2,000,000 tokens | 1,000,000 tokens |
| Max Output | 131,072 tokens | 65,536 tokens |
| Category | flagship | flagship |
| Capabilities | textvisionaudiovideocode | textvisionaudiovideocodereasoning |
| Release Date | 3/25/2025 | 2/19/2026 |
Gemini 2.5 Pro vs Gemini 3.1 Pro: Which Should You Choose?
Choosing between Gemini 2.5 Pro and Gemini 3.1 Pro depends on your priorities: cost efficiency, context length, or raw capability. Gemini 2.5 Pro is the more affordable option at $1.25/1M input tokens — 38% cheaper than Gemini 3.1 Pro. Meanwhile, Gemini 2.5 Pro offers a significantly larger context window at 2,000,000 tokens vs 1,000,000 for Gemini 3.1 Pro.
Both models are in the flagship category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: Gemini 2.5 Pro would save you roughly $525.00/month compared to Gemini 3.1 Pro. For startups and indie developers, that difference can be significant.
Output costs matter too. Gemini 2.5 Pro charges $10.00/1M output tokens vs $12.00 for Gemini 3.1 Pro. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Gemini 2.5 Pro has the edge here at $10.00/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose Gemini 2.5 Pro when:
- • Budget is a primary concern
- • You need a larger context window (2,000,000 tokens)
- • You need longer outputs (up to 131,072 tokens)
- • You're already using Google's API ecosystem
Choose Gemini 3.1 Pro when:
- • You need more capabilities (reasoning)
- • You're already using Google's API ecosystem
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Gemini 2.5 Pro (Google)
Gemini 3.1 Pro (Google)
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