Gemini 2.5 Pro vs Gemini 3.1 Flash Lite (Comparative Analysis)
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Comparative Analysis: Gemini 2.5 Pro vs. Gemini 3.1 Flash Lite
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Overview
Gemini 2.5 Pro was released 10 months before Gemini 3.1 Flash Lite.
 Gemini 2.5 Pro | Gemini 3.1 Flash Lite | |
|---|---|---|
Model Provider The organization behind this AI's development | Google | Google |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 1M tokens |
Output Token Limit Maximum output tokens this model can generate at once | 65.5K tokens | 65.5K tokens |
Release Date When this model first became publicly available | June 17, 2025 1 year ago June 17th, 2025 | May 7, 2026 2 months ago May 7th, 2026 |
Knowledge Cutoff Latest training-data date reported by the provider | January 31, 2025 | Not reported |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Gemini 2.5 Pro | Gemini 3.1 Flash Lite | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File🎵Audio🎬Video | 📝Text🖼️Image🎬Video📁File🎵Audio |
Reasoning Controls Defaults and configurable reasoning effort | Always enabled | Enabled by defaultEffort: High, Medium, Low, MinimalDefault: Minimal |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Gemini | Gemini |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
Pricing
Gemini 2.5 Pro is roughly 5.0x more expensive compared to Gemini 3.1 Flash Lite for input tokens and roughly 6.7x more expensive for output tokens.
| Gemini 2.5 Pro | Gemini 3.1 Flash Lite | |
|---|---|---|
Short Context Pricing Base rates before a long-context threshold applies | ||
Input Token Cost Cost per million input tokens | $1.25 per million tokens | $0.25 per million tokens |
Output Token Cost Cost per million output tokens | $10.00 per million tokens | $1.50 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.014 per search | $0.014 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.13 per million tokens | $0.02 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $0.38 per million tokens | $0.08 per million tokens |
Reasoning Token Cost Cost for internal reasoning tokens | $10.00 per million tokens | $1.50 per million tokens |
Image Input Cost Additional cost for each image input | $0.00000125 per image | $0.00000025 per image |
Audio Input Cost Additional cost for audio input | $0.00000125 per unit | $0.0000005 per unit |
Audio Cache Cost Cost to reuse cached audio input tokens | $0.13 per million tokens | $0.05 per million tokens |
Long Context Pricing Rates for prompts with 200,000 or more tokens | ||
Input Token Cost Long-context input cost per million tokens | $2.50 per million tokens | Not specified |
Output Token Cost Long-context output cost per million tokens | $15.00 per million tokens | Not specified |
Cache Read Cost Long-context cache read cost per million tokens | $0.25 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Gemini 2.5 Pro and Gemini 3.1 Flash Lite.
| Gemini 2.5 Pro | Gemini 3.1 Flash Lite | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 25.8 (Artificial Analysis index; higher is better) | Benchmark not available. |
Coding Index Programming performance across independent evaluations | 33.3 (Artificial Analysis index; higher is better) | Benchmark not available. |
Agentic Index Ability to complete multi-step agentic tasks | 7.1 (Artificial Analysis index; higher is better) | Benchmark not available. |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,279 Elo (#17 in Data Viz (71.8% win rate)) | Benchmark not available. |
At a Glance
Quick overview of what makes Gemini 2.5 Pro and Gemini 3.1 Flash Lite unique.
Gemini 2.5 Pro by Google understands both text and images, handles audio, analyzes video, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $1.25/M input and $10.00/M output tokens. Released June 17th, 2025.Gemini 3.1 Flash Lite by Google understands both text and images, handles audio, analyzes video, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Very affordable at $0.25/M input and $1.50/M output tokens. Released May 7th, 2026.Explore More Comparisons
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Compare Gemini 3.1 Flash Lite with:
🚀Programming
Best models for coding and development
🎨Creative & Roleplay
Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
🌐Translation
Multilingual translation tasks