Gemini 2.5 Flash vs GPT-5 Nano (Comparative Analysis)
Loading comparison form...
Comparative Analysis: Gemini 2.5 Flash vs. GPT-5 Nano
Want to try out these models side by side?Try Magica for free
Overview
Gemini 2.5 Flash was released 1 month before GPT-5 Nano.
 Gemini 2.5 Flash |  GPT-5 Nano | |
|---|---|---|
Model Provider The organization behind this AI's development | Google | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 65.5K tokens | 128K tokens |
Release Date When this model first became publicly available | June 17, 2025 1 year ago June 17th, 2025 | August 7, 2025 11 months ago August 7th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | January 31, 2025 | May 31, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Gemini 2.5 Flash | GPT-5 Nano | |
|---|---|---|
Input Types Supported input formats | 📁File🖼️Image📝Text🎵Audio🎬Video | 📝Text🖼️Image📁File |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Always enabledEffort: High, Medium, Low, MinimalDefault: Medium |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Gemini | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Pricing
Gemini 2.5 Flash is roughly 6.0x more expensive compared to GPT-5 Nano for input tokens and roughly 6.3x more expensive for output tokens.
| Gemini 2.5 Flash | GPT-5 Nano | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.30 per million tokens | $0.05 per million tokens |
Output Token Cost Cost per million output tokens | $2.50 per million tokens | $0.40 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.014 per search | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.03 per million tokens | $0.0050 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $0.08 per million tokens | Not specified |
Reasoning Token Cost Cost for internal reasoning tokens | $2.50 per million tokens | Not specified |
Image Input Cost Additional cost for each image input | $0.0000003 per image | Not specified |
Audio Input Cost Additional cost for audio input | $0.000001 per unit | Not specified |
Audio Cache Cost Cost to reuse cached audio input tokens | $0.10 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Gemini 2.5 Flash and GPT-5 Nano.
| Gemini 2.5 Flash | GPT-5 Nano | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,159 Elo (#67 in Data Viz (48.4% win rate)) | 1,128 Elo (#82 in Website (48.9% win rate)) |
At a Glance
Quick overview of what makes Gemini 2.5 Flash and GPT-5 Nano unique.
Gemini 2.5 Flash 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 $0.30/M input and $2.50/M output tokens. Released June 17th, 2025.GPT-5 Nano by OpenAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 400K token context window. Very affordable at $0.05/M input and $0.40/M output tokens. Includes built-in content moderation for safer outputs. Released August 7th, 2025.Explore More Comparisons
Compare your models with top performers across different categories
Compare Gemini 2.5 Flash 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
Compare GPT-5 Nano 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