Key Takeaways
Gemini 2.5 Flash wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
- Has reasoning mode
GPT-4o wins:
- No clear advantages in compared metrics
Price Advantage
Gemini 2.5 Flash
Benchmark Advantage
Gemini 2.5 Flash
Context Window
Gemini 2.5 Flash
Speed
Gemini 2.5 Flash
Pricing Comparison
Price Comparison
| Metric | Gemini 2.5 Flash | GPT-4o | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.30 | $2.50 | Gemini 2.5 Flash |
| Output (per 1M tokens) | $2.50 | $10.00 | Gemini 2.5 Flash |
| Cache Read (per 1M) | $0.03 | $1.25 | Gemini 2.5 Flash |
| Cache Write (per 1M) | $0.08 | N/A | Gemini 2.5 Flash |
Using a 3:1 input/output ratio, Gemini 2.5 Flash is 81% cheaper overall.
Gemini 2.5 Flash Providers
Vercel $0.30 (Cheapest)
Google AI Studio $0.30 (Cheapest)
Google $0.30 (Cheapest)
GPT-4o Providers
OpenAI $2.50 (Cheapest)
Vercel $2.50 (Cheapest)
Azure $2.50 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
5
Gemini 2.5 Flash Wins
1
GPT-4o Wins
Benchmark Scores
| Benchmark | Gemini 2.5 Flash | GPT-4o | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 21.1 | 15.6 | |
Coding Index Code generation & understanding | 17.8 | 16.6 | |
Math Index Mathematical reasoning | 60.3 | - | - |
MMLU Pro Academic knowledge | 80.9 | - | - |
GPQA Graduate-level science | 68.3 | 52.1 | |
LiveCodeBench Competitive programming | 49.5 | 31.7 | |
Aider Real-world code editing | 55.1 | 74.4 | |
AIME Competition math | 50.0 | 11.7 |
Gemini 2.5 Flash shows stronger mathematical reasoning abilities.
Cost vs Quality
X-axis:
Y-axis:
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Gemini 2.5 Flash
Other models
Context & Performance
Context Window
Gemini 2.5 Flash
1,048,576
tokens
Max output: 65,535 tokens
GPT-4o
128,000
tokens
Max output: 16,384 tokens
Gemini 2.5 Flash has a 88% larger context window.
Speed Performance
| Metric | Gemini 2.5 Flash | GPT-4o | Winner |
|---|---|---|---|
| Tokens/second | 246.2 tok/s | 86.1 tok/s | |
| Time to First Token | 0.47s | 0.58s |
Gemini 2.5 Flash responds 186% faster on average.
Capabilities
Feature Comparison
| Feature | Gemini 2.5 Flash | GPT-4o |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Gemini 2.5 Flash | GPT-4o |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | |
| Released | Jun 2025 | May 2024 |
Gemini 2.5 Flash Modalities
Input
fileimagetextaudiovideo
Output
text
GPT-4o Modalities
Input
textimagefile
Output
text