Key Takeaways
Gemini 3 Pro Preview wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
- Supports vision
- Has reasoning mode
- Supports tool calls
Step 3.5 Flash wins:
- Cheaper input tokens
- Cheaper output tokens
Price Advantage
Step 3.5 Flash
Benchmark Advantage
Gemini 3 Pro Preview
Context Window
Gemini 3 Pro Preview
Speed
Gemini 3 Pro Preview
Pricing Comparison
Price Comparison
| Metric | Gemini 3 Pro Preview | Step 3.5 Flash | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $2.00 | $0.10 | Step 3.5 Flash |
| Output (per 1M tokens) | $12.00 | $0.30 | Step 3.5 Flash |
| Cache Read (per 1M) | $200000.00 | $20000.00 | Step 3.5 Flash |
| Cache Write (per 1M) | $375000.00 | N/A | Gemini 3 Pro Preview |
Using a 3:1 input/output ratio, Step 3.5 Flash is 97% cheaper overall.
Gemini 3 Pro Preview Providers
Google AI Studio $2.00 (Cheapest)
Google $2.00 (Cheapest)
Step 3.5 Flash Providers
No provider data available
Benchmark Comparison
6
Benchmarks Compared
0
Gemini 3 Pro Preview Wins
0
Step 3.5 Flash Wins
Benchmark Scores
| Benchmark | Gemini 3 Pro Preview | Step 3.5 Flash | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 48.4 | - | - |
Coding Index Code generation & understanding | 46.5 | - | - |
Math Index Mathematical reasoning | 95.7 | - | - |
MMLU Pro Academic knowledge | 89.8 | - | - |
GPQA Graduate-level science | 90.8 | - | - |
LiveCodeBench Competitive programming | 91.7 | - | - |
Gemini 3 Pro Preview significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Gemini 3 Pro Preview
Other models
Context & Performance
Context Window
Gemini 3 Pro Preview
1,048,576
tokens
Max output: 65,536 tokens
Step 3.5 Flash
256,000
tokens
Max output: 256,000 tokens
Gemini 3 Pro Preview has a 76% larger context window.
Speed Performance
| Metric | Gemini 3 Pro Preview | Step 3.5 Flash | Winner |
|---|---|---|---|
| Tokens/second | 130.1 tok/s | N/A | |
| Time to First Token | 31.81s | N/A |
Capabilities
Feature Comparison
| Feature | Gemini 3 Pro Preview | Step 3.5 Flash |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Gemini 3 Pro Preview | Step 3.5 Flash |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Stepfun-ai | |
| Released | Nov 2025 | Jan 2026 |
Gemini 3 Pro Preview Modalities
Input
textimagefileaudiovideo
Output
text
Step 3.5 Flash Modalities
Input
text
Output
text