| Feature                     | GPT-3.5         | GPT-4.0           | GPT-4.5 (Turbo)     |
|----------------------------|-----------------|-------------------|---------------------|
| Access                     | Free-tier       | API only (limited)| ChatGPT Plus & API  |
| Context Length             | 4K tokens       | 8K or 32K tokens  | 128K tokens         |
| Reasoning Accuracy         | Moderate        | High              | Very High           |
| Speed (Latency)            | Fast (Low)      | Slower (High)     | Fast (Low to Moderate) |
| Throughput                 | Moderate        | Low               | High                |
| Cost                       | Free            | Premium API       | $20/month (ChatGPT) |
| File/Image Input           | No              | Varies            | Yes                 |
| System Customization       | No              | Limited           | Yes (with memory)   |