| 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) |