Compare models
Pick up to 4. Every model here is free in free-pi.
| Attribute | GLM 5.3 Flash | GPT-6.1 Sol Flex | Particle | Solar Pro 4 |
|---|---|---|---|---|
| Maker | Z.ai | OpenAI | — | Upstage |
| Usage in free-pi | 🔥 Free Unlimited: limited time | slower · ~41x usage | 🔥 Free Unlimited: limited time | ~0.6x usage |
| Intelligence index | 27.8 | 54.6 (best) | — | 28.2 |
| Coding index | 71.5 (best) | — | — | 52.7 |
| Context window | 1,048,576 tokens | 1,050,000 tokens (best) | — | 524,288 tokens |
| Max output | 943,717 tokens (best) | 128,000 tokens | — | 131,072 tokens |
| Inputs | Text, image, video (best) | Text, image, file (best) | — | Text |
| Tool calling | Yes | Yes | — | Yes |
| Reasoning effort | Yes | Yes | — | Yes |
| Structured output | Yes | Yes | — | Yes |
| Released | Aug 26, 2026 | Sep 29, 2026 | — | Aug 10, 2026 |
| Model page | Model page | Model page | Model page | Model page |
Stats refreshed automatically. Usage rate from free-pi. Green marks the best value in each row. “—” means no figure is available.