Compare models
Pick up to 4. Every model here is free in free-pi.
| Attribute | GPT-6.1 Sol Flex | Solar Pro 4 | Uncensored 1.2 | Particle |
|---|---|---|---|---|
| Maker | OpenAI | Upstage | — | — |
| Usage in free-pi | slower · ~41x usage | ~0.6x usage | ~20x usage | 🔥 Free Unlimited: limited time |
| Intelligence index | 54.6 (best) | 28.2 | — | — |
| Coding index | — | 52.7 | — | — |
| Context window | 1,050,000 tokens (best) | 524,288 tokens | — | — |
| Max output | 128,000 tokens | 131,072 tokens (best) | — | — |
| Inputs | Text, image, file (best) | Text | — | — |
| Tool calling | Yes | Yes | — | — |
| Reasoning effort | Yes | Yes | — | — |
| Structured output | Yes | Yes | — | — |
| Released | 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.