Compare models
Pick up to 4. Every model here is free in free-pi.
| Attribute | Particle | Solar Pro 4 | GPT-6.1 Terra Flex | Qwen3.5 35B |
|---|---|---|---|---|
| Maker | — | Upstage | OpenAI | — |
| Usage in free-pi | 🔥 Free Unlimited: limited time | ~0.6x usage | slower · ~20x usage | ~2.9x usage |
| Intelligence index | — | 28.2 | 51.3 (best) | — |
| Coding index | — | 52.7 | — | — |
| Context window | — | 524,288 tokens | 1,050,000 tokens (best) | — |
| Max output | — | 131,072 tokens (best) | 128,000 tokens | — |
| Inputs | — | Text | Text, image, file (best) | — |
| Tool calling | — | Yes | Yes | — |
| Reasoning effort | — | Yes | Yes | — |
| Structured output | — | Yes | Yes | — |
| Released | — | Aug 10, 2026 | Oct 26, 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.