Compare models
Pick up to 4. Every model here is free in free-pi.
| Attribute | GPT-6.1 Terra | Particle | GPT-OSS 120B | Solar Pro 4 |
|---|---|---|---|---|
| Maker | OpenAI | — | OpenAI | Upstage |
| Usage in free-pi | premium, uses allowance fast · ~20x usage | 🔥 Free Unlimited: limited time | ~3.0x usage | ~0.6x usage |
| Intelligence index | 51.3 (best) | — | — | 28.2 |
| Coding index | — | — | 30.4 | 52.7 (best) |
| Context window | 1,050,000 tokens (best) | — | 131,072 tokens | 524,288 tokens |
| Max output | 128,000 tokens | — | 65,536 tokens | 131,072 tokens (best) |
| Inputs | Text, image, file (best) | — | Text | Text |
| Tool calling | Yes | — | Yes | Yes |
| Reasoning effort | Yes | — | Yes | Yes |
| Structured output | Yes | — | Yes | Yes |
| Released | Oct 26, 2026 | — | Aug 5, 2025 | 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.