Compare models
Pick up to 4. Every model here is free in free-pi.
| Attribute | GPT-6.1 Sol Flex | Particle | GPT-6.1 Terra | Claude Haiku 5.5 |
|---|---|---|---|---|
| Maker | OpenAI | — | OpenAI | Anthropic |
| Usage in free-pi | slower · ~41x usage | 🔥 Free Unlimited: limited time | premium, uses allowance fast · ~20x usage | ~2.0x usage |
| Intelligence index | 54.6 (best) | — | 51.3 | 36.5 |
| Coding index | — | — | — | — |
| Context window | 1,050,000 tokens (best) | — | 1,050,000 tokens (best) | 1,000,000 tokens |
| Max output | 128,000 tokens (best) | — | 128,000 tokens (best) | 128,000 tokens (best) |
| Inputs | Text, image, file (best) | — | Text, image, file (best) | Text, image, file (best) |
| Tool calling | Yes | — | Yes | Yes |
| Reasoning effort | Yes | — | Yes | Yes |
| Structured output | Yes | — | Yes | Yes |
| Released | Sep 29, 2026 | — | Oct 26, 2026 | Oct 7, 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.