Compare models
Pick up to 4. Every model here is free in free-pi.
| Attribute | GLM 5.3 Flash | Muse Spark Open (Meta) | GPT-6.1 Terra Flex | Particle |
|---|---|---|---|---|
| Maker | Z.ai | Meta | OpenAI | — |
| Usage in free-pi | 🔥 Free Unlimited: limited time | premium, uses allowance fast · ~25x usage | slower · ~20x usage | 🔥 Free Unlimited: limited time |
| Intelligence index | 27.8 | 24.9 | 51.3 (best) | — |
| Coding index | 71.5 | — | — | — |
| Context window | 1,048,576 tokens | 1,048,576 tokens | 1,050,000 tokens (best) | — |
| Max output | 943,717 tokens | 943,718 tokens (best) | 128,000 tokens | — |
| Inputs | Text, image, video | Text, image, file, audio, video (best) | Text, image, file | — |
| Tool calling | Yes | Yes | Yes | — |
| Reasoning effort | Yes | Yes | Yes | — |
| Structured output | Yes | Yes | Yes | — |
| Released | Aug 26, 2026 | Oct 15, 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.