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Pick up to 4. Every model here is free in free-pi.
Claude Sonnet 5.5 Defense Flash 2 GPT-6 Luna Flex
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| Claude Sonnet 5.5 | Defense Flash 2 | GPT-6 Luna Flex | |
|---|---|---|---|
| Maker | Anthropic | — | OpenAI |
| Usage in free-pi | premium, uses allowance fast · ~41x usage | ~20x usage | slower, half price · ~1x usage |
| Intelligence index | 56 (best) | — | 38.1 |
| Coding index | — | — | — |
| Context window | 1,000,000 tokens | — | 1,050,000 tokens (best) |
| Max output | 128,000 tokens (best) | — | 128,000 tokens (best) |
| Inputs | Text, image, file (best) | — | Text, image, file (best) |
| Tool calling | Yes | — | Yes |
| Reasoning effort | Yes | — | Yes |
| Structured output | Yes | — | Yes |
| Released | Sep 28, 2026 | — | Sep 22, 2026 |
| Model page | Model page | Model page | Model page |
Stats from OpenRouter; refreshed automatically. Usage rate from free-pi. Green marks the best value in each row. “—” means no figure is available.