Compare models
Pick up to 4. Every model here is free in free-pi.
| Claude Sonnet 5.5 | Defense Flash | DeepSeek V4.1 Flash | DeepSeek V4 Pro | |
|---|---|---|---|---|
| Maker | Anthropic | — | DeepSeek | DeepSeek |
| Usage in free-pi | premium, uses allowance fast · ~41x usage | ~20x usage | ~3.0x usage | ~8.6x usage |
| Intelligence index | 56 (best) | — | 39.5 | 30.4 |
| Coding index | — | — | — | 59.4 |
| Context window | 1,000,000 tokens | — | 1,048,576 tokens (best) | 1,048,576 tokens (best) |
| Max output | 128,000 tokens | — | 393,216 tokens (best) | 384,000 tokens |
| Inputs | Text, image, file (best) | — | Text, image | Text |
| Tool calling | Yes | — | Yes | Yes |
| Reasoning effort | Yes | — | Yes | Yes |
| Structured output | Yes | — | Yes | Yes |
| Released | Sep 28, 2026 | — | Oct 17, 2026 | Apr 24, 2026 |
| Model page | 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.