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A side-by-side comparison of Claude Sonnet 5.5 and DeepSeek V4 Flash, using the lowest price and highest limits found across every provider that offers each model.
| Claude Sonnet 5.5 | DeepSeek V4 Flash | |
|---|---|---|
| Providers | 55 | 53 |
| Cheapest input ($/M) | $0.2 via Api.Airforce | $0 via LLMTR |
| Cheapest output ($/M) | $1 via Api.Airforce | $0 via LLMTR |
| Max context | 1M | 1.1M |
| Max output | 1M | 1M |
| Released | Sep 26, 2026 | Apr 22, 2026 |
| Open weights | No | Yes |
| Features | ReasoningToolsStructured outputFiles | ReasoningToolsStructured outputTemperature |
| Input modalities | FileImageText | Text |
| Output modalities | Text | Text |