DeepSeek V4 Flash 0423 is 9.2× cheaper per million tokens (blended). Claude Sonnet 5.5 leads quality index by 8.2 points (93.2 vs 85.0). DeepSeek V4 Flash 0423 has the larger context window (1,048,576 vs 1,000,000 tokens). DeepSeek V4 Flash 0423 is open-weights; the other is not.
Claude Sonnet 5.5 vs DeepSeek V4 Flash 0423
Live catalog fields. Best-in-row is highlighted.
Claude Sonnet 5.5
Anthropic · anthropic__claude-sonnet-5.5
DeepSeek V4 Flash 0423open
DeepSeek · deepseek__deepseek-v4-flash
Identity
| Field | anthropic__claude-sonnet-5.5 | deepseek__deepseek-v4-flash |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Slug | anthropic__claude-sonnet-5.5 | deepseek__deepseek-v4-flash |
| Status | live | live |
| Open weights | No | Yes |
| License | — | — |
| HuggingFace | — | deepseek-ai/DeepSeek-V4-Flash |
Quality
| Field | anthropic__claude-sonnet-5.5 | deepseek__deepseek-v4-flash |
|---|---|---|
| Quality index (0–100) | 93.2 | 85.0 |
Cost
| Field | anthropic__claude-sonnet-5.5 | deepseek__deepseek-v4-flash |
|---|---|---|
| Input $ / 1M tokens | $2.00 | $0.03 |
| Cached input $ / 1M | $0.20 | $0.03 |
| Output $ / 1M tokens | $10.00 | $1.28 |
Context
| Field | anthropic__claude-sonnet-5.5 | deepseek__deepseek-v4-flash |
|---|---|---|
| Max context tokens | 1,000,000 | 1,048,576 |
| Max output tokens | 128,000 | 943,718 |
Modalities
| Field | anthropic__claude-sonnet-5.5 | deepseek__deepseek-v4-flash |
|---|---|---|
| Input | text, image, file | text |
| Output | text | text |