DeepSeek V4.1 Flash vs Claude Sonnet 5.5
Lower and Larger mark one number at a time; they don’t rank the models. How well a model does depends on your task; see Benchmarks for measured results.
| Detail | DeepSeek V4.1 Flashdeepseek/deepseek-v4.1-flash | Claude Sonnet 5.5anthropic/claude-sonnet-5.5 |
|---|---|---|
| Maker | deepseek | anthropic |
| Kind | Chat | Chat |
| Input per 1M tokens | $0.07875 Lower | $2.10 |
| Cached input per 1M tokens | $0.001575 | $0.105 |
| Cache write per 1M tokens | Same as input | $2.625 |
| Output per 1M tokens | $0.315 Lower | $10.50 |
| Context window | 1,048,576 tokens Larger | 1,000,000 tokens |
| Max output | 32,768 tokens | 128,000 tokens Larger |
| Capabilities | Reasoning, tool use, vision | Reasoning, tool use, vision, file input, web search |
| Takes | Text, image | Text, image, pdf |
| Returns | Text | Text |
| Zero data retention | Not on every provider | Yes, on every provider |
| No training on requests | Not on every provider | Yes, on every provider |
| Released | 2026-09-08 | 2026-09-28 |
Example costs
Example requests, priced at today’s rates with no cached input.
| Example request | DeepSeek V4.1 Flash | Claude Sonnet 5.5 |
|---|---|---|
| 1,000 tokens in, 200 out | $0.000142 | $0.0042 |
| 10,000 tokens in, 1,000 out | $0.001103 | $0.0315 |
| 100,000 tokens in, 4,000 out | $0.009135 | $0.252 |