DeepSeek V4.1 Flash vs DeepSeek V4.1 Flash 1017
Different efforts: non-thinking · max · Compare all at high
MMMU-Pro (vision) MMMU-Pro (vision): College-level questions that require understanding images: charts, diagrams, photos
DeepSeek V4.1 Flash65.6
DeepSeek V4.1 Flash 101780.6
GDP.pdf · AA all-pass GDP.pdf · AA all-pass: Models reason over professional PDF documents; an attempt passes only when every atomic criterion passes
DeepSeek V4.1 Flash3.8
DeepSeek V4.1 Flash 101717.2
Chartography Chartography: Expert chart reasoning over professional scientific, medical, financial and engineering charts
DeepSeek V4.1 Flash · max11.6
DeepSeek V4.1 Flash 1017—
Arena Vision · overall Arena Vision · overall: Human pairwise preferences in the stated vision vote pool
DeepSeek V4.1 Flash · max1,277.9
DeepSeek V4.1 Flash 1017—
| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4.1 Flash 1017 |
|---|---|---|
| MMMU-Pro (vision) | 65.6 | 80.6 |
| GDP.pdf · AA all-pass | 3.8 | 17.2 |
| Chartography | 11.6 · max | — |
| Arena Vision · overall | 1,277.9 · max | — |
Specs
| Spec | DeepSeek V4.1 Flash | DeepSeek V4.1 Flash 1017 |
|---|---|---|
| Input, per 1M | !$0.30 | $0.30 |
| Output, per 1M | !$1.20 | $1.20 |
| Cost per task? | $0.22 | $0.26 |
| Speed, tok/s | 201 | 167 |
| Context | 1M | 1M |
| Weights | Open | Open |
| Released | Sep 2026 | Oct 2026 |
| Memory (4-bit) | — | 458 GB |
| Licence | — | MIT |
| Commercial use | — | Allowed |
| See images | ? | ✓ |
| Read PDFs | ? | — |
| Hear audio | ? | — |
| Watch video | ? | — |
| Call tools | ✓ | ✓ |
| Force a tool call | ? | ✓ |
| Return strict JSON | ✓ | ✓ |
| Search the web | ? | ? |
| Run code | ? | ? |
| Use a computer | ? | ? |
What breaks when you switch
DeepSeek V4.1 Flash → DeepSeek V4.1 Flash 1017
Pass back reasoning_content · Chat Completions›
With thinking and tools, return all prior reasoning_content even on turns without tool calls or the API returns HTTP 400.
Disable thinking mode first · Chat Completions›
Required and named tool choices return HTTP 400 in thinking mode; disable thinking first.
Parameters have no effect›
In thinking mode, temperature, presence_penalty and frequency_penalty have no effect.
Values below 0.95›
Flash clamps top_p below 0.95 to 0.95 while thinking and ignores it in non-thinking mode, using 1.0.
Stateless API · Responses›
Responses does not support previous_response_id or conversation; preserve conversation history in your client.
DeepSeek V4.1 Flash 1017 → DeepSeek V4.1 Flash