DeepSeek V4.1 Flash vs DeepSeek V4.1 Flash 1017
Different efforts: non-thinking · max · Compare all at high
Arena Text · creative writing Arena Text · creative writing: Human pairwise preferences in the stated text vote pool
DeepSeek V4.1 Flash · max1,440
DeepSeek V4.1 Flash 10171,408
EQ-Bench Longform Creative Writing 1.11 Longform Creative Writing 1.11: Models plan, revise and write a story across eight turns, graded with a writing rubric
DeepSeek V4.1 Flash74
DeepSeek V4.1 Flash 101766
EQ-Bench Creative Writing v3 Creative Writing v3 · Elo: Judge-rated creative writing under the v3 prompt set and pairwise ranking
DeepSeek V4.1 Flash1,540.1
DeepSeek V4.1 Flash 10171,559.1
Lech Mazur Short-Story Lech Mazur Short-Story · comparison score: Judges compare stories written to ten required elements; the comparison score can be negative
DeepSeek V4.1 Flash · high-0.5
DeepSeek V4.1 Flash 1017—
Harvey LAB-AA 1.1 Harvey LAB-AA 1.1: Legal agents work from case documents; every rubric criterion must pass and material hallucinations receive no credit
DeepSeek V4.1 Flash · max1.7
DeepSeek V4.1 Flash 1017—
| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4.1 Flash 1017 |
|---|---|---|
| Arena Text · creative writing | 1,440 · max | 1,408 |
| EQ-Bench Longform Creative Writing 1.11 | 74 | 66 |
| EQ-Bench Creative Writing v3 | 1,540.1 | 1,559.1 |
| Lech Mazur Short-Story | -0.5 · high | — |
| Harvey LAB-AA 1.1 | 1.7 · 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