DeepSeek V4 Pro (Preview) vs Qwen3.8 Max
Humanity's Last Exam Humanity's Last Exam: Very hard expert questions across many fields, written to stump today’s models
DeepSeek V4 Pro (Preview)—
Qwen Max43
Terminal-Bench 4.0 Terminal-Bench 4.0 · source setting 2: Agents use a terminal to complete executable coding, system administration and research tasks in the 4.0 suite
DeepSeek V4 Pro (Preview)—
Qwen Max18.7
AutomationBench-AA AutomationBench-AA: Agents orchestrate SaaS workflows through APIs; objectives receive credit only when the task has no guardrail violation
DeepSeek V4 Pro (Preview)—
Qwen Max49.2
Arena Text · creative writing Arena Text · creative writing: Human pairwise preferences in the stated text vote pool
DeepSeek V4 Pro (Preview)—
Qwen Max · max1,469
MMMU-Pro (vision) MMMU-Pro (vision): College-level questions that require understanding images: charts, diagrams, photos
DeepSeek V4 Pro (Preview)—
Qwen Max82.3
| Benchmark | DeepSeek V4 Pro (Preview) | Qwen Max |
|---|---|---|
| Humanity's Last Exam | — | 43 |
| Terminal-Bench 4.0 | — | 18.7 |
| AutomationBench-AA | — | 49.2 |
| Arena Text · creative writing | — | 1,469 · max |
| MMMU-Pro (vision) | — | 82.3 |
Specs
| Spec | DeepSeek V4 Pro (Preview) | Qwen Max |
|---|---|---|
| Input, per 1M | $1.30 | $2 |
| Output, per 1M | $2.60 | $6 |
| Cost per task? | — | $2.67 |
| Speed, tok/s | — | 38 |
| Context | — | 1M |
| Weights | Not verified | Closed |
| Released | — | Aug 2026 |
| See images | — | ✓ |
| Read PDFs | — | Partial |
| Hear audio | — | — |
| Watch video | — | ✓ |
| Call tools | Partial | ✓ |
| Force a tool call | ✓ | Partial |
| Return strict JSON | ✓ | ✓ |
| Search the web | ? | ? |
| Run code | ? | ? |
| Use a computer | ? | ? |
What breaks when you switch
DeepSeek V4 Pro (Preview) → Qwen Max
max_tokens range · QwenCloud›
With thinking enabled, max_tokens outside 1–32768 returns HTTP 400; use max_completion_tokens to budget reasoning plus answer without that cap.
File is not delivered · QwenCloud / Responses›
PDF input through Responses returns HTTP 200 without delivering the file to the model; use Chat Completions or DashScope.
Not simultaneously · QwenCloud›
Setting reasoning_effort and thinking_budget together returns an error; set only one.
tool_choice only supports auto or none · QwenCloud›
With thinking enabled, tool_choice supports only auto or none.
Include the word JSON · QwenCloud›
JSON Object mode requires the word JSON in a system or user message; otherwise the API returns an error.
Agent search_strategy not supported · QwenCloud / Chat Completions›
Chat Completions does not support Qwen3.8 agent search_strategy; use the Responses web_search tool for multi-turn retrieval.
Qwen Max → DeepSeek V4 Pro (Preview)