Model Comparison

DeepSeek-V4-Flash-0731 vs o1-proWhich is better in 2026?

Comparing DeepSeek-V4-Flash-0731 and o1-pro across benchmarks, pricing, and capabilities.

Verdict: DeepSeek-V4-Flash-0731 vs o1-pro — which is better?

DeepSeek-V4-Flash-0731 (by DeepSeek) and o1-pro (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Choose DeepSeek-V4-Flash-0731 if…

  • you want the most recent training data — it shipped Jul 2026
  • you need open weights you can self-host or fine-tune

Choose o1-pro if…

  • you are already invested in the OpenAI ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

DeepSeek-V4-Flash-0731 and o1-prodon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only DeepSeek-V4-Flash-0731 specifies input context (1,048,576 tokens). Only DeepSeek-V4-Flash-0731 specifies output context (65,536 tokens).

DeepSeek
DeepSeek-V4-Flash-0731
Input1,048,576 tokens
Output65,536 tokens
OpenAI
o1-pro
Input- tokens
Output- tokens
Mon Aug 03 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

o1-pro supports multimodal inputs, whereas DeepSeek-V4-Flash-0731 does not.

o1-pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

DeepSeek-V4-Flash-0731

Text
Images
Audio
Video

o1-pro

Text
Images
Audio
Video

License

Usage and distribution terms

DeepSeek-V4-Flash-0731 is licensed under MIT, while o1-pro uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

DeepSeek-V4-Flash-0731

MIT

Open weights

o1-pro

Proprietary

Closed source

Release Timeline

When each model was launched

DeepSeek-V4-Flash-0731 was released on 2026-07-31, while o1-pro was released on 2024-12-17.

DeepSeek-V4-Flash-0731 is 20 months newer than o1-pro.

DeepSeek-V4-Flash-0731

Jul 31, 2026

3 days ago

1.6yr newer
o1-pro

Dec 17, 2024

1.6 years ago

Knowledge Cutoff

When training data ends

o1-pro has a documented knowledge cutoff of 2023-09-30, while DeepSeek-V4-Flash-0731's cutoff date is not specified.

We can confirm o1-pro's training data extends to 2023-09-30, but cannot make a direct comparison without DeepSeek-V4-Flash-0731's cutoff date.

DeepSeek-V4-Flash-0731

—

o1-pro

Sep 2023

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

DeepSeek
Larger context window (1,048,576 tokens)
Has open weights
OpenAI
Supports multimodal inputs

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against DeepSeek-V4-Flash-0731 and o1-pro side-by-side, then vote on the output you prefer.

DeepSeek-V4-Flash-0731
✓ Preferred
o1-pro
Open in Playground
AI Model Comparison Table
Feature
DeepSeek
DeepSeek-V4-Flash-0731
OpenAI
o1-pro

FAQ

Common questions about DeepSeek-V4-Flash-0731 vs o1-pro.

Which is better, DeepSeek-V4-Flash-0731 or o1-pro?

DeepSeek-V4-Flash-0731 (DeepSeek) and o1-pro (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does DeepSeek-V4-Flash-0731 compare to o1-pro in benchmarks?

DeepSeek-V4-Flash-0731 scores Terminal-Bench 2.1: 82.7%, CyberGym: 76.7%, Toolathlon: 70.3%, DSBench-FullStack: 68.7%, DSBench-Hard: 59.6%. o1-pro scores AIME 2024: 86.0%, GPQA: 79.0%.

What are the context window sizes for DeepSeek-V4-Flash-0731 and o1-pro?

DeepSeek-V4-Flash-0731 supports 1.0M tokens and o1-pro supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between DeepSeek-V4-Flash-0731 and o1-pro?

Key differences include multimodal support (no vs yes), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes DeepSeek-V4-Flash-0731 and o1-pro?

DeepSeek-V4-Flash-0731 is developed by DeepSeek and o1-pro is developed by OpenAI.

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