Model Comparison

DeepSeek-V4-Flash-0731 vs Phi 4 Reasoning PlusWhich is better in 2026?

Comparing DeepSeek-V4-Flash-0731 and Phi 4 Reasoning Plus across benchmarks, pricing, and capabilities.

Verdict: DeepSeek-V4-Flash-0731 vs Phi 4 Reasoning Plus — which is better?

DeepSeek-V4-Flash-0731 (by DeepSeek) and Phi 4 Reasoning Plus (by Microsoft) 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

Choose Phi 4 Reasoning Plus if…

  • you are already invested in the Microsoft ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

DeepSeek-V4-Flash-0731 and Phi 4 Reasoning Plusdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Model Size

Parameter count comparison

290.0B diff

DeepSeek-V4-Flash-0731 has 290.0B more parameters than Phi 4 Reasoning Plus, making it 2071.4% larger.

DeepSeek
DeepSeek-V4-Flash-0731
304.0Bparameters
Microsoft
Phi 4 Reasoning Plus
14.0Bparameters
304.0B
DeepSeek-V4-Flash-0731
14.0B
Phi 4 Reasoning Plus

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
Microsoft
Phi 4 Reasoning Plus
Input- tokens
Output- tokens
Tue Aug 04 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under MIT.

Both models share the same licensing terms, providing consistent usage rights.

DeepSeek-V4-Flash-0731

MIT

Open weights

Phi 4 Reasoning Plus

MIT

Open weights

Release Timeline

When each model was launched

DeepSeek-V4-Flash-0731 was released on 2026-07-31, while Phi 4 Reasoning Plus was released on 2025-04-30.

DeepSeek-V4-Flash-0731 is 15 months newer than Phi 4 Reasoning Plus.

DeepSeek-V4-Flash-0731

Jul 31, 2026

3 days ago

1.3yr newer
Phi 4 Reasoning Plus

Apr 30, 2025

1.3 years ago

Knowledge Cutoff

When training data ends

Phi 4 Reasoning Plus has a documented knowledge cutoff of 2025-03-01, while DeepSeek-V4-Flash-0731's cutoff date is not specified.

We can confirm Phi 4 Reasoning Plus's training data extends to 2025-03-01, but cannot make a direct comparison without DeepSeek-V4-Flash-0731's cutoff date.

DeepSeek-V4-Flash-0731

—

Phi 4 Reasoning Plus

Mar 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

DeepSeek
Larger context window (1,048,576 tokens)
Microsoft

No standout differentiators in the data we have for this pair.

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against DeepSeek-V4-Flash-0731 and Phi 4 Reasoning Plus side-by-side, then vote on the output you prefer.

DeepSeek-V4-Flash-0731
✓ Preferred
Phi 4 Reasoning Plus
Open in Playground
AI Model Comparison Table
Feature
DeepSeek
DeepSeek-V4-Flash-0731
Microsoft
Phi 4 Reasoning Plus

FAQ

Common questions about DeepSeek-V4-Flash-0731 vs Phi 4 Reasoning Plus.

Which is better, DeepSeek-V4-Flash-0731 or Phi 4 Reasoning Plus?

DeepSeek-V4-Flash-0731 (DeepSeek) and Phi 4 Reasoning Plus (Microsoft) 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 Phi 4 Reasoning Plus 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%. Phi 4 Reasoning Plus scores FlenQA: 97.9%, HumanEval+: 92.3%, IFEval: 84.9%, OmniMath: 81.9%, AIME 2024: 81.3%.

What are the context window sizes for DeepSeek-V4-Flash-0731 and Phi 4 Reasoning Plus?

DeepSeek-V4-Flash-0731 supports 1.0M tokens and Phi 4 Reasoning Plus supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes DeepSeek-V4-Flash-0731 and Phi 4 Reasoning Plus?

DeepSeek-V4-Flash-0731 is developed by DeepSeek and Phi 4 Reasoning Plus is developed by Microsoft.

Related comparisons