Model Comparison

DeepSeek-V2.5 vs Phi 4 ReasoningWhich is better in 2026?

DeepSeek-V2.5 significantly outperforms across most benchmarks.

Verdict: DeepSeek-V2.5 vs Phi 4 Reasoning — which is better?

DeepSeek-V2.5 (by DeepSeek) and Phi 4 Reasoning (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.

DeepSeek-V2.5 outperforms in 1 benchmarks (Arena Hard), while Phi 4 Reasoning is better at 0 benchmarks. DeepSeek-V2.5 significantly outperforms across most benchmarks.

Choose DeepSeek-V2.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks

Choose Phi 4 Reasoning if…

  • you want the most recent training data — it shipped Apr 2025
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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

DeepSeek-V2.5 outperforms in 1 benchmarks (Arena Hard), while Phi 4 Reasoning is better at 0 benchmarks.

DeepSeek-V2.5 significantly outperforms across most benchmarks.

Sat Jun 13 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

222.0B diff

DeepSeek-V2.5 has 222.0B more parameters than Phi 4 Reasoning, making it 1585.7% larger.

DeepSeek
DeepSeek-V2.5
236.0Bparameters
Microsoft
Phi 4 Reasoning
14.0Bparameters
236.0B
DeepSeek-V2.5
14.0B
Phi 4 Reasoning

Context Window

Maximum input and output token capacity

Only DeepSeek-V2.5 specifies input context (8,192 tokens). Only DeepSeek-V2.5 specifies output context (8,192 tokens).

DeepSeek
DeepSeek-V2.5
Input8,192 tokens
Output8,192 tokens
Microsoft
Phi 4 Reasoning
Input- tokens
Output- tokens
Sat Jun 13 2026 • llm-stats.com

License

Usage and distribution terms

DeepSeek-V2.5 is licensed under deepseek, while Phi 4 Reasoning uses MIT.

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

DeepSeek-V2.5

deepseek

Open weights

Phi 4 Reasoning

MIT

Open weights

Release Timeline

When each model was launched

DeepSeek-V2.5 was released on 2024-05-08, while Phi 4 Reasoning was released on 2025-04-30.

Phi 4 Reasoning is 12 months newer than DeepSeek-V2.5.

DeepSeek-V2.5

May 8, 2024

2.1 years ago

Phi 4 Reasoning

Apr 30, 2025

1.1 years ago

11mo newer

Knowledge Cutoff

When training data ends

Phi 4 Reasoning has a documented knowledge cutoff of 2025-03-01, while DeepSeek-V2.5's cutoff date is not specified.

We can confirm Phi 4 Reasoning's training data extends to 2025-03-01, but cannot make a direct comparison without DeepSeek-V2.5's cutoff date.

DeepSeek-V2.5

—

Phi 4 Reasoning

Mar 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

DeepSeek
Larger context window (8,192 tokens)
Higher Arena Hard score (76.2% vs 73.3%)
Microsoft

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

Detailed Comparison

AI Model Comparison Table
Feature
DeepSeek
DeepSeek-V2.5
Microsoft
Phi 4 Reasoning

FAQ

Common questions about DeepSeek-V2.5 vs Phi 4 Reasoning.

Which is better, DeepSeek-V2.5 or Phi 4 Reasoning?

DeepSeek-V2.5 significantly outperforms across most benchmarks. DeepSeek-V2.5 is made by DeepSeek and Phi 4 Reasoning is made by Microsoft. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does DeepSeek-V2.5 compare to Phi 4 Reasoning in benchmarks?

DeepSeek-V2.5 scores GSM8k: 95.1%, MT-Bench: 90.2%, HumanEval: 89.0%, BBH: 84.3%, AlignBench: 80.4%. Phi 4 Reasoning scores FlenQA: 97.7%, HumanEval+: 92.9%, IFEval: 83.4%, OmniMath: 76.6%, AIME 2024: 75.3%.

What are the context window sizes for DeepSeek-V2.5 and Phi 4 Reasoning?

DeepSeek-V2.5 supports 8K tokens and Phi 4 Reasoning 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-V2.5 and Phi 4 Reasoning?

Key differences include licensing (deepseek vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes DeepSeek-V2.5 and Phi 4 Reasoning?

DeepSeek-V2.5 is developed by DeepSeek and Phi 4 Reasoning is developed by Microsoft.

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