Model Comparison

Kimi K2 0905 vs Phi 4 ReasoningWhich is better in 2026?

Kimi K2 0905 shows notably better performance in the majority of benchmarks.

Verdict: Kimi K2 0905 vs Phi 4 Reasoning — which is better?

Kimi K2 0905 (by Moonshot AI) 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.

Kimi K2 0905 outperforms in 2 benchmarks (GPQA, MMLU-Pro), while Phi 4 Reasoning is better at 1 benchmark (AIME 2024). Kimi K2 0905 shows notably better performance in the majority of benchmarks.

Choose Kimi K2 0905 if…

  • you want the strongest raw capability — it leads on 2 of 3 shared benchmarks
  • you want the most recent training data — it shipped Sep 2025

Choose Phi 4 Reasoning if…

  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Kimi K2 0905 outperforms in 2 benchmarks (GPQA, MMLU-Pro), while Phi 4 Reasoning is better at 1 benchmark (AIME 2024).

Kimi K2 0905 shows notably better performance in the majority of benchmarks.

Fri Jun 26 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

986.0B diff

Kimi K2 0905 has 986.0B more parameters than Phi 4 Reasoning, making it 7042.9% larger.

Moonshot AI
Kimi K2 0905
1.0Tparameters
Microsoft
Phi 4 Reasoning
14.0Bparameters
1000.0B
Kimi K2 0905
14.0B
Phi 4 Reasoning

Context Window

Maximum input and output token capacity

Only Kimi K2 0905 specifies input context (262,144 tokens). Only Kimi K2 0905 specifies output context (262,144 tokens).

Moonshot AI
Kimi K2 0905
Input262,144 tokens
Output262,144 tokens
Microsoft
Phi 4 Reasoning
Input- tokens
Output- tokens
Fri Jun 26 2026 • llm-stats.com

License

Usage and distribution terms

Kimi K2 0905 is licensed under a proprietary license, while Phi 4 Reasoning uses MIT.

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

Kimi K2 0905

Proprietary

Closed source

Phi 4 Reasoning

MIT

Open weights

Release Timeline

When each model was launched

Kimi K2 0905 was released on 2025-09-05, while Phi 4 Reasoning was released on 2025-04-30.

Kimi K2 0905 is 4 months newer than Phi 4 Reasoning.

Kimi K2 0905

Sep 5, 2025

9 months ago

4mo newer
Phi 4 Reasoning

Apr 30, 2025

1.2 years ago

Knowledge Cutoff

When training data ends

Phi 4 Reasoning has a documented knowledge cutoff of 2025-03-01, while Kimi K2 0905'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 Kimi K2 0905's cutoff date.

Kimi K2 0905

—

Phi 4 Reasoning

Mar 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Moonshot AI
Larger context window (262,144 tokens)
Higher GPQA score (75.8% vs 65.8%)
Higher MMLU-Pro score (82.5% vs 74.3%)
Microsoft
Has open weights
Higher AIME 2024 score (75.3% vs 72.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Kimi K2 0905 and Phi 4 Reasoning side-by-side, then vote on the output you prefer.

Kimi K2 0905
✓ Preferred
Phi 4 Reasoning
Open in Playground
AI Model Comparison Table
Feature
Moonshot AI
Kimi K2 0905
Microsoft
Phi 4 Reasoning

FAQ

Common questions about Kimi K2 0905 vs Phi 4 Reasoning.

Which is better, Kimi K2 0905 or Phi 4 Reasoning?

Kimi K2 0905 shows notably better performance in the majority of benchmarks. Kimi K2 0905 is made by Moonshot AI 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 Kimi K2 0905 compare to Phi 4 Reasoning in benchmarks?

Kimi K2 0905 scores HumanEval: 94.5%, MMLU: 90.2%, MATH: 89.1%, MMLU-Pro: 82.5%, GPQA: 75.8%. 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 Kimi K2 0905 and Phi 4 Reasoning?

Kimi K2 0905 supports 262K 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 Kimi K2 0905 and Phi 4 Reasoning?

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

Who makes Kimi K2 0905 and Phi 4 Reasoning?

Kimi K2 0905 is developed by Moonshot AI and Phi 4 Reasoning is developed by Microsoft.

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