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Kimi K2-Instruct-0905 vs Phi 4 Reasoning Plus

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

Moonshot AI · Microsoft · Updated for 2026

Which is better?

Kimi K2-Instruct-0905 outperforms in 4 benchmarks (GPQA, IFEval, LiveCodeBench, MMLU-Pro), while Phi 4 Reasoning Plus is better at 2 benchmarks (AIME 2024, AIME 2025). Kimi K2-Instruct-0905 shows notably better performance in the majority of benchmarks.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Kimi K2-Instruct-0905

  • you want the strongest raw capability — it leads on 4 of 6 shared benchmarks
  • you want the most recent training data — it shipped Sep 2025

Choose Phi 4 Reasoning Plus

  • you are already invested in the Microsoft ecosystem

At a glance

The differences that matter most.

Kimi K2-Instruct-0905
Moonshot AI
Phi 4 Reasoning Plus
Microsoft
Benchmark wins
4 of 6
2 of 6
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
—
Released
Sep 2025
Apr 2025
License
MIT
MIT

Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Kimi K2-Instruct-0905 outperforms in 4 benchmarks (GPQA, IFEval, LiveCodeBench, MMLU-Pro), while Phi 4 Reasoning Plus is better at 2 benchmarks (AIME 2024, AIME 2025).

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

Tue Aug 25 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Model Size

Parameter count comparison

986.0B diff

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

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

License

Usage and distribution terms

Both models are licensed under MIT.

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

Kimi K2-Instruct-0905

MIT

Open weights

Phi 4 Reasoning Plus

MIT

Open weights

Release Timeline

When each model was launched

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

Kimi K2-Instruct-0905 is 4 months newer than Phi 4 Reasoning Plus.

Kimi K2-Instruct-0905

Sep 5, 2025

11 months ago

4mo 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 Kimi K2-Instruct-0905'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 Kimi K2-Instruct-0905's cutoff date.

Kimi K2-Instruct-0905

—

Phi 4 Reasoning Plus

Mar 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

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

Kimi K2-Instruct-0905
✓ Preferred
Phi 4 Reasoning Plus
Open in Playground

FAQ

Common questions about Kimi K2-Instruct-0905 vs Phi 4 Reasoning Plus.

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

Kimi K2-Instruct-0905 shows notably better performance in the majority of benchmarks. Kimi K2-Instruct-0905 is made by Moonshot AI and Phi 4 Reasoning Plus is made by Microsoft. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Kimi K2-Instruct-0905 compare to Phi 4 Reasoning Plus in benchmarks?

Kimi K2-Instruct-0905 scores MATH-500: 97.4%, MMLU-Redux: 92.7%, IFEval: 89.8%, AutoLogi: 89.5%, MMLU: 89.5%. Phi 4 Reasoning Plus scores FlenQA: 97.9%, HumanEval+: 92.3%, IFEval: 84.9%, OmniMath: 81.9%, AIME 2024: 81.3%.

Who makes Kimi K2-Instruct-0905 and Phi 4 Reasoning Plus?

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

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