Model Comparison

GPT OSS 120B vs Phi 4 ReasoningWhich is better in 2026?

GPT OSS 120B significantly outperforms across most benchmarks.

Verdict: GPT OSS 120B vs Phi 4 Reasoning — which is better?

GPT OSS 120B (by OpenAI) 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.

GPT OSS 120B outperforms in 1 benchmarks (GPQA), while Phi 4 Reasoning is better at 0 benchmarks. GPT OSS 120B significantly outperforms across most benchmarks.

Choose GPT OSS 120B if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Aug 2025

Choose Phi 4 Reasoning if…

  • you are already invested in the Microsoft ecosystem
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT OSS 120B outperforms in 1 benchmarks (GPQA), while Phi 4 Reasoning is better at 0 benchmarks.

GPT OSS 120B significantly outperforms across most benchmarks.

Wed Jun 24 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

102.8B diff

GPT OSS 120B has 102.8B more parameters than Phi 4 Reasoning, making it 734.3% larger.

OpenAI
GPT OSS 120B
116.8Bparameters
Microsoft
Phi 4 Reasoning
14.0Bparameters
116.8B
GPT OSS 120B
14.0B
Phi 4 Reasoning

Context Window

Maximum input and output token capacity

Only GPT OSS 120B specifies input context (131,072 tokens). Only GPT OSS 120B specifies output context (131,072 tokens).

OpenAI
GPT OSS 120B
Input131,072 tokens
Output131,072 tokens
Microsoft
Phi 4 Reasoning
Input- tokens
Output- tokens
Wed Jun 24 2026 • llm-stats.com

License

Usage and distribution terms

GPT OSS 120B is licensed under Apache 2.0, while Phi 4 Reasoning uses MIT.

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

GPT OSS 120B

Apache 2.0

Open weights

Phi 4 Reasoning

MIT

Open weights

Release Timeline

When each model was launched

GPT OSS 120B was released on 2025-08-05, while Phi 4 Reasoning was released on 2025-04-30.

GPT OSS 120B is 3 months newer than Phi 4 Reasoning.

GPT OSS 120B

Aug 5, 2025

10 months ago

3mo 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 GPT OSS 120B'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 GPT OSS 120B's cutoff date.

GPT OSS 120B

—

Phi 4 Reasoning

Mar 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (131,072 tokens)
Higher GPQA score (80.1% vs 65.8%)
Microsoft

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

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT OSS 120B
Microsoft
Phi 4 Reasoning

FAQ

Common questions about GPT OSS 120B vs Phi 4 Reasoning.

Which is better, GPT OSS 120B or Phi 4 Reasoning?

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 120B is made by OpenAI 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 GPT OSS 120B compare to Phi 4 Reasoning in benchmarks?

GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%. 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 GPT OSS 120B and Phi 4 Reasoning?

GPT OSS 120B supports 131K 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 GPT OSS 120B and Phi 4 Reasoning?

Key differences include licensing (Apache 2.0 vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT OSS 120B and Phi 4 Reasoning?

GPT OSS 120B is developed by OpenAI and Phi 4 Reasoning is developed by Microsoft.

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