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gpt-oss-120b vs Phi-3 Medium 128K Instruct (Comparative Analysis)

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Comparative Analysis: gpt-oss-120b vs. Phi-3 Medium 128K Instruct
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Overview

Phi-3 Medium 128K Instruct was released 1 year before gpt-oss-120b.
gpt-oss-120bgpt-oss-120b
Phi-3 Medium 128K InstructPhi-3 Medium 128K Instruct
Model Provider
The organization behind this AI's development
OpenAI logoOpenAI
Microsoft logoMicrosoft
Input Context Window
Maximum input tokens this model can process at once
131K
tokens
128K
tokens
Output Token Limit
Maximum output tokens this model can generate at once
131K
tokens
Not specified
tokens
Release Date
When this model first became publicly available
August 5th, 2025
May 24th, 2024

Capabilities & Features

Compare supported features, modalities, and advanced capabilities
gpt-oss-120b
Phi-3 Medium 128K Instruct
Input Types
Supported input formats
📝Text
📝Text
Output Types
Supported output formats
📝Text
📝Text
Tokenizer
Text encoding system
GPTOther
Key Features
Advanced capabilities
Function CallingStructured OutputReasoning ModeContent Moderation
Function CallingStructured OutputReasoning ModeContent Moderation
Open Source
Model availability
Available on HuggingFace →Available on HuggingFace →

Pricing

gpt-oss-120b is roughly 0.07x less expensive compared to Phi-3 Medium 128K Instruct for input tokens and roughly 0.3x less expensive for output tokens.
gpt-oss-120bgpt-oss-120b
Phi-3 Medium 128K InstructPhi-3 Medium 128K Instruct
Input Token Cost
Cost per million input tokens
$0.07
per million tokens
$1.00
per million tokens
Output Token Cost
Cost per million outut tokens
$0.28
per million tokens
$1.00
per million tokens

Benchmarks

Compare relevant benchmarks between gpt-oss-120b and Phi-3 Medium 128K Instruct.
gpt-oss-120bgpt-oss-120b
Phi-3 Medium 128K InstructPhi-3 Medium 128K Instruct
MMLU
Measures knowledge across 57 subjects like law, math, history, and science
Benchmark not available.
Benchmark not available.
MMMU
Measures understanding of combined text and images across various domains
Benchmark not available.
Benchmark not available.
HellaSwag
Measures common sense reasoning by having models complete sentences about everyday situations
Benchmark not available.
Benchmark not available.

At a Glance

Quick overview of what makes gpt-oss-120b and Phi-3 Medium 128K Instruct unique.
OpenAI logogpt-oss-120b by OpenAI can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 131K token context window. Very affordable at $0.07/M input and $0.28/M output tokens. Released August 5th, 2025.
Microsoft logoPhi-3 Medium 128K Instruct by Microsoft can use external tools and APIs. It can handle standard conversations with its 128K token context window. Reasonably priced at $1.00/M input and $1.00/M output tokens. Released May 24th, 2024.

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