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GPT-5 vs Llama 3.1 405B (base) (Comparative Analysis)

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Comparative Analysis: GPT-5 vs. Llama 3.1 405B (base)
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Overview

Llama 3.1 405B (base) was released 1 year before GPT-5.
GPT-5GPT-5
Llama 3.1 405B (base)Llama 3.1 405B (base)
Model Provider
The organization behind this AI's development
OpenAI logoOpenAI
Meta logoMeta
Input Context Window
Maximum input tokens this model can process at once
400K
tokens
32.8K
tokens
Output Token Limit
Maximum output tokens this model can generate at once
128K
tokens
Not specified
tokens
Release Date
When this model first became publicly available
August 7th, 2025
August 2nd, 2024

Capabilities & Features

Compare supported features, modalities, and advanced capabilities
GPT-5
Llama 3.1 405B (base)
Input Types
Supported input formats
📝Text🖼️Image📁File
📝Text
Output Types
Supported output formats
📝Text
📝Text
Tokenizer
Text encoding system
GPTLlama3
Key Features
Advanced capabilities
Function CallingStructured OutputReasoning ModeContent Moderation
Function CallingStructured OutputReasoning ModeContent Moderation
Open Source
Model availability
ProprietaryAvailable on HuggingFace →

Pricing

GPT-5 is roughly 0.6x less expensive compared to Llama 3.1 405B (base) for input tokens and roughly 5.0x more expensive for output tokens.
GPT-5GPT-5
Llama 3.1 405B (base)Llama 3.1 405B (base)
Input Token Cost
Cost per million input tokens
$1.25
per million tokens
$2.00
per million tokens
Output Token Cost
Cost per million outut tokens
$10.00
per million tokens
$2.00
per million tokens

Benchmarks

Compare relevant benchmarks between GPT-5 and Llama 3.1 405B (base).
GPT-5GPT-5
Llama 3.1 405B (base)Llama 3.1 405B (base)
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-5 and Llama 3.1 405B (base) unique.
OpenAI logoGPT-5 by OpenAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 400K token context window. Reasonably priced at $1.25/M input and $10.00/M output tokens. Includes built-in content moderation for safer outputs. Released August 7th, 2025.
Meta logoLlama 3.1 405B (base) by Meta is a text-based AI model. It can handle standard conversations with its 32.8K token context window. Reasonably priced at $2.00/M input and $2.00/M output tokens. Released August 2nd, 2024.

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