Comprehensive side-by-side LLM comparison
GPT-4.5 leads with 10.9% higher average benchmark score. GPT-4o offers 12.3K more tokens in context window than GPT-4.5. GPT-4o is $212.50 cheaper per million tokens. Overall, GPT-4.5 is the stronger choice for coding tasks.
OpenAI
GPT-4.5 was developed as an intermediate advancement between GPT-4 and GPT-5, designed to incorporate incremental improvements in reasoning, factuality, and instruction-following. Built to bridge generational capabilities while maintaining compatibility with existing applications, it represents a refinement of the GPT-4 architecture with enhanced performance characteristics.
OpenAI
This updated version of GPT-4o was released with refinements to its multimodal capabilities and improved performance across text, vision, and audio tasks. Built to incorporate learnings from the initial GPT-4o deployment, it enhanced reliability and accuracy while maintaining the seamless cross-modal reasoning that defines the GPT-4o family.
6 months newer

GPT-4o
OpenAI
2024-08-06

GPT-4.5
OpenAI
2025-02-27
Cost per million tokens (USD)

GPT-4.5

GPT-4o
Context window and performance specifications
Average performance across 24 common benchmarks

GPT-4.5

GPT-4o
Performance comparison across key benchmark categories

GPT-4.5

GPT-4o
Available providers and their performance metrics

GPT-4.5
OpenAI

GPT-4o

GPT-4.5

GPT-4o

GPT-4.5

GPT-4o
Azure
OpenAI