All comparisons

GPT-4.5 vs GPT-4o (05-13)

Side-by-side comparison of specifications, capabilities, and pricing.

	GPT-4.5 OpenAI	GPT-4o (05-13) OpenAI
Released	2026-03-12	2024-05-13
Context window	8K	128K
Parameters	—	1.76T (8x222B MoE)*
Architecture	—	mixture of experts
License	Proprietary	Proprietary
Knowledge cutoff	2025-04	2023-10
Capabilities
Vision
Multimodal
Reasoning
Function calling
Tool use
JSON mode
Code execution
Availability
Providers	—	Azure OpenAIOpenAI APIOpenRouterOpenAI Batch APIReplicate API

Benchmarks

HellaSwag—96.4HumanEval—90.2Massive Multitask Language Understanding—88.7