Comprehensive side-by-side LLM comparison
GPT-5 mini leads with 9.0% higher average benchmark score. GPT-5 mini offers 228.0K more tokens in context window than o3-mini. GPT-5 mini is $3.25 cheaper per million tokens. GPT-5 mini supports multimodal inputs. Overall, GPT-5 mini is the stronger choice for coding tasks.
OpenAI
GPT-5 Mini was created as a more accessible version of GPT-5, designed to provide strong capabilities with improved efficiency and lower operational costs. Built to extend GPT-5's advancements to a broader range of applications, it balances advanced performance with practical deployment considerations.
OpenAI
o3-mini was created as an efficient variant of the o3 reasoning model, designed to provide advanced thinking capabilities with reduced computational requirements. Built to make next-generation reasoning accessible to a broader range of applications, it balances analytical depth with practical speed and cost considerations.
6 months newer

o3-mini
OpenAI
2025-01-30

GPT-5 mini
OpenAI
2025-08-07
Cost per million tokens (USD)

GPT-5 mini

o3-mini
Context window and performance specifications
Average performance across 2 common benchmarks

GPT-5 mini

o3-mini
o3-mini
2023-09-30
GPT-5 mini
2024-05-30
Available providers and their performance metrics

GPT-5 mini
OpenAI
ZeroEval


GPT-5 mini

o3-mini

GPT-5 mini

o3-mini
o3-mini
Azure
OpenAI