Comprehensive side-by-side LLM comparison
GPT-5 Mini offers 132.8K more tokens in context window than o3 mini. o3 mini is $19.50 cheaper per million tokens. GPT-5 Mini supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
OpenAI
GPT-5 mini, released by OpenAI in August 2025, is a smaller variant from the GPT-5 family that inherits GPT-5's unified reasoning architecture and multimodal capabilities at a reduced inference cost. It targets high-volume production use cases requiring a balance of intelligence and response speed, offering GPT-5 capabilities for applications where full GPT-5 inference costs are a concern.
OpenAI
OpenAI o3 mini, released by OpenAI in January 2025, is a compact reasoning model from the o3 family designed for efficient, cost-effective STEM problem-solving. It features a 200K token context window and adjustable chain-of-thought effort settings, allowing developers to trade reasoning depth for speed. o3 mini targets science, mathematics, and coding applications where lower inference cost and faster response times are a priority.
6 months newer

o3 mini
OpenAI
2025-01-31

GPT-5 Mini
OpenAI
2025-08
Cost per million tokens (USD)
GPT-5 Mini
o3 mini
Context window and performance specifications
Available providers and their performance metrics
GPT-5 Mini
OpenAI
o3 mini
GPT-5 Mini
o3 mini
GPT-5 Mini
o3 mini
OpenAI