Comprehensive side-by-side LLM comparison
o3 leads with 74.1% higher average benchmark score. o3 offers 279.5K more tokens in context window than GPT-3.5 Turbo. GPT-3.5 Turbo is $8.00 cheaper per million tokens. o3 supports multimodal inputs. Overall, o3 is the stronger choice for coding tasks.
OpenAI
GPT-3.5 Turbo was developed as an optimized version of GPT-3.5, designed to provide a balance of capability and efficiency for conversational and completion tasks. Built to serve as a cost-effective option for applications requiring reliable language understanding and generation, it became widely adopted for chatbots, content generation, and general-purpose AI assistance.
OpenAI
o3 represents the next generation in OpenAI's reasoning model series, developed to advance the capabilities of deliberate, step-by-step problem solving. Built to handle increasingly complex challenges across mathematics, science, and coding, it continues the evolution of reasoning-focused AI with improved analytical depth and accuracy.
2 years newer

GPT-3.5 Turbo
OpenAI
2023-03-21

o3
OpenAI
2025-04-16
Cost per million tokens (USD)

GPT-3.5 Turbo

o3
Context window and performance specifications
Average performance across 3 common benchmarks

GPT-3.5 Turbo

o3
GPT-3.5 Turbo
2021-09-30
o3
2024-05-31
Available providers and their performance metrics

GPT-3.5 Turbo
Azure
OpenAI


GPT-3.5 Turbo

o3

GPT-3.5 Turbo

o3
o3
OpenAI