Comprehensive side-by-side LLM comparison
o3 leads with 6.7% higher average benchmark score. o3 offers 164.0K more tokens in context window than DeepSeek-R1. DeepSeek-R1 is $47.26 cheaper per million tokens. o3 supports multimodal inputs. Overall, o3 is the stronger choice for coding tasks.
DeepSeek
DeepSeek-R1, released by DeepSeek on January 20, 2025, is a large reasoning model with 671 billion total parameters (37 billion active in its MoE architecture) designed for extended chain-of-thought reasoning. It features a 128K token context window and demonstrated strong performance on mathematics, coding, and scientific reasoning benchmarks at its release. DeepSeek-R1 targets complex analytical tasks, competitive programming, and applications requiring deep deliberative reasoning under an open MIT license.
OpenAI
OpenAI o3, released by OpenAI in April 2025, is a large reasoning model that applies extended chain-of-thought processing to deliver improved performance on complex math, science, and coding tasks. It features a 200K token context window and native image understanding, with demonstrated strong results on mathematics and software engineering benchmarks. o3 targets demanding analytical and engineering tasks where deliberate, multi-step reasoning produces significantly better outcomes than direct generation.
2 months newer

DeepSeek-R1
DeepSeek
2025-01-20

o3
OpenAI
2025-04-16
Cost per million tokens (USD)
DeepSeek-R1
o3
Context window and performance specifications
Average performance across 1 common benchmarks
DeepSeek-R1
o3
Performance comparison across key benchmark categories
DeepSeek-R1
o3
Available providers and their performance metrics
DeepSeek-R1
DeepSeek
o3
DeepSeek-R1
o3
DeepSeek-R1
o3
OpenAI