Comprehensive side-by-side LLM comparison
o3 offers 160.7K more tokens in context window than Grok 2. Grok 2 is $38.00 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
xAI
Grok 2, released by xAI in August 2024, is a large language model with 131K token context window and native image understanding, developed with access to real-time information from the X platform. It features multimodal input capabilities and improved reasoning over its predecessor. Grok 2 targets conversational assistants, image analysis, and real-time information retrieval tasks via the xAI API.
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.
8 months newer

Grok 2
xAI
2024-08-14

o3
OpenAI
2025-04-16
Cost per million tokens (USD)
Grok 2
o3
Context window and performance specifications
Available providers and their performance metrics
Grok 2
xAI
o3
Grok 2
o3
Grok 2
o3
OpenAI