All comparisons

Grok-3 vs o3

Side-by-side comparison of specifications, capabilities, and pricing.

	Grok-3 xAI	o3 OpenAI
Released	2026-01-15	2025-03-31
Context window	1M	128K
Parameters	1B	—
Architecture	—	decoder only
License	Proprietary	Unknown
Knowledge cutoff	2025-04	—
Capabilities
Vision
Multimodal
Reasoning
Function calling
Tool use
Structured Outputs
Code execution
Availability
Providers	OpenRouterxAI ConsoleChutes AI	OpenAI APIOpenRouterOpenAI Batch API

Benchmarks

Aider Polyglot53.381.3Chatbot Arena1405.01412.0Massive Multi-discipline Multimodal Understanding78.082.9MMLU PRO79.9—HumanEval—96.7SWE-bench Verified—71.7LiveCodeBench—79.1Google-Proof Q&A—87.7