+
+
+
+
+
+
+
+
VS
VS
VS
VS
VS
VS
Grok-4 Heavy vs o3
Comprehensive side-by-side LLM comparison
o3 leads with 40.3% higher average benchmark score. Overall, o3 is the stronger choice for coding tasks.
+
+
+
+
xAI
Grok-4 Heavy is a multimodal language model developed by xAI. It achieves strong performance with an average score of 79.5% across 6 benchmarks. It excels particularly in AIME 2025 (100.0%), HMMT25 (96.7%), GPQA (88.4%). As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents xAI's latest advancement in AI technology.
+
+
+
+
OpenAI
o3 is a multimodal language model developed by OpenAI. It achieves strong performance with an average score of 67.5% across 22 benchmarks. It excels particularly in COLLIE (98.4%), AIME 2024 (91.6%), ARC-AGI (88.0%). It supports a 300K token context window for handling large documents. The model is available through 1 API provider. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents OpenAI's latest advancement in AI technology.
2 months newer
o3
OpenAI
2025-04-16
Grok-4 Heavy
xAI
2025-07-09
Performance Metrics
Context window and performance specifications
Average performance across 25 common benchmarks
+
+
+
+
Grok-4 Heavy
Average Score:19.1%
+
+
+
+
o3
Average Score:59.4%(+40.3%)
+
+
+
+
Knowledge Cutoff
Training data recency comparison
o3
2024-05-31
Grok-4 Heavy
2024-12-31
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
+
+
+
+
Grok-4 Heavy
0 providers
+
+
+
+
o3
1 providers
OpenAI
Throughput:
+
+
+
+
Grok-4 Heavy
Avg Score:19.1%
Providers:0
+
+
+
+
o3
Avg Score:59.4%(+40.3%)
Providers:1