Comprehensive side-by-side LLM comparison
Grok-4 Heavy leads with 14.7% higher average benchmark score. Claude Opus 4.1 is available on 4 providers. Overall, Grok-4 Heavy is the stronger choice for coding tasks.
Anthropic
Claude Opus 4.1 represents an iteration within the Claude 4 Opus line, built to deliver refined performance in complex reasoning and analysis tasks. Developed as part of Anthropic's flagship tier, it incorporates improvements to the foundational capabilities that define the Opus family of models.
xAI
Grok 4 Heavy was created as a larger, more capable variant of Grok 4, designed to provide maximum reasoning depth and analytical capability. Built for the most demanding applications requiring sophisticated problem-solving, it represents xAI's flagship offering in the fourth generation.
27 days newer

Grok-4 Heavy
xAI
2025-07-09

Claude Opus 4.1
Anthropic
2025-08-05
Context window and performance specifications
Average performance across 2 common benchmarks

Claude Opus 4.1

Grok-4 Heavy
Grok-4 Heavy
2024-12-31
Available providers and their performance metrics

Claude Opus 4.1
Anthropic
Bedrock
ZeroEval

Claude Opus 4.1

Grok-4 Heavy

Claude Opus 4.1

Grok-4 Heavy

Grok-4 Heavy