Comparing 2 models

GPT-5.6 Luna vs Grok 4.5

Facts first, then task-specific rankings. A highlighted cell is better only for that row, not universally.

metric
Model 1GPT-5.6 Luna
Model 2Grok 4.5
Best for
Competition Math (#1)
Best Cheap LLM for High Volume (#3)
Provider
openai
x-ai
Context
1.1MBest
500K
Input / 1M
$1Best
$2
Output / 1M
$6Best
$6Best
Tool use
yesBest
yesBest
Vision
yesBest
yesBest
Reasoning
yesBest
yesBest
Open-weight
Released
Jul 9, 2026
Jul 7, 2026