Comparing 2 models

Claude Opus 4.5 vs GPT-5.6 Luna

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

metric
Model 1Claude Opus 4.5
Model 2GPT-5.6 Luna
Best for
Tool & Function Calling (#1)
Massive Context (#2)
Provider
anthropic
openai
Context
200K
1.1MBest
Input / 1M
$5
$0.100Best
Output / 1M
$25
$0.60Best
Tool use
yesBest
yesBest
Vision
yesBest
yesBest
Reasoning
yesBest
yesBest
Open-weight
Released
Nov 1, 2025
Jul 9, 2026