Claude Opus 5.5 vs GPT-6 Astra: Terminal-Bench 66% [2026]
Anthropic released Claude Opus 5.5 on September 22, 2026 and Claude Sonnet 5.5 on September 28, 2026, with Opus 5.5 posting the highest Terminal-Bench 4.0 score among the frontier models reviewed and an Artificial Analys…