claude sonnet 5.5

Sonnet 5.5 vs GPT-6.1 Sol vs Gemini 3.8 Flash (Oct 2026)

Sonnet 4.5 retires Nov 30, 2026. Sonnet 5.5 vs GPT-6.1 Sol vs Gemini 3.8 Flash compared on price, benchmarks, and switching cost. Prices checked 12 Oct 2026.