2026 AI Model Cost Comparison: GPT-5.5, Claude Opus 4.8, Gemini 3.0 and More
2026 comprehensive AI model pricing comparison featuring GPT-5.5 Ultra, Claude Opus 4.8, Gemini 3.0 Ultra, DeepSeek R1 and reasoning models with practical budgeting checks, cost drivers, validation steps, and examples for production AI teams.