LLM API Comparison & Cost·SEPTEMBER 28, 2026
Claude Opus 5.5: 40% Lower Compute Costs, Comparable Performance
Claude Opus 5.5 costs $4 per million input tokens and $20 per million output tokens, with Anthropic citing roughly 40% lower compute and running costs compared to Opus 5. It matches Claude Fable 5.1 performance on most tasks, generates output about 30% faster, and keeps the…
