My claim is that this is due to alignment
┌─────────────────┬──────────────┬───────────────┬────────────────────┬──────────────────────┐
│ Model │ Input ($/MTok)│ Output ($/MTok)│ Batch Input (−50%) │ Batch Output (−50%)│
├─────────────────┼──────────────┼───────────────┼────────────────────┼──────────────────────┤
│ Haiku 4.5 │ $1.00 │ $5.00 │ $0.50 │ $2.50 │
│ Sonnet 4.6 │ $3.00 │ $15.00 │ $1.50 │ $7.50 │
│ Opus 4.7 │ $5.00 │ $25.00 │ $2.50 │ $12.50 │
│ Opus 4.8 │ $5.00 │ $25.00 │ $2.50 │ $12.50 │
│ Fable 5 │ $10.00 │ $50.00 │ $5.00 │ $25.00 │
└─────────────────┴──────────────┴───────────────┴────────────────────┴──────────────────────┘
Prompt caching: −90% on input tokens (all models)