Compare
Claude Fable 5 vs Claude Haiku 4.5
Input, output, and cached reads all scale by the same multiple between these two, so Claude Haiku 4.5 comes out 10.0× cheaper on every shape below — not just some of them. No traffic pattern flips this one.
Per million tokens
Claude Fable 5
Claude Haiku 4.5
Monthly cost by workload
Chat assistant
60,000 requests · 1,200 in / 400 out · 30% cached — short prompts, short answers, high volume
Claude Fable 5
$1,726
Claude Haiku 4.5
$172.56
Claude Haiku 4.5 is 10.0× cheaper on this shape — $1,553 a month.
RAG over documents
20,000 requests · 18,000 in / 700 out · 75% cached — large retrieved context, heavily cached prefix
Claude Fable 5
$1,870
Claude Haiku 4.5
$187.00
Claude Haiku 4.5 is 10.0× cheaper on this shape — $1,683 a month.
Coding agent
4,000 requests · 45,000 in / 6,000 out · 80% cached — long tool-calling loops, big cached prefix
Claude Fable 5
$1,704
Claude Haiku 4.5
$170.40
Claude Haiku 4.5 is 10.0× cheaper on this shape — $1,534 a month.