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Tinley Park · September 9, 2026Fable 5.1 is quietly 45% cheaper to run #AI #Fable5 #Anthropic #APIbuilders #tokens
This video explains the cost efficiency of Fable 5.1, highlighting that while base token prices remain the same as Fable 5, the significant reduction in cache read costs makes it up to 45% cheaper for highly agentic workloads.
The outline
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Base Token Pricing
The video begins by clarifying that Fable 5.1 maintains the same base API billing rates as Fable 5, costing $10 per million input tokens and $50 per million output tokens.
Cache Read Cost Reduction
The speaker notes that cache read costs have dropped significantly from $1 to $25 per million tokens, which is a major benefit for enterprise users.
Overall Cost Savings
Anthropic estimates that typical workloads cost about 25% less than Fable 5, while highly agentic workloads that rely heavily on caching can see cost reductions of up to 45%.
For solo builders shipping agentic products, the drop in cache read fees matters more than the headline API price. Lower running costs for cached context make it easier to build and scale AI features without overestimating infrastructure spend.