Fable 5.1 cuts cache reads 75%, making agentic workloads ~45% cheaper overall
rohanpaul_ai · x · 2026-09-02
Rohan Paul relays a16z interview comments from Gavin Baker: frontier labs always hold back more advanced checkpoints — with Fable 5.1 out, OpenAI's Astra could drop anytime.
His earlier analysis of Fable 5.1 pricing: cache reads cost 75% less than Fable 5. Agents constantly revisit the same context, plans, tool outputs and working state, so a 75% cut on one component translates to roughly 45% off the entire workload. The core enterprise economics question is now "how long can an agent keep working before the job stops making financial sense" — so this cost curve must keep falling.
Related event: OpenAI Previews Astra as gpt-6-astra Traces Multiply Ahead of Launch(85 posts)→
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