Teknium: Switching Models Mid-Session Kills Prompt Caches and Doubles Costs

Nous Research's Teknium warns that switching models mid-session invalidates the prompt cache on the new model, forcing full re-payment of all input tokens—so avoid it unless the model is free.

2026-08-25 ~ 2026-08-26 · 4 related posts

• Switching models constantly invalidates prompt cache and doubles costs — Teknium · 2026-08-25
• Switching models frequently invalidates prompt cache, causing double billing — daniel_mac8 · 2026-08-25
• Teknium: switching models mid-session invalidates your prompt cache, pay full input price again — adrianscottcom · 2026-08-26

1 near-duplicate retellings: Daniel_Farinax