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Arena analyzes 26,225 Agent sessions: without caching, agent costs are 3.6 times higher
Arena analyzed 26,225 Agent sessions, 30 agents, and 13 labs from September 12 to October 23, 2026, and found that if billed at the full input price, the typical task cost for the top ten agents would be 3.6 times higher, and 592% higher on MiMo V2.6 Pro. For agents, 86% to 96% of tokens are repeatedly read context, while their own output accounts for only 1% to 2%. Cache invalidation increases the typical task cost by about 5%, and on Claude Fable 5.1, 1 in every 10 sessions sees an increase of more than 18%.
Arena analyzed 26,225 Agent sessions, 30 agents, and 13 labs from September 12 to October 23, 2026, and found that if billed at the full input price, the typical task cost for the top ten agents would be 3.6 times higher, and 592% higher on MiMo V2.6 Pro. For agents, 86% to 96% of tokens are repeatedly read context, while their own output accounts for only 1% to 2%. Cache invalidation increases the typical task cost by about 5%, and on Claude Fable 5.1, 1 in every 10 sessions sees an increase of
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Google research team proposes Sleep Framework, enabling large models to learn while in use without forgetting old knowledge
The Google research team has released a continual learning study called the "Sleep Framework," which divides model operation into two phases—awake and sleep—to address the problem of large models' rigid knowledge and difficulty in absorbing new information. The sleep phase writes short-term context into long-term parameters through parameter expansion, mixture-of-experts memory blocks, and knowledge distillation, and generates synthetic samples via "dreaming" for reinforcement learning. Experiments show that the framework can handle contexts of up to about 10 million tokens, that performance degradation is close to zero in multi-stage continual learning on unseen languages, and that it achieves higher accuracy on mathematical benchmarks such as AIME 24/25.
The Google research team has released a continual learning study called the "Sleep Framework," which divides model operation into two phases—awake and sleep—to address the problem of large models' rigid knowledge and difficulty in absorbing new information. The sleep phase writes short-term context into long-term parameters through parameter expansion, mixture-of-experts memory blocks, and knowledge distillation, and generates synthetic samples via "dreaming" for reinforcement learning. Experime
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