Tmux + Fable = Cut 35% less token

Cloud Quota and Model Usage Strategy00:00

Cloud quota burns out quickly when Fable 5 or GPT-5.6 So Max is used directly for all tasks. These frontier models are powerful but expensive and slow. The recommended practice is to use Fable 5 as the advisor or planner while using smaller models like Sonnet 5 as the executor. Sonnet 5 costs only 20% of Fable 5 but delivers performance nearly equivalent to Opus 4.8, the strongest model from a few months ago.

Two Official Approaches from Cloud Code00:31

Cloud Code officially demonstrates two methods. The first approach uses Sonnet 5 as the main executor agent and only calls Fable 5 as an advisor to review plans and provide advice. The second approach uses Fable 5 as the main agent that creates a plan and spins up worker agents using smaller models for execution.

Devin Fusion Harness Comparison01:00

Devin introduced a new harness called Devin Fusion that achieves similar or better performance than Fable 5 with 35% lower cost. Devin Fusion is fundamentally Cloud Code's Fable 5 orchestrator plus Sonnet 5 worker model. Devin compared the two Cloud Code methods and found that the Fable 5 orchestrator model works significantly better because advisor models require reading the full conversation history from the main agent rather than triggering cached context. Cached tokens cost only 10% of new input tokens, making the orchestrator approach more cost-efficient.

Sidekick Model vs Traditional Sub Agents02:01

Devin refers to persistent sub-agents as sidekicks. Traditional sub-agents in Cloud Code or Code X create new sessions on the fly, and when the main agent needs to make edits, a new task tool spins up a fresh sub-agent with no prior context. This wastes tokens by rewriting the same information repeatedly. Sidekick sessions are persistent, so follow-up messages from the main agent inherit all past context. Since cached tokens are extremely cheap yet powerful, this approach provides full context at minimal cost.