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[ARTICLE · art-24304] src=simonwillison.net ↗ pub= topic=artificial-intelligence verified=true sentiment=↑ positive

Setting a custom price for a model in AgentsView

Simon Willison reverse-engineered the AgentsView tool to set a custom price for the newly released Claude Fable 5 model, which was not yet included in the platform's pricing database. The workaround allows users to track token usage and costs for the new model across local coding projects, as demonstrated by a treemap visualization of Fable 5 usage.

read1 min publishedJun 9, 2026

TIL: Setting a custom price for a model in AgentsView I've been really enjoying AgentsView by Wes McKinney as a tool for exploring my token usage across different coding agents running on my laptop.

Claude Fable 5 came out today and wasn't yet included in the pricing database AgentsView uses. I used Fable to reverse-engineer AgentsView and figured out this recipe for setting custom prices.

Here's my Claude Fable 5 usage for today so far, plotted by AgentsView as a treemap across my different local projects:

Tags: ai, generative-ai, llms, llm-pricing, claude-mythos

source & further reading
simonwillison.net — original article OpenAI WebRTC Audio Session, now with document context Quoting Andrew Singleton Claude Fable is relentlessly proactive
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