Abi cuts Claude costs from 40,000 yen to 3,000 yen per month by redesigning prompts and sessions
Abi, an AI company, reduced its monthly Claude API bill from about 40,000 yen to roughly 3,000 yen by restructuring how it uses the model. The shift involved splitting long, consolidated conversation sessions—some spanning website production, social media, notes, videos, apps, and automation—into separate projects. Instead of passing entire company histories to Claude, the team now limits…
What you can do with it
AI at Work →Manage customer support chats with Claude API
What you get You can track project-specific notes.
Separate conversations.
- Who for
- marketers, founders, support teams and operations
- Cost
- included in a tool you already have
- Effort
- minutes
- Already included in
- Pro plan (~3,000 yen/month)
Use it for
- Manage customer support chats
- Draft marketing content
- Track project-specific notes
How to set it up · From the article
- Split existing long sessions into project-specific chats (e.g., marketing, support, ops).
- Edit instruction files to include only current status, recent decisions, and task-specific data.
- Replace full history handovers with ‘diffs’: changes since last time, finalized items, and next steps.
Watch out Requires manual session reorganization; no automated tool provided by Claude
Key points from the news
- Abi cut Claude costs from ~40,000 yen to ~3,000 yen/month by splitting sessions and trimming context
- Long sessions included unrelated tasks like website production, social media, and automation in one chat
- Team now limits Claude prompts to current status, recent decisions, and task-specific data only
The change came after Abi initially assumed automation volume drove costs but found that massive, long-running sessions—carrying accumulated context—were the real culprit. By adopting a ‘diffs’ handover format (changes since last time, finalized items, and next steps) and excluding irrelevant historical details, Abi cut unnecessary token usage. The company notes its internal tool, Abi Core, helps manage these workflows but is still under development. While the 3,000 yen plan may not suffice indefinitely, the redesign allowed Abi to continue operations without upgrading plans.
Reducing Claude costs from 40,000 yen to 3,000 yen per month: Changes made to reduce tokens without disrupting AI company operations
note.com · 22 September 2026
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