Caster Launches 'NEO Accounting': AI Executes Accounting via Slack Commands. Entering an Era Where AI Completes Bookkeeping.
Caster has released 'NEO Accounting', a service where AI automatically executes accounting processes via Slack commands by integrating Claude and freee.
📋 Article Processing Timeline
- 📰 Published: April 24, 2026 at 19:00
- 🔍 Collected: April 24, 2026 at 10:31
- 🤖 AI Analyzed: April 25, 2026 at 02:59 (16h 27m after Collected)
Caster Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; CEO: Shota Nakagawa; hereinafter 'Caster'), which realizes corporate business transformation and productivity improvement through AI x BPaaS, started offering 'NEO Accounting' on April 24, 2026, a new service where AI automatically executes accounting processes triggered by instructions on Slack.
Accounting tasks that have traditionally been performed by humans operating accounting software are evolving into a system directly executed by AI. This does not merely stop at improving efficiency, but drastically changes the nature of the operations themselves.
■ Background: Accounting operations are reaching their limits while remaining in a 'human-dependent structure'
For a long time, corporate accounting operations have been premised on humans operating accounting software and making individual judgments to process transactions. However, against the backdrop of a declining workforce and human resource shortages, hiring accounting personnel has become difficult. With tasks concentrated on specific individuals, operations become highly personalized and opaque, making stable operation itself a challenge.
Furthermore, while interest in utilizing AI is growing, challenges remain such as handling complex journal entries, exception processing, ensuring accuracy, and addressing security concerns. Although introduction at a practical level is progressing, the reality is that the number of companies fully mastering it in the field is still limited.
Since its founding in 2014, Caster has been providing back-office operational support. In the accounting domain, through 'CASTER BIZ accounting,' we have taken charge of practical operations and promoted the standardization and templating of complex operational flows. Based on the knowledge and know-how accumulated through these practical operations, we have developed this service by designing a state where 'AI can execute operations.'
These initiatives transform the very nature of accounting operations from 'tasks processed by humans' to a 'mechanism that runs automatically.'
■ Service Overview: AI "executes" accounting operations
'NEO Accounting' is a service where AI does not just assist with accounting operations but takes on the execution itself.
Triggered by instructions on Slack, the AI determines the processing method and directly operates the accounting software to execute the transaction. A series of processes up to the monthly closing is completed automatically; unlike conventional methods where a person needs to log into a system to perform the work, accounting processing is completed simply by giving a business instruction.
The AI utilizes Claude, and through API integration (MCP) with the accounting software freee, automates the process from business instruction to execution. Furthermore, for accounting operations which are unstable with general-purpose AI alone, 'Castcore', a system uniquely developed by Caster, acts as a supplement. It handles complex decision branching and exception processing, realizing stable processing at a practical level.
We plan to expand the supported software and scope of application in the future.
Click here for details of this service.
The diagram below illustrates the difference between traditional accounting operations and this service.
■ Features
NEO Accounting is designed under the premise of utilizing AI at a practical level. It possesses features distinct from conventional AI utilization, particularly in the following areas:
Design where AI "executes" tasks
Not assistance, but consistently executing processes up to the monthly closing.
Reproducibility through task standardization
Designing complex accounting tasks into a standardized format that AI can process.
Safety through authorization design
Clarifying the scope of what AI can execute to control risks.
Quality assurance by AI x Human
Maintaining accuracy through verification at the time of introduction and checks during operation.
■ Introduction Effects
By introducing NEO Accounting, accounting operations will change as follows:
From monthly processing to daily processing
Realizing an environment where the latest figures can always be grasped.
From personalization to standardization
Building an operational structure that does not depend on a specific person in charge.
From human processing to AI automatic driving (AI judges and executes optimal processing)
Realizing cost reduction by decreasing processing labor hours.
■ Recommended for These Companies
This service can be widely utilized by companies considering the efficiency and automation of accounting operations.
It is particularly effective in companies where accounting tasks are highly personalized to individuals, or companies operating back offices with limited personnel.
It is also suitable for companies that are interested in business substitution by AI but do not know how to incorporate it into practical operations.
■ Pricing
NEO Accounting adopts a pricing structure divided into a design phase at introduction and an operational phase.
● Onboarding Period (Introduction/Design)
Period: 3-6 months
Price: ¥7,500/hour (¥8,250 including tax)
Details:
Organizing operational flows, standardization, design and environment construction for AI execution.
● Operational Period (Monthly)
Monthly fee: From ¥130,000 (¥143,000 including tax)
Breakdown:
System usage fee (Server/AI usage fee)
Automatic driving of accounting processing by AI
Quality checks by humans (Sa
Accounting tasks that have traditionally been performed by humans operating accounting software are evolving into a system directly executed by AI. This does not merely stop at improving efficiency, but drastically changes the nature of the operations themselves.
■ Background: Accounting operations are reaching their limits while remaining in a 'human-dependent structure'
For a long time, corporate accounting operations have been premised on humans operating accounting software and making individual judgments to process transactions. However, against the backdrop of a declining workforce and human resource shortages, hiring accounting personnel has become difficult. With tasks concentrated on specific individuals, operations become highly personalized and opaque, making stable operation itself a challenge.
Furthermore, while interest in utilizing AI is growing, challenges remain such as handling complex journal entries, exception processing, ensuring accuracy, and addressing security concerns. Although introduction at a practical level is progressing, the reality is that the number of companies fully mastering it in the field is still limited.
Since its founding in 2014, Caster has been providing back-office operational support. In the accounting domain, through 'CASTER BIZ accounting,' we have taken charge of practical operations and promoted the standardization and templating of complex operational flows. Based on the knowledge and know-how accumulated through these practical operations, we have developed this service by designing a state where 'AI can execute operations.'
These initiatives transform the very nature of accounting operations from 'tasks processed by humans' to a 'mechanism that runs automatically.'
■ Service Overview: AI "executes" accounting operations
'NEO Accounting' is a service where AI does not just assist with accounting operations but takes on the execution itself.
Triggered by instructions on Slack, the AI determines the processing method and directly operates the accounting software to execute the transaction. A series of processes up to the monthly closing is completed automatically; unlike conventional methods where a person needs to log into a system to perform the work, accounting processing is completed simply by giving a business instruction.
The AI utilizes Claude, and through API integration (MCP) with the accounting software freee, automates the process from business instruction to execution. Furthermore, for accounting operations which are unstable with general-purpose AI alone, 'Castcore', a system uniquely developed by Caster, acts as a supplement. It handles complex decision branching and exception processing, realizing stable processing at a practical level.
We plan to expand the supported software and scope of application in the future.
Click here for details of this service.
The diagram below illustrates the difference between traditional accounting operations and this service.
■ Features
NEO Accounting is designed under the premise of utilizing AI at a practical level. It possesses features distinct from conventional AI utilization, particularly in the following areas:
Design where AI "executes" tasks
Not assistance, but consistently executing processes up to the monthly closing.
Reproducibility through task standardization
Designing complex accounting tasks into a standardized format that AI can process.
Safety through authorization design
Clarifying the scope of what AI can execute to control risks.
Quality assurance by AI x Human
Maintaining accuracy through verification at the time of introduction and checks during operation.
■ Introduction Effects
By introducing NEO Accounting, accounting operations will change as follows:
From monthly processing to daily processing
Realizing an environment where the latest figures can always be grasped.
From personalization to standardization
Building an operational structure that does not depend on a specific person in charge.
From human processing to AI automatic driving (AI judges and executes optimal processing)
Realizing cost reduction by decreasing processing labor hours.
■ Recommended for These Companies
This service can be widely utilized by companies considering the efficiency and automation of accounting operations.
It is particularly effective in companies where accounting tasks are highly personalized to individuals, or companies operating back offices with limited personnel.
It is also suitable for companies that are interested in business substitution by AI but do not know how to incorporate it into practical operations.
■ Pricing
NEO Accounting adopts a pricing structure divided into a design phase at introduction and an operational phase.
● Onboarding Period (Introduction/Design)
Period: 3-6 months
Price: ¥7,500/hour (¥8,250 including tax)
Details:
Organizing operational flows, standardization, design and environment construction for AI execution.
● Operational Period (Monthly)
Monthly fee: From ¥130,000 (¥143,000 including tax)
Breakdown:
System usage fee (Server/AI usage fee)
Automatic driving of accounting processing by AI
Quality checks by humans (Sa