Hopper
Hi HN, we’re Sai and Aayush, and we’re building Hypercubic (https://www.hypercubic.ai/), bringing AI tools to the mainframe and COBOL world. (We did a Launch HN last year: https://news.ycombinator.com/item?id=45877517.) Today we’re launching Hopper, an agentic development environment for mainframes. You can download it here: https://www.hypercubic.ai/hopper, and you can also request access and immediately get a mainframe user account to play with. There's also a video runthrough at https://www.youtube.com/watch?v=q81L5DcfBvE.…
Hopper launched on May 12, 2026 with 100 votes, #318 of 20,539 launches that month and more than 95% of that year's launches.
In plain words
Hopper is an agentic development environment designed for mainframe and COBOL systems. It brings AI tools to legacy mainframe platforms that power critical infrastructure in banking, payments, insurance, and government sectors. The platform allows developers to interact with and develop for mainframes through an AI-assisted interface, addressing the challenge of maintaining and updating decades-old systems that continue to handle massive transaction volumes at large institutions.
written from the facts on this page · September 2026
From the sources
Hopper is the first agentic development environment for the mainframe. It's Cursor for mainframes. It combines a real TN3270 terminal, mainframe-aware panels for datasets, jobs, members, and spool output, and an AI agent that can operate across z/OS workflows. The agent can inspect datasets, read and edit PDS members, write JCL, submit jobs, parse JES output, explain failures, and help developers debug mainframe workflows faster. Hopper is available on Windows, Linux, and macOS.
Hopper is an agentic TN3270 terminal emulator. AI agents navigate ISPF, write column-strict JCL, debug failed jobs and query VSAM inside z/OS.
Use AI agents to navigate TN3270, inspect datasets, write JCL, debug jobs, query VSAM, and operate inside z/OS from a modern development environment. Drives ISPF by panel ID, writes column-strict JCL, decodes spool failures into structured diagnostics, and queries VSAM as SQL. Drives the JCL, parses JES return codes, NEWCOPYs into CICS, and pauses for your approval before every change. Hours of SDSF triage in one @-tag. The agent decodes JESMSGLG, JESYSMSG, and SYSUDUMP into the abend code, failing step, and source line. Works exactly like the TN3270 you've used for years. Full PF, PA, and attention-key support. Hopper is a desktop application for z/OS engineers that bundles a TN3270…from hypercubic.ai
In the maker’s words, at launch
Hi HN, we’re Sai and Aayush, and we’re building Hypercubic (https://www.hypercubic.ai/), bringing AI tools to the mainframe and COBOL world. (We did a Launch HN last year: https://news.ycombinator.com/item?id=45877517.) Today we’re launching Hopper, an agentic development environment for…
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