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How to let Codex plan while a local model does the edits (Slipstream) with Open Jet

Connect your ChatGPT Codex subscription or OpenRouter as the planner and let OpenJet's local model do the work.

Short answer: Install and set up OpenJet with pipx install open-jet and openjet setup; then inside OpenJet run /connect openai-codex (or /connect openrouter); Switch with /mode to Slipstream. All steps.

Who it is forA developer who wants frontier-model planning but hits plan limits on long coding sessions.

The problemFrontier models burn through quotas when they read the whole repo and run every test themselves.

The outcomeA frontier model that plans and reviews while the local model edits files and runs tests, using about 20% of the tokens.

What you need first

  • Linux with an NVIDIA RTX 30, 40 or 50 GPU with 24 GB+ and CUDA 12+ for the megakernel; other hardware uses llama.cpp
  • Recommended: 14 GB+ VRAM or Apple silicon with 24 GB+; CPU-only works
  • pipx

Steps

  1. Install and set up OpenJet with pipx install open-jet and openjet setup
  2. Inside OpenJet run /connect openai-codex (or /connect openrouter)
  3. Switch with /mode to Slipstream
  4. Give it a task; the local model reads the repo, edits files and runs tests
  5. Review the frontier model's review of the local model's conclusions

Prompt for your agent

Set up L-Forster/open-jet in Slipstream mode with my Codex subscription as planner and the local model as worker, then do <task> in <repo> and report tokens used by the planner.

Caveat. This card is written from the L-Forster/open-jet README, not from a test run by Deduped. Before you start, make sure you have Linux with an NVIDIA RTX 30, 40 or 50 GPU with 24 GB+ and CUDA 12+ for the megakernel. Check the repo for newer instructions before you rely on these steps.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for L-Forster/open-jet and "Let Codex plan while a local model does the edits (Slipstream)"

Add Deduped to Claude Code once

claude mcp add --transport http deduped https://dedupedai.com/mcp

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