An alternative to Jev for Codex
Jev for Codex (the jev-codex command of jev-router) chooses which Codex model answers each new turn. AgentsRoom does the same job from its composer, with Adaptive Mode, and keeps your Codex agents in a workspace around them.
Both send easy work to a light model and hard work to the flagship, through a small local server that changes the model without restarting Codex. The difference is around it: Jev is a command you launch, AgentsRoom builds it into the app that runs your agents.
Two ways to stop paying flagship prices for small tasks
Jev for Codex
- Open source (MIT), installed from npm as jev-router
- jev-codex launches the real Codex CLI with a temporary Jev Router provider
- A loopback proxy forwards Codex requests to OpenAI and picks a model at each new user turn
- Tool-loop continuations keep the model chosen at the start of the turn
- Needs a TypeSafe API key; your prompt text is sent to TypeSafe to decide
- Works in any terminal, on Windows, macOS and Linux
AgentsRoom
- Adaptive Mode, opt-in, built into the desktop app
- Suggests the cheapest Codex model that can still do the task, from the message you type
- Every message option: each message is analysed, not only the first one
- Automatic option: the model changes before your message is sent, without restarting Codex
- Built in: Codex is connected to a local server inside the app at launch, with your own login and no third-party key
- The agent keeps its tab: status, history, messaging, MCP, several Codex accounts
Same principle, built in or added on
Codex has no command that changes the model in the middle of a session: its /model only opens a picker. Both tools get around it the same way, with a small local server between Codex and the API.
Jev: a command that wraps Codex
You start Codex with jev-codex instead of codex. It launches a loopback proxy and a temporary Jev Router provider; the proxy rewrites each new turn to the model Jev picked, and a commentary line tells you which one. Routing needs a TypeSafe key, and the prompt text of the turn goes to TypeSafe.
AgentsRoom: the same idea, inside the app
In Automatic mode, AgentsRoom starts each Codex agent connected to a small local server inside the app, keeping your Codex login. When your message calls for another model, the next requests go to it: no relaunch, nothing typed in Codex. An agent that was already running, an agent on a remote SSH host, or a Codex that goes through your own provider or endpoint is never rerouted: it switches by resuming the same conversation on the new model.
Neighbouring questions, answered on their own pages
AgentsRoom vs Jev for Codex at a glance
The first rows are where Jev is ahead. The rest is what surrounds a Codex agent once it runs.
| Feature | AgentsRoom | Jev for Codex |
|---|---|---|
| Open source | ✗ | ✓ |
| Refuses a downgrade that would waste the prompt cache | ✗ | ✓ |
| Works in a plain terminal, outside any app | ✗ | ✓ |
| Explains the last routing decision | ✗ | ✓ |
| Changes model without restarting Codex | ✓ | ✓ |
| Picks a model for each message | Option | Per turn |
| Switches an agent that was already running | Resumes the session | ✗ |
| No third-party API key to manage | ✓ | TypeSafe key |
| Can suggest instead of switching | ✓ | ✗ |
| Routes other CLIs too | Claude, Antigravity | Claude Code |
| Several Codex accounts side by side | ✓ | ✗ |
| Desktop interface | ✓ | ✗ |
| Agent status at a glance | ✓ | ✗ |
| Live terminal per agent | ✓ | Your terminal |
| Multi-project view | ✓ | ✗ |
| Kanban backlog | ✓ | ✗ |
| Built-in diff review | ✓ | ✗ |
| Specialized agent roles | ✓ | ✗ |
| Notifications | ✓ | ✗ |
| Native mobile app | ✓ | ✗ |
| Settings in an interface | ✓ | ✗ |
| Drag and drop files | ✓ | ✗ |
| Model choice | Per agent + per message | Per turn |
| Setup | 30 sec | npm + API key |
What AgentsRoom does not do
Per-message routing in AgentsRoom has limits of its own. Better to know them before you switch.
Restart the agents that were already open
Automatic switches without a relaunch for the agents started after you turn it on. An agent already open still switches, by resuming the same conversation on the new model, which takes a few seconds. Restart it once to get the switch without relaunch.
No routing in the middle of a turn
A message sent while the agent is still working is not routed: the switch could only apply after the turn. A message waits at most 4 seconds for the verdict, then leaves on the current model.
The prompt cache is not protected
Changing model drops the prompt cache of the previous one: the first message on the new model re-reads the history at full price. Jev refuses a downgrade on a large conversation when it would cost more than it saves; AgentsRoom does not.
Only inside AgentsRoom
Routing applies to the agents you run in AgentsRoom, from the desktop or the phone. A codex you start in another terminal keeps its model. The first 500 characters of your message are sent to AgentsRoom's servers to decide.
When Jev for Codex is the better choice
Jev is a good tool, and in these cases it fits better than AgentsRoom.
You live in a plain terminal
You run codex in your own shell or over SSH and want routing there, without a desktop app around it.
You want to set each tier yourself
Jev lets you choose which Codex model serves each tier, and asking for a tier in the prompt, such as use strong, overrides the routing for that turn.
You want the cache-aware guard
On a large conversation Jev refuses a downgrade that would waste more prompt cache than it saves, and its explain command shows the scores behind each decision.
You want code you can read and change
jev-router is open source under the MIT license: you can read the routing policy, change it and fork it.
Per-message routing for Codex in AgentsRoom
Three settings in Settings > Composer. They can also be set for one project only.
Turn Adaptive Model on
Settings > Composer > Adaptive Model > On. Off by default; while off, nothing is sent.
Analyse every message
Turn on Every message. By default only the first message of a conversation is analysed.
Choose Automatic
Set When a better-suited model is found to Automatic. Agents started from then on switch model without a relaunch; the chip says which model was used, and the thumbs rate the choice.
Try AgentsRoom in your browser
The real desktop app, running in your browser with sample data. Nothing to install.
The desktop app, in Simple mode
On a phone the demo runs the real desktop app in its Simple interface mode: one project, its agents, one prompt. The full cockpit is on your computer.
Frequently asked questions
Is AgentsRoom an alternative to Jev for Codex?
How does AgentsRoom change the Codex model in the middle of a conversation?
Do I need to install anything or add an API key?
Does it route every message, or only the first one?
What is sent to make the decision?
How many routing decisions are included?
Does switching model cost anything in tokens?
Is Jev for Codex the same tool as Jevia?
I use Jev with Claude Code too. Is there a comparison for that?
Other comparisons
AgentsRoom compared with other agent managers, terminals and AI tools.
Route each Codex message to the right model
Free download for macOS, Windows and Linux. Turn on Adaptive Model and pick Every message.
Companion app: monitor your agents on the go
Bring your own: Claude, Codex, Antigravity CLI, or other AI provider.
Push bugs and requests straight to your public backlog.