Codex sessions show "default" instead of the selected model, and web has no effort control

[webwww123]

Summary

When I create a new Codex session in the web UI and explicitly choose a model such as gpt-5.4, the session list/header still shows model: default.

That is confusing for two reasons:

1. I can't tell whether the chosen model was actually applied.
2. default/sonnet/opus looks like a Claude-style mode label, not a concrete Codex model name.

At the same time, the web UI currently exposes no way to choose Codex reasoning / thinking effort.

Repro

1. Open the web UI.
2. Create a new session.
3. Choose agent = Codex.
4. Choose model = GPT-5.4.
5. Start the session.
6. Go back to the session list or look at the session header.

Actual behavior

• The UI shows model: default.
• There is no Codex effort selector.

Expected behavior

• The session list/header should show the actual selected model (for example gpt-5.4) when one was provided.
• If the UI is showing a Claude-only modelMode, it should not be presented as if it were the actual model.
• Codex sessions should expose a reasoning effort selector if the backend supports it (auto/low/medium/high), or the UI should clearly indicate that effort selection is not supported yet.

Why this matters

In a multi-session workflow it becomes impossible to tell which Codex model is running, and the current default label makes it hard to trust what was actually launched.

[github-actions]

I verified this in the codebase, and the mismatch is real.

The selected Codex model is sent during session creation, so the launch path does appear to receive the concrete model you picked. In the web flow, the new-session form resolves the selected model and includes it in the spawn request (web/src/components/NewSession/index.tsx:222, web/src/components/NewSession/index.tsx:227). The hub spawn route accepts that model field (hub/src/web/routes/machines.ts:7, hub/src/web/routes/machines.ts:56), the runner forwards it as --model (cli/src/runner/run.ts:361), and the Codex app-server config includes model in thread/turn params when present (cli/src/codex/codexRemoteLauncher.ts:658, cli/src/codex/codexRemoteLauncher.ts:703, cli/src/codex/utils/appServerConfig.ts:107, cli/src/codex/utils/appServerConfig.ts:153).

The reason the UI still shows default is that the session list/header are rendering session.modelMode, not the actual selected model (web/src/components/SessionList.tsx:262, web/src/components/SessionHeader.tsx:142). That field is a Claude-style enum (default|sonnet|opus) (shared/src/modes.ts:28) and is the only model-like field included in SessionSummary (shared/src/sessionSummary.ts:22, shared/src/sessionSummary.ts:51). I did not find any stored session metadata field for the concrete Codex model; MetadataSchema has IDs/flavor/path, but no model property (shared/src/schemas.ts:22). Also, model-mode changes are explicitly limited to Claude sessions (shared/src/modes.ts:105, hub/src/web/routes/sessions.ts:277).

For effort: the Codex app-server types do define TurnStartParams.effort (cli/src/codex/appServerTypes.ts:105, cli/src/codex/appServerTypes.ts:112), but I did not find web or hub plumbing for it. The web new-session flow has model/yolo/sessionType/worktreeName, but no effort field (web/src/components/NewSession/index.tsx:223, hub/src/web/routes/machines.ts:7), and the Codex turn builder sets approval/sandbox/model/collaborationMode only, with no effort assignment (cli/src/codex/utils/appServerConfig.ts:125, cli/src/codex/utils/appServerConfig.ts:153).

Relevant code:

• web/src/components/NewSession/index.tsx:222 - resolves selected model before spawn
• hub/src/web/routes/machines.ts:56 - spawn route forwards model
• cli/src/runner/run.ts:361 - runner appends --model
• cli/src/codex/utils/appServerConfig.ts:107 - thread params include selected model
• cli/src/codex/utils/appServerConfig.ts:153 - turn params include selected model
• web/src/components/SessionList.tsx:262 - list renders s.modelMode || 'default'
• web/src/components/SessionHeader.tsx:142 - header renders session.modelMode || 'default'
• shared/src/sessionSummary.ts:22 - summary only exposes modelMode
• shared/src/schemas.ts:22 - session metadata schema has no concrete model field
• cli/src/codex/appServerTypes.ts:112 - Codex turn params support effort
• cli/src/codex/utils/appServerConfig.ts:125 - current turn builder does not wire effort

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