fix(codex): gate models on the Codex CLI floor before the ChatGPT backend rejects them (#15399)

## Thinking Path

> - Paperclip is the open source app people use to manage AI agents for
work
> - The Codex adapter and the native runner run Codex in local hosts and
in managed sandboxes, and the model catalog lists the models an operator
can select
> - The Codex backend accepts a new model with ChatGPT sign-in only from
a recent enough Codex CLI. An older CLI fails every turn with `The
'<model>' model is not supported when using Codex with a ChatGPT
account.`
> - After #14942 added `gpt-6.1-sol`, an operator selected it for an
agent in a managed Daytona sandbox. The sandbox image still shipped
Codex 0.156.0. The connection test and runs failed with that sentence,
which reads like an account problem
> - Paperclip only checked the Codex compatibility window (`>=0.149.0
<0.161.0`), so 0.156.0 passed and the failure surfaced from the backend
without a cause
> - This pull request records the verified Codex CLI floor for each
gated model, compares the installed `codex --version` with that floor in
the environment Test and in the remote runner, and names the backend
rejection when it still happens
> - The benefit is a precise, actionable message ("gpt-6.1-sol requires
Codex CLI 0.159.0 or newer; detected 0.156.0; promote a sandbox image
with Codex 0.160.0") instead of an opaque 400, and no doomed hello probe

## Linked Issues or Issue Description

Refs #14942

**Bug: selecting `gpt-6.1-sol` in a managed sandbox fails with a ChatGPT
account error.**

**Steps to reproduce**
1. Promote a sandbox image that ships Codex CLI 0.156.0.
2. Create a Codex agent with a ChatGPT sign-in connection, select
`gpt-6.1-sol`, and run the environment Test or a task in that sandbox.

**Expected behavior**
The Test or the run tells the operator that the Codex CLI in the sandbox
is older than the model needs.

**Actual behavior**
The Test reports `codex_hello_probe_failed` with
`{"type":"error","status":400,"error":{"type":"invalid_request_error","message":"The
'gpt-6.1-sol' model is not supported when using Codex with a ChatGPT
account."}}`. A run fails with "The selected model is not supported by
the current ChatGPT connection."

**Evidence**
- Codex 0.156.1 and older are rejected for `gpt-6.1-sol` with ChatGPT
sign-in: https://github.com/openai/codex/issues/49396
- Codex 0.159.0 and 0.159.2 are accepted:
https://github.com/openai/codex/issues/49464 and
https://github.com/decolua/9router/issues/4471 (same error, fixed by
raising the client version identity from 0.155.0 to 0.159.0)
- Codex 0.157.0 release notes: "Add GPT-6 Sol and Luna to the model
catalog": https://github.com/openai/codex/releases/tag/rust-v0.157.0
- GPT-6.1 Sol is included for Plus, Pro, Business, Enterprise, and Edu
with ChatGPT sign-in: https://learn.chatgpt.com/docs/models

## What Changed

- `packages/adapters/codex-local/src/index.ts`: add
`minimumCodexCliVersionForModel` (`gpt-6.1-sol` → 0.159.0, `gpt-6-sol`
and `gpt-6-luna` → 0.157.0, with the sources above),
`parseCodexCliVersionOutput`, `codexCliVersionAtLeast`, and
`CODEX_CHATGPT_MODEL_REJECTION_RE`. Models without a verified floor
return `null`, so nothing probes them. The agent configuration doc
describes the floors.
- `packages/adapters/codex-local/src/server/cli-version.ts` (new): run
`codex --version` where the run would execute it (local, SSH, or
sandbox), compare it with the model floor, and build the
`codex_cli_version_compatible` / `codex_cli_version_incompatible`
checks. Map the backend rejection sentence to
`codex_hello_probe_model_rejected` with the detected CLI version and a
hint that separates a stale CLI from a plan that does not include the
model.
- `packages/adapters/codex-local/src/server/test.ts` (CLI lane Test):
run the version check before the hello probe when the model has a floor.
Skip the hello probe when the CLI is too old
(`codex_hello_probe_skipped_cli_version`). When the probe still fails
with the backend sentence, report `codex_hello_probe_model_rejected`
instead of the generic `codex_hello_probe_failed`. The new codes do not
match the auth-failure patterns, so a managed connection is not
invalidated.
- `packages/adapters/codex-local/src/server/acp.ts` (ACP lane Test): for
remote targets, run the same version check against the shared `codex`
the ACP server spawns.
- `server/src/services/native-runtime/native-session-executor.ts`: after
the compatibility-window check, compare the remote Codex with the
configured model's floor and fail with
`runner_remote_provider_artifact_incompatible: <model> requires Codex
<floor> or newer with ChatGPT sign-in, received <version> from the
sandbox image; promote a sandbox image with Codex 0.160.0 or configure
PAPERCLIP_RUNNER_REMOTE_CODEX_NPM_SPEC=...`. When a preinstalled Codex
fails this check and an npm spec is configured, the existing fallback
installs the pinned release.
- Tests: adapter metadata, CLI-lane Test (too old, compatible, no floor,
backend rejection), ACP-lane Test (too old, compatible, no floor), and
the remote runner floor (nine version/model cases).
- `doc/adapter-model-audit-2026-10-02.md`: record the floors and the
reason.

No catalog entry, default model, saved agent configuration, pin,
lockfile, or image definition changes.

## Verification

Local (Node 25.9, pnpm 9.15.4 via corepack):

```sh
pnpm --filter @paperclipai/adapter-codex-local typecheck
pnpm --filter @paperclipai/adapter-codex-local exec vitest run            # 81 passed
pnpm --filter @paperclipai/server exec vitest run \
  src/services/native-runtime/native-session-executor.test.ts \
  src/services/native-runtime/codex-runtime-compatibility.test.ts -t Codex   # 84 passed
```

Also run locally: the full `native-session-executor.test.ts` file (533
passed) and the full Codex adapter suite (81 passed).

Follow-up commit `9fd4d3b25` (Greptile P2: the ACP-lane version probe
ignored the agent's configured env): the probe now receives the
adapter's string-valued `env` entries, the same ones
`buildCodexAcpConfig` hands to remote ACP runs, so a `PATH` override
selects the same `codex` for the Test as for the run. New test covers a
`PATH` + `CODEX_HOME` override and a dropped non-string entry. Re-run on
that head: `pnpm --filter @paperclipai/adapter-codex-local typecheck`
clean; full Codex adapter suite 503 passed (31 files).

Not run here: `pnpm -r typecheck` for `server` (the direct `tsc
--noEmit` was killed by the sandbox memory cap; the adapter package
typecheck passes and CI covers the server), `pnpm build`, browser
suites, and a live sandbox probe. No UI files changed, so token gates do
not apply.

Manual check for a reviewer: set an agent's Codex model to
`gpt-6.1-sol`, point its environment at a sandbox whose `codex
--version` prints `codex-cli 0.156.0`, and run the environment Test. The
result contains `codex_cli_version_incompatible` with `Detected Codex
CLI 0.156.0.` and no hello probe check. With Codex 0.160.0 the Test
contains `codex_cli_version_compatible` and runs the hello probe.

## Risks

- A floor is enforced for all authentication modes, because the runner
does not know the credential method at verification time. An OpenAI API
key on Codex 0.157.0 or 0.158.0 with `gpt-6.1-sol` is now rejected
before launch. Paperclip pins Codex 0.160.0 everywhere, so this only
affects installs that lag the pin, and the message names the fix.
- The 0.159.0 floor for `gpt-6.1-sol` is the oldest stable release
verified to work; 0.157.0 and 0.158.0 were not verified either way. If
OpenAI accepts an older client, the floor can be lowered in one table.
- The `codex --version` probe adds one short process run to the Test
only for models with a floor.
- Rollback: revert this pull request. No data or configuration migrates.

## Model Used

Claude Fable 5.1 (`claude-fable-5-1`), Anthropic, with extended
thinking, tool use, and web research, operating as a Paperclip agent
through Claude Code.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change (e.g. `docs/...`, `fix/...`)
and contains no internal Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [ ] All Paperclip CI gates are green
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Bender (Fable) <noreply@paperclip.ing>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
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@@ -11968,6 +11968,95 @@ describe("runnerd provider runtime wiring", () => {
).toBe(false);
});
it.each([
{ version: "0.156.0", model: "gpt-6.1-sol", floor: "0.159.0" },
{ version: "0.158.0", model: "gpt-6.1-sol", floor: "0.159.0" },
{ version: "0.156.0", model: "gpt-6-sol", floor: "0.157.0" },
{ version: "0.156.0", model: "gpt-6-luna", floor: "0.157.0" },
{ version: "0.159.0", model: "gpt-6.1-sol", floor: null },
{ version: "0.160.0", model: "gpt-6.1-sol", floor: null },
{ version: "0.157.0", model: "gpt-6-sol", floor: null },
{ version: "0.156.0", model: "gpt-5.6-sol", floor: null },
{ version: "0.156.0", model: null, floor: null },
])("rejects a sandbox Codex $version below the ChatGPT floor for $model before launch (floor=$floor)", async ({ version, model, floor }) => {
// A preinstalled Codex inside the compatibility window can still be too
// old for the configured model: the ChatGPT backend rejects every turn
// with "not supported when using Codex with a ChatGPT account". The
// verifier names the stale image instead of letting the run fail as an
// account problem.
const gatedExecution = {
...execution,
provider: { kind: "codex", model, approvalPolicy: "never" },
binding: { ...execution.binding, runId: `run-codex-floor-${version}-${model ?? "default"}` },
} as NativeExecutionInputV1;
const onLog = vi.fn(async () => undefined);
const syncIn = vi.fn(async () => undefined);
const remoteExecute = vi.fn(
async (command: { command: string; args?: string[] }) => {
let stdout = "";
const script = command.args?.[1] ?? "";
if (command.args?.[0] === "--build-metadata") {
stdout = JSON.stringify({
schema: "paperclip-runner/runnerd-build-metadata/v1",
binaryName: "paperclip-runnerd",
packageName: "@paperclipai/paperclip-runner",
binaryContractVersion: 2,
durableSessionCapabilities: ["unlimited_runtime", "connection_lease_renewal"],
prpTransportModes: ["listen_ws"],
});
} else if (command.args?.[0] === "--version") {
if (command.command.endsWith("/.paperclip-runtime/paperclip-runner/bin/codex")) {
throw new Error("reached-preinstalled-codex-verification");
}
stdout = `codex-cli ${version}`;
} else if (script === "uname -s; uname -m") {
stdout = `${process.platform === "darwin" ? "Darwin" : "Linux"}\n${process.arch === "arm64" ? "arm64" : "x86_64"}\n`;
} else if (script.includes("command -v paperclip-runnerd")) {
stdout = "/usr/local/bin/paperclip-runnerd\n";
} else if (script.includes("command -v codex")) {
stdout = "/opt/paperclip-runner/bin/codex\n";
} else if (!script.includes("ln -sfn") && !script.includes("paperclip_codex_launcher_tmp")) {
throw new Error(`unexpected command: ${command.command}`);
}
return { exitCode: 0, signal: null, timedOut: false, stderr: "", stdout };
},
);
await createRunnerdBackend({
db: leaseDb(gatedExecution),
execution: gatedExecution,
runnerInstanceId: "runner-image-runtime",
onLog,
runnerIngressAuthorized: true,
runnerExecutionTarget: {
kind: "remote",
transport: "sandbox",
remoteCwd: "/workspace",
environmentId: "environment",
leaseId: "lease",
providerKey: "daytona",
effectiveCapabilities: { runnerWebSocketIngress: true },
runner: { execute: remoteExecute, syncIn },
} as never,
});
state.createTransport.mockClear();
state.createBackend.mock.calls.at(-1)![1].codexTransportFactory!();
const transport = state.createTransport.mock
.calls[0]![0] as RunnerTransportOptions & {
controlPlaneRegistration: (authority: unknown) => Promise<unknown>;
};
await expect(transport.controlPlaneRegistration({})).rejects.toThrow(
floor
? `runner_remote_provider_artifact_incompatible: ${model} requires Codex ${floor} or newer with ChatGPT sign-in, received ${version} from the sandbox image; promote a sandbox image with Codex 0.160.0 or configure PAPERCLIP_RUNNER_REMOTE_CODEX_NPM_SPEC=@openai/codex@0.160.0`
: "reached-preinstalled-codex-verification",
);
if (floor) {
// No npm spec is configured, so there is no fallback install; the run
// fails before launch instead of running against the stale CLI.
expect(remoteExecute.mock.calls.some(([call]) => call.command === "npm")).toBe(false);
expect(remoteExecute.mock.calls.some(([call]) => call.args?.[1]?.includes("paperclip_codex_launcher_tmp"))).toBe(false);
}
});
it("binds a remote launch to the configured controller-owned runner artifact", async () => {
const remoteCwd = "/home/daytona/paperclip-workspace";
const controllerArtifact = "/controller/artifacts/paperclip-runnerd";