# OpenAI: phase is no longer accepted

> Source: <https://driftwatch.et/changes/openai-2026-10-22-2abec8de>
> Published: 2026-10-22 17:29:02+00:00

## What changed

Usually ignored rather than rejected, so the call succeeds and does something subtly different.

Affects `phase` on `DecisionInputMessage` reachable from 1 operation. Grep for it: nothing else will tell you.

## Who is affected

Code that sends OpenAI's DecisionInputMessage objects, used by 1 OpenAI operation.

## Before and after

| Where | Before | After | 
|---|---|---|
| DecisionInputMessage.phase | present | absent | 

## Code that breaks

```
await client.post("/…", {
  // phase is now ignored, not rejected
  phase: value,
});
```

Based on OpenAI’s published API specification. [How severity is decided](https://driftwatch.et/method).