OpenAI API: rate-limit headers, four usage tiers, and the three-date deprecation table (docs, 2026-11-03)

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Source: OpenAI API docs — Rate limits (`developers.openai.com/api/docs/guides/rate-limits`, redirected from `platform.openai.com/docs/guides/rate-limits`) and Deprecations (`developers.openai.com/api/docs/deprecations`, redirected from `platform.openai.com/docs/deprecations`). Fetched live 2026-11-03.

## Rate-limit response headers (documented)
- `x-ratelimit-limit-requests`, `x-ratelimit-remaining-requests`, `x-ratelimit-reset-requests`
- `x-ratelimit-limit-tokens`, `x-ratelimit-remaining-tokens`, `x-ratelimit-reset-tokens`
- `x-ratelimit-limit-project-tokens`, `x-ratelimit-remaining-project-tokens`, `x-ratelimit-reset-project-tokens` (project-level, a separate bucket from the account-level pair above)
- `Retry-After` on a 429: "tells you how many seconds to wait before trying again" — documented as present, not guaranteed on every 429.

## Usage tiers (automatic, qualification by cumulative paid credit)
| Tier | Qualification | Monthly spend limit |
|---|---|---|
| Free | allowed geography only | $100 |
| Build | $5+ in credit purchases | $500 |
| Launch | $100+ in credit purchases | $5,000 |
| Grow | $500+ in credit purchases | $200,000 |

Example RPM/TPM spread across tiers (varies by model): Build ~5,000 RPM / 1-2M TPM; Launch ~10,000 RPM / 4-10M TPM; Grow ~15,000-30,000 RPM / 40-180M TPM. Tiers gate throughput, not just spend.

## 429 shape
A 429 is returned for rate limits; a distinct `slow_down` error code is documented for "rapid traffic increases" specifically — a separate signal from a flat quota 429.

## Deprecation notices
Published at the URL above as a three-date table: announcement/notification date, deprecation date (the model "immediately becomes deprecated" the moment of announcement), and shutdown date. No fixed minimum notice window is stated as a policy number on this page; observed notice periods in the live table range from ~2 months (`gpt-5-pro`/`gpt-5-pro-2025-10-06` announced 2026-06-11, shutdown 2026-12-11) to ~5 months (`gpt-4o-2024-08-06`, `gpt-4o-2024-11-20` announced 2026-10-14, shutdown 2027-01-14, replacement `gpt-6-luna`). The table lists exact replacement model names per row (e.g. `whisper-1` -> `gpt-live-transcribe`/`gpt-transcribe`, shutdown 2027-02-26; `gpt-5.3-codex` -> `gpt-6-sol`, shutdown 2027-04-01).

How observed: 2026-11-03T11:47Z, documentation fetch (not a live API probe — these facts require an authenticated account to observe as real response headers; recorded from the provider's current published docs, which carry the fetch date above since neither page itself prints a last-updated date).

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