generated: '2026-08-27'
method: searched
source: https://developers.openai.com/changelog/
description: >-
  OpenAI publishes a dated, per-item changelog on the developer site. It is a
  PRODUCT changelog, not an API-version changelog: entries announce models,
  pricing changes, service tiers and dashboard features, and almost never
  announce a change to an endpoint's request or response shape. Nothing in the
  recent window is marked breaking, which is consistent with a surface that has
  no dated API versions to break — breaking change at OpenAI happens on the
  deprecations page instead (lifecycle/openai-lifecycle.yml). Two things stand
  out in this window: pricing moves DOWNWARD repeatedly (three separate
  reductions in four weeks), and a first-party Terraform provider appeared on
  2026-07-29, which is a governance surface the catalog did not previously have
  from OpenAI.
docs: https://developers.openai.com/changelog/
versioning:
  scheme: none-at-the-api-level
  header: null
  current: null
  spec_version: 2.3.0
  note: >-
    Entries reference dated MODEL snapshots (gpt-5.6-sol, gpt-image-2-2026-04-21)
    rather than an API version. Detail in lifecycle/openai-lifecycle.yml.
window: 2026-07-28 to 2026-08-21 (the twelve most recent entries at time of read)
entries:
  - date: '2026-08-21'
    title: Regional processing selection
    breaking: false
    additions: [Per-request regional processing via prefixed domains for API keys in projects with Global geography]
  - date: '2026-08-21'
    title: GPT-5.6 Sol pricing update
    breaking: false
    highlights: ['$4 per million input tokens and $20 per million output tokens, reduced through at least 2026-11-21']
  - date: '2026-08-20'
    title: Prompt caching dashboard
    breaking: false
    additions: [Cache hit rates, cache reads per write, token breakdowns by model and tier]
  - date: '2026-08-20'
    title: Transparent backgrounds in image generation
    breaking: false
    additions: [Preview support for transparent backgrounds on gpt-image-2 in the Images and Responses APIs, PNG and WebP]
  - date: '2026-08-13'
    title: Ultrafast mode
    breaking: false
    additions: [New API service tier for GPT-5.6 Sol, up to 14x faster, limited preview]
  - date: '2026-08-07'
    title: Daybreak security tiers
    breaking: false
    additions: [Daybreak Blue for defensive security work, Daybreak Red for authorized offensive security testing]
  - date: '2026-08-06'
    title: chat-latest snapshot update
    breaking: false
    additions: [chat-latest repointed to the current ChatGPT model for Plus and Pro]
  - date: '2026-08-05'
    title: Fast mode long-context support
    breaking: false
    additions: ['Fast mode handles requests beyond 272K tokens on GPT-5.6, up to 2.5x faster']
  - date: '2026-08-04'
    title: API key filtering in dashboards
    breaking: false
    additions: [Group and filter by API key in the Usage and Costs dashboards and in the Usage and Costs APIs]
  - date: '2026-07-30'
    title: GPT-5.6 pricing reductions and Fast mode launch
    breaking: false
    highlights: ['GPT-5.6 Luna costs 80% less, GPT-5.6 Terra costs 20% less; Fast mode replaces Priority Processing']
  - date: '2026-07-29'
    title: OpenAI Terraform provider
    breaking: false
    additions: [Official Terraform provider for managing API Platform resources as infrastructure as code]
  - date: '2026-07-28'
    title: GPT Transcribe models
    breaking: false
    additions: [GPT Transcribe for file transcription, GPT Live Transcribe for low-latency streaming]
observations:
  breaking_changes_in_window: 0
  pricing_reductions_in_window: 3
  note: >-
    The absence of breaking entries is a property of how OpenAI versions, not
    evidence of stability. Endpoint and product retirement is announced on
    https://developers.openai.com/api/docs/deprecations, where eight entries are
    live and one — the Videos API — shuts down 2026-09-24.