OpenAI

The Assistants API shut down on August 26, 2026, with no further access. Additionally, several transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) are deprecated and will shut down February 26, 2027.

OpenAI added 'Create an environment' and 'List environments' endpoints to the Agents API Environments section, expanding environment management capabilities. The navigation structure now shows Environments as a full CRUD-like resource rather than just 'Retrieve an environment'.

OpenAI has announced the deprecation of whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, and gpt-4o-transcribe-diarize (shutdown February 26, 2027), and has confirmed the Assistants API shut down on August 26, 2026. Migration targets are gpt-live-transcribe or gpt-transcribe, and the Responses/Conversations API respectively.

OpenAI has added support for a new `X-Client-Request-Id` request header that allows developers to supply their own unique identifier for each API request. This ID is logged internally by OpenAI and can be used for troubleshooting when the server-generated `x-request-id` response header is unavailable (e.g., due to timeouts or network issues).

The Assistants API shut down on August 26, 2026, with no further access. Additionally, whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, and gpt-4o-transcribe-diarize are deprecated and will shut down on February 26, 2027.

The Assistants API was shut down on August 26, 2026, with no further access. Multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) were deprecated and will shut down on February 26, 2027.

The Assistants API was shut down on August 26, 2026, with no further access. Multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) were deprecated and will shut down on February 26, 2027.

The Assistants API was shut down on August 26, 2026, with no further access. Multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) were also deprecated and will shut down on February 26, 2027.

A new 'Decisions' section has been added to the Beta APIs portion of the navigation sidebar, appearing between the Conversations section and the Responses (Multi-agent) section. All other content appears unchanged.

OpenAI's changelog covers a large number of updates from May–October 2026, including new models (GPT-6 Astra, GPT-6 Sol, GPT-6 Luna, GPT-6.1 Sol, GPT-Live-1, GPT Transcribe, GPT Image 2.5), new APIs and capabilities (Agents API, Prompt Cache Diagnostics, Ultrafast mode, async tool calling, mid-turn steering, mTLS, Terraform provider, computer use, hard spend limits, IPv6 support), and several deprecations (whisper-1, gpt-4o-transcribe variants, Assistants API shutdown, reusable prompt objects, Evals platform, Agent Builder).

OpenAI's changelog covers a large number of updates from May–October 2026, including new models (GPT-6 Astra, GPT-6 Sol, GPT-6 Luna, GPT-6.1 Sol, GPT-Live-1, GPT Transcribe, GPT Image 2.5), new APIs (Agents API, Prompt Cache Diagnostics, Ultrafast mode), and deprecations of whisper-1, gpt-4o-transcribe variants, and the Assistants API (shut down August 26, 2026). Several breaking changes and deprecations are embedded within this broad changelog dump.

The Assistants API was shut down on August 26, 2026, with no further access. Multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) were deprecated and will shut down on February 26, 2027.

The Assistants API was shut down on August 26, 2026, with no further access. Additionally, multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) were announced for deprecation with a shutdown date of February 26, 2027.

OpenAI added support for a new `X-Client-Request-Id` request header that allows developers to supply their own unique identifier per request, which OpenAI logs internally for supported endpoints. The header must contain only ASCII characters and be no more than 512 characters long, or the request will fail with a 400 error.

OpenAI's changelog covers a large range of updates from May through September 2026, including new models (GPT-6 Astra, GPT-6 Sol, GPT-6 Luna, GPT-6.1 Sol, GPT-Live-1, GPT-Transcribe, GPT-Image-2.5), new APIs and capabilities (Agents API, Prompt Cache Diagnostics, mTLS, Ultrafast mode, Daybreak tiers, workload identity federation), and notable deprecations (whisper-1, gpt-4o-transcribe family, Assistants API shutdown on Aug 26 2026).

The Assistants API was shut down on August 26, 2026, with no further access. Additionally, multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) were deprecated with a shutdown date of February 26, 2027.

OpenAI has added a new 'Administration' section to the API reference navigation, exposing a large set of administrative endpoints covering Admin API Keys, Audit Logs, Certificates, Data Retention, External Storage, Groups, Roles, Users, Invites, Projects, Rate Limits, Service Accounts, Spend Alerts, Spend Limits, and Usage reporting. These endpoints were previously absent from the documented API reference.

OpenAI's changelog documents a large number of new models, features, deprecations, and behavioral changes across September 2026 back through May 2026, including new GPT-6 family models, Agents API GA, GPT-Live-1 GA, Assistants API shutdown, and numerous platform updates.

The Assistants API shut down on August 26, 2026, with no further access. Multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) have been deprecated and will shut down on February 26, 2027.

OpenAI's September 2026 changelog introduces a large number of new models (GPT-6 Astra, GPT-6 Sol, GPT-6 Luna, GPT-6.1 Sol, GPT-Live-1, GPT Image 2.5, GPT Transcribe), new API capabilities (Agents API public beta, Ultrafast mode, Prompt Cache Diagnostics, async tool calling, mid-turn steering, mTLS, IPv6, Terraform provider), and notable breaking/deprecation changes including the shutdown of the Assistants API and deprecation of several transcription models.

A new 'Traces' navigation item (List traces) has been added under the Agents API > Turns section in the API reference sidebar. This represents a new endpoint or resource surface for listing traces within the Agents API.

The Assistants API was shut down on August 26, 2026, with no further access. Multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) were announced as deprecated with a shutdown date of February 26, 2027.

OpenAI released numerous new models, APIs, and features including GPT-6 Astra/Sol/Luna, the Agents API (public beta), GPT-Live-1 (GA), GPT Transcribe, GPT Image 2.5, Prompt Cache Diagnostics, mTLS/X.509 federation, and several governance/infrastructure controls. Simultaneously, significant breaking deprecations were announced: Assistants API shut down August 26, 2026; whisper-1 and gpt-4o-transcribe family deprecated until February 26, 2027; DALL-E snapshots already removed.

Multiple breaking changes detected: DALL-E 2/3 model snapshots and Realtime API Beta were removed on May 12, 2026; the Assistants API shut down on August 26, 2026; and whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, and gpt-4o-transcribe-diarize are deprecated with a shutdown date of February 26, 2027. Additionally, GPT-6 Astra introduces incompatible constraints (no 'none' reasoning effort, no custom temperature/top_p, tool calling requires Responses API).

OpenAI released multiple major models, APIs, and features across a large changelog spanning April–September 2026, including GPT-6 Astra, GPT-6 Sol, GPT-6 Luna, GPT-Live 1, GPT Transcribe, the Agents API, Prompt Cache Diagnostics, new image models, and deprecations of whisper-1, gpt-4o-transcribe variants, DALL·E snapshots, and the Assistants API (which has already shut down as of Aug 26, 2026). Several breaking changes and deprecations are embedded within this bulk changelog.

OpenAI's changelog documents a large number of new models, features, deprecations, and behavioral updates across their API platform spanning from April to September 2026, including new GPT-6 models, Agents API, GPT-Live, transcription models, and several deprecations (Assistants API shutdown, whisper-1, DALL·E snapshots).

OpenAI's changelog covers a large number of updates from April–September 2026, including new models (GPT-6 Astra, GPT-6 Sol/Luna, GPT-5.6 family, GPT-Realtime-2.1, GPT Transcribe, GPT Image 2.5), new APIs/endpoints (Agents API, GPT-Live, Responses API enhancements, Realtime API GA), deprecations (whisper-1, gpt-4o-transcribe variants, Assistants API shutdown, DALL·E snapshots), and numerous platform/governance features. This is a bulk changelog dump spanning multiple months with dozens of distinct changes.

OpenAI's changelog covers a large number of updates from April–September 2026, including new models (GPT-6 Sol, GPT-6 Luna, GPT-6 Astra, GPT-5.6 family, GPT-Realtime-2.1, GPT Transcribe, GPT-Live-1, GPT Image 2.5), new APIs and features (Agents API, Prompt Cache Diagnostics, Daybreak security tiers, mTLS, Terraform provider, Secure MCP Tunnel, workload identity federation, hard spend limits, API key governance), deprecations (whisper-1, gpt-4o-transcribe variants, Assistants API shutdown, DALL·E snapshots), and various behavioral/pricing changes. Notable breaking items include the Assistants API shutdown on Aug 26, 2026, and DALL·E snapshot removals on May 12, 2026.

OpenAI's changelog documents a large number of new models, API features, deprecations, and behavioral changes spanning from April 2026 through September 2026, including new GPT-6 models, Agents API, GPT-Live, transcription models, image generation models, mTLS, Terraform provider, and more. Several significant deprecations are also announced, including whisper-1, gpt-4o-transcribe variants, DALL·E snapshots, and the Assistants API shutdown.

OpenAI released numerous new models, APIs, and features across a multi-month changelog spanning May–September 2026, including GPT-6 Astra/Sol/Luna, GPT-Live-1, GPT-Transcribe, Agents API public beta, mTLS, Terraform provider, and various platform governance controls. Several deprecations were also announced, including whisper-1, DALL-E snapshots, and the Assistants API shutdown.