OpenAI

Multiple breaking changes including: the Assistants API shut down on August 26, 2026; DALL·E 2/3 model snapshots and Realtime API Beta were removed on May 12, 2026; whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, and gpt-4o-transcribe-diarize are deprecated with shutdown on February 26, 2027. Additionally, GPT-6 Astra does not support `none` reasoning effort, custom temperature/top_p, or logprobs, and requires the Responses API for tool calling.

OpenAI has added new Webhooks endpoints to the API reference navigation, including Create, Retrieve, Update, Delete, List webhooks, Rotate Secret, and Test operations. These appear under a new 'Webhooks Events' section in the sidebar.

OpenAI released multiple major API features including GPT-6 Astra (most capable model), GPT-Live-1 for full-duplex voice, the Agents API in public beta, new transcription models, and numerous platform improvements. Additionally, several significant deprecations were announced including Assistants API shutdown (Aug 26, 2026), whisper-1 and gpt-4o transcription model deprecations (shutdown Feb 26, 2027), and DALL·E model snapshots already removed.

The Assistants API shut down on August 26, 2026, and multiple audio 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. Additionally, DALL·E model snapshots (dall-e-2, dall-e-3) and the Realtime API Beta were removed on May 12, 2026.

The Assistants API was permanently 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 have been deprecated and will shut down on February 26, 2027. DALL·E model snapshots (dall-e-2, dall-e-3) and the Realtime API Beta were also removed on May 12, 2026.

The Assistants API was permanently 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 have been deprecated with a shutdown date of February 26, 2027. Multiple other removals occurred including DALL·E model snapshots and the Realtime API Beta (removed May 12, 2026).

OpenAI has released numerous significant API changes including new models (GPT-6 Astra, GPT-5.6 family, GPT Image 2.5, GPT Transcribe, GPT-Live-1), new endpoints and capabilities (Agents API, GPT-Live sessions, Prompt Cache Diagnostics, mTLS, Terraform provider), and critical deprecations/removals (Assistants API shutdown, whisper-1 and transcription model deprecations, DALL-E snapshots removed). The Assistants API was permanently shut down on August 26, 2026, requiring immediate migration.

The Assistants API was permanently shut down on August 26, 2026, with no further access. Additionally, DALL·E 2/3 model snapshots and the Realtime API Beta were removed on May 12, 2026, and multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) have been deprecated with a shutdown date of February 26, 2027.

The Assistants API shut down on August 26, 2026, and multiple transcription models (whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) have been deprecated with a shutdown date of February 26, 2027. Additionally, DALL·E 2 and DALL·E 3 model snapshots and the Realtime API Beta were removed on May 12, 2026.

OpenAI's API reference navigation added a new 'Live' section under Platform APIs, containing endpoints for session management (Create session, Primary WebSocket, Sideband WebSocket, Fork WebSocket, Sessions Accept/Download Recording/Fork/Hangup/Refer/Reject). Additionally, the navigation label 'Voice & Audio' was renamed to 'Audio & voice'.

OpenAI released multiple major API features and models including GPT-6 Astra, GPT-5.6 family, GPT Image 2.5, new transcription models, Realtime API updates, Terraform provider, mTLS/X.509 GA, and numerous platform capabilities. Additionally, several deprecations and removals occurred including DALL·E model snapshots, Realtime API Beta, Assistants API shutdown, and whisper/transcription model deprecations.

OpenAI's changelog covers a large number of changes across many months (February–September 2026), including new model releases (GPT-6 Astra, GPT-5.6 family, GPT Image 2.5, GPT Transcribe, GPT Realtime 2.1), new API capabilities (async tool calling, mid-turn steering, mTLS, Terraform provider, spend limits, regional processing), deprecations (whisper-1, gpt-4o-transcribe variants shutting down Feb 2027, Assistants API shut down Aug 26 2026, DALL·E snapshots removed May 2026), and breaking removals (Assistants API, DALL·E 2/3 snapshots, Realtime API Beta). Multiple significant breaking changes and deprecations are embedded within this single large diff.

OpenAI released multiple major API changes including GPT-6 Astra (their most capable model), new Responses API controls (async tool calling, mid-turn steering), new transcription models (GPT Transcribe, GPT Live Transcribe), GPT-5.6 model family, and numerous other features and deprecations spanning several months. Notable breaking constraints include GPT-6 Astra not supporting 'none' reasoning effort, custom temperature/top_p, or logprobs, and tool calling requiring the Responses API. Additionally, the Assistants API was shut down on August 26, 2026, and DALL·E snapshots and Realtime API Beta were removed.

Multiple breaking changes in this changelog including: GPT-6 Astra does not support 'none' reasoning effort, custom temperature/top_p, or logprobs; tool calling with GPT-6 Astra requires the Responses API (not Chat Completions); DALL-E 2/3 snapshots and Realtime API Beta were removed on May 12, 2026; the Assistants API shut down on August 26, 2026; and POST /v1/videos/{video_id}/remix is deprecated in favor of POST /v1/videos/edits.

The Audio/Transcription section in the API reference navigation now includes a 'Transcription streaming events' entry, and the 'Create a voice' endpoint was moved out from under 'Voice Consents' to sit at the Audio level. These appear to be documentation/navigation additions reflecting new or newly documented capabilities.

Multiple breaking changes including: GPT-6 Astra does not support 'none' reasoning effort, custom temperature/top_p/logprobs, and requires Responses API for tool calling; DALL·E 2/3 snapshots and Realtime API Beta were removed on May 12, 2026; Assistants API shut down on August 26, 2026; whisper-1 and related transcription models deprecated with shutdown on February 26, 2027. Additionally, new error codes (429 slow_down, 503 server_is_overloaded), prompt_cache_retention default changed to 24h, and POST /v1/videos/{video_id}/remix deprecated in favor of /v1/videos/edits.

The Assistants API was 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 have been deprecated and will shut down on February 26, 2027.

The Assistants API was shut down on August 26, 2026, and 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. Additionally, DALL·E model snapshots (dall-e-2, dall-e-3) and the Realtime API Beta were removed on May 12, 2026.

OpenAI's changelog documents numerous additions and updates spanning August 2026 back to December 2025, including new models (GPT-5.6 family, GPT-Realtime-2.1, GPT Transcribe, GPT Image 2), new API endpoints and features (transparent backgrounds, Fast mode, Ultrafast mode, Daybreak tiers, Prompt Caching dashboard, WebSocket mode, Skills, Compaction, Secure MCP Tunnel, workload identity federation, hard spend limits, regional processing), and several deprecations (DALL·E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder, v1/videos/{video_id}/remix).

OpenAI's changelog documents numerous API additions and updates spanning December 2025 through August 2026, including new models (GPT-5.4 through GPT-5.6 families, GPT-Realtime-2.x, GPT Transcribe, GPT Image 2), new endpoints (v1/videos, v1/realtime/translations, v1/audio/transcriptions), new capabilities (WebSocket mode, compaction, Skills, Secure MCP Tunnel, Terraform provider, workload identity federation), and breaking removals (DALL-E snapshots and Realtime API Beta removed May 12, 2026). Several deprecations were also announced including reusable prompt objects, Evals platform, and Agent Builder.

OpenAI's changelog covers a wide range of updates from December 2025 through August 2026, including new models (GPT-5.4, GPT-5.5, GPT-5.6 family, GPT-Realtime-2, GPT Image 2, GPT Transcribe), new API endpoints and capabilities (Responses API enhancements, Realtime API updates, Batch API expansions, Sora API expansions), pricing changes, dashboard features, and several deprecations (DALL·E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder).

OpenAI's changelog covers a wide range of updates from December 2025 through August 2026, including new models (GPT-5.4, GPT-5.5, GPT-5.6 family, GPT-Realtime-2.x, GPT Transcribe, GPT Image 2), new API endpoints and tools (Responses API enhancements, Realtime API, Sora API expansions, web search image results, Skills, Compaction, WebSocket mode), pricing changes, deprecations (DALL-E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder), and platform features (Terraform provider, Secure MCP Tunnel, workload identity federation, spend limits, Prompt Caching dashboard). This is a bulk changelog snapshot rather than a single discrete change.

OpenAI's changelog covers a wide range of updates from December 2025 through August 2026, including new models (GPT-5.4, GPT-5.5, GPT-5.6 family, GPT Image 2, GPT Transcribe, GPT Realtime 2.x), new API endpoints and tools (WebSocket mode, Secure MCP Tunnel, Terraform provider, Daybreak tiers, transparent backgrounds for images), pricing changes, and several deprecations (DALL·E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder). Notable breaking changes include the removal of DALL·E 2/3 snapshots and the Realtime API Beta on May 12, 2026, and the deprecation of POST /v1/videos/{video_id}/remix in favor of POST /v1/videos/edits.

OpenAI's changelog covers a wide range of updates from December 2025 through August 2026, including new models (GPT-5.4, GPT-5.5, GPT-5.6 family, GPT-Image-2, GPT-Realtime-2.x, GPT-Transcribe), new API endpoints and capabilities (WebSocket mode, Secure MCP Tunnel, Terraform provider, hard spend limits, workload identity federation, transparent backgrounds for image generation), pricing changes, and several deprecations (DALL-E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder).

OpenAI's changelog covers a broad range of updates from December 2025 through August 2026, including new model releases (GPT-5.4, GPT-5.5, GPT-5.6 family, GPT Image 2, GPT Transcribe, GPT Realtime 2.x), new API endpoints and capabilities (WebSocket mode, Secure MCP Tunnel, Terraform provider, workload identity federation, hard spend limits, Prompt Caching dashboard), and several deprecations (DALL·E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder). Notable breaking changes include the removal of DALL·E 2/3 snapshots and the Realtime API Beta on May 12, 2026, and the deprecation of POST /v1/videos/{video_id}/remix in favor of POST /v1/videos/edits.

OpenAI's changelog covers a large number of updates spanning August 2025 through August 2026, including new models (GPT-5.6 family, GPT-Realtime-2.1, GPT Transcribe, gpt-image-2), new API endpoints and tools (Daybreak tiers, Fast mode, Terraform provider, Secure MCP Tunnel, WebSocket mode, Skills, Compaction), pricing changes, and several deprecations (DALL·E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder). Notable breaking changes include the removal of dall-e-2, dall-e-3, and the Realtime API Beta on May 12, 2026, and the POST /v1/videos/{video_id}/remix endpoint being deprecated in favor of POST /v1/videos/edits.

OpenAI's changelog covers a large number of updates spanning August 2026 back to December 2025, including new models (GPT-5.6 family, GPT Image 2, GPT-Realtime-2.1, GPT Transcribe), new API endpoints, pricing changes, deprecations (DALL·E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder), and platform features (Terraform provider, Secure MCP Tunnel, hard spend limits, workload identity federation, transparent backgrounds for image generation). Multiple breaking changes and deprecations are embedded within this bulk changelog dump.

OpenAI's changelog documents a large number of cumulative API additions and updates spanning December 2025 through August 2026, including new models (GPT-5.6 family, GPT-Realtime-2.1, GPT Transcribe, gpt-image-2), new endpoints (v1/videos, v1/realtime/translations, v1/audio/transcriptions), new capabilities (transparent backgrounds, Fast mode, Ultrafast mode, Secure MCP Tunnel, workload identity federation, spend limits, regional processing), and several deprecations (DALL·E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder, v1/videos/{video_id}/remix).

OpenAI's changelog covers a broad range of updates from December 2025 through August 2026, including new models (GPT-5.5, GPT-5.6 family, GPT-Realtime-2.1, GPT Transcribe, GPT Image 2), new API endpoints (v1/videos, v1/realtime/translations, v1/audio/transcriptions), new platform features (Prompt Caching dashboard, Terraform provider, Secure MCP Tunnel, hard spend limits, workload identity federation), and several deprecations (DALL·E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder). Notable breaking changes include the removal of dall-e-2, dall-e-3 snapshots and the Realtime API Beta on May 12, 2026.

OpenAI's changelog covers a large number of updates from December 2025 through August 2026, including new models (GPT-5.4, GPT-5.5, GPT-5.6 family, GPT-Realtime-2.x, GPT Transcribe, GPT Image 2), new API endpoints and tools (Responses API enhancements, WebSocket mode, Secure MCP Tunnel, Terraform provider, hard spend limits, Programmatic Tool Calling, transparent backgrounds for gpt-image-2), and several deprecations/removals (DALL·E snapshots, Realtime API Beta, reusable prompt objects, Evals platform, Agent Builder, v1/videos/{video_id}/remix). Multiple breaking removals are embedded within this large changelog dump.