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OpenAI developer documentation update

openai-api-changelog engineering-technology May 23, 2026 source →
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Changelog | OpenAI API

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Secure MCP Tunnel is available for enterprise customers.

paraphrasestatedengineering-technologyMay 23, 2026

Secure MCP Tunnel allows OpenAI products (ChatGPT web, Codex, Responses API, AgentKit) to connect to private or on-prem MCP servers.

paraphrasestatedengineering-technologyMay 23, 2026

Secure MCP Tunnel uses a customer-hosted `tunnel-client`.

paraphrasestatedengineering-technologyMay 23, 2026

Secure MCP Tunnel prevents exposing private or on-prem MCP servers to the public internet.

paraphrasestatedengineering-technologyMay 23, 2026

Secure MCP Tunnel is GA, but account-led.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI deprecated `dall-e-2` model snapshot.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI removed `dall-e-2` model snapshot from the API on May 12, 2026.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI recommends using `gpt-image-2` instead of `dall-e-2`.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI recommends using `gpt-image-1` instead of `dall-e-2`.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI recommends using `gpt-image-1-mini` instead of `dall-e-2`.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI deprecated `dall-e-3` model snapshot.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI removed `dall-e-3` model snapshot from the API on May 12, 2026.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI recommends using `gpt-image-2` instead of `dall-e-3`.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI recommends using `gpt-image-1` instead of `dall-e-3`.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI recommends using `gpt-image-1-mini` instead of `dall-e-3`.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI deprecated Realtime API Beta.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI removed Realtime API Beta from the API on May 12, 2026.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI recommends migrating from Realtime API Beta to the released Realtime API.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI added `return_token_budget` to the Responses API.

paraphrasestatedengineering-technologyMay 23, 2026

`return_token_budget` is for the web search tool.

paraphrasestatedengineering-technologyMay 23, 2026

`return_token_budget` enables longer GPT-5+ reasoning web search runs.

paraphrasestatedengineering-technologyMay 23, 2026

`return_token_budget` is for high-effort research and evaluation workloads.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI released `gpt-realtime-2` model.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-realtime-2` is a new realtime voice model.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-realtime-2` supports configurable reasoning for speech-to-speech agents.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI released `gpt-realtime-translate` model.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-realtime-translate` supports streaming speech translation.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI released `gpt-realtime-whisper` model.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-realtime-whisper` supports streaming speech-to-text.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI updated the Realtime and audio guide.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI added a dedicated Realtime translation guide.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI refreshed Realtime transcription for streaming transcripts.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI moved realtime prompting guidance into Using realtime models.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI released the OpenAI Developers plugin for Codex.

paraphrasestatedengineering-technologyMay 23, 2026

The OpenAI Developers plugin for Codex helps build AI applications in Codex.

paraphrasestatedengineering-technologyMay 23, 2026

The OpenAI Developers plugin for Codex helps build agents in Codex.

paraphrasestatedengineering-technologyMay 23, 2026

The OpenAI Developers plugin for Codex provides OpenAI Platform access.

paraphrasestatedengineering-technologyMay 23, 2026

The OpenAI Developers plugin for Codex provides OpenAI API setup guidance.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI Agents SDK is now available in TypeScript.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI Agents SDK supports sandbox agents.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI Agents SDK includes an open-source harness.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI released `chat-latest` model snapshot.

paraphrasestatedengineering-technologyMay 23, 2026

`chat-latest` points to the latest Instant model used in ChatGPT.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI recommends `GPT-5.5` for production API usage.

paraphrasestatedengineering-technologyMay 23, 2026

`chat-latest` is for testing latest improvements for chat use cases.

paraphrasestatedengineering-technologyMay 23, 2026

The underlying model snapshot for `chat-latest` will be regularly updated.

paraphrasestatedengineering-technologyMay 23, 2026

Admin APIs are supported in OpenAI Node SDK.

paraphrasestatedengineering-technologyMay 23, 2026

Admin APIs are supported in OpenAI Python SDK.

paraphrasestatedengineering-technologyMay 23, 2026

Admin APIs are supported in OpenAI Go SDK.

paraphrasestatedengineering-technologyMay 23, 2026

Admin APIs are supported in OpenAI Ruby SDK.

paraphrasestatedengineering-technologyMay 23, 2026

Admin APIs are supported in OpenAI Java SDK.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI released `gpt-5.5` model.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-5.5` is a new frontier model for complex professional work.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-5.5` is available via Chat Completions API.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-5.5` is available via Responses API.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI released `gpt-5.5-pro` model.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-5.5-pro` is for Responses API requests.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-5.5-pro` is for tougher problems benefiting from more compute.

paraphrasestatedengineering-technologyMay 23, 2026

`gpt-5.5` supports a 1M token context window.

paraphrasestatedengineering-technologyMay 23, 2026

OpenAI released Secure MCP Tunnel.

paraphrasestatedengineering-technologyMay 23, 2026