OpenAI new features in September 2026

Everything OpenAI shipped in September 2026: 24 releases, grouped by product, each linked to OpenAI's release notes.

August 2026

GA 3Beta 1Pricing 1Update 19

OpenAI API14

OpenAI APISep 22, 2026

OpenAI releases GPT-6 Sol and GPT-6 Luna reasoning models

Both models take text and image input and return text via the Responses and Chat Completions APIs. Up to 272K input tokens, GPT-6 Sol costs $2 input and $10 output per 1M tokens, and GPT-6 Luna $0.10 and $0.50.

UpdateLLMsGovernancePricingSource

OpenAI APISep 15, 2026

OpenAI API adds API key creation governance controls

Admins can allow only service-account keys, only user-owned project keys, or block new key creation at the organization or project level. Organization settings take precedence and existing keys are unaffected.

UpdateGovernanceDeveloper toolsSource

OpenAI APISep 10, 2026

Build more natural voice experiences with GPT‑Live‑1 in the API

GPT‑Live‑1 brings natural, full-duplex voice conversations to the API, with stronger instruction following, custom voices, and telephony support.

UpdateDeveloper toolsSource

OpenAI APISep 10, 2026

Introducing the Agents API

Build and launch cloud agents with the Agents API, a managed service powered by the Codex harness for orchestration, long-running sessions, and tool use.

UpdateAI agentsDeveloper toolsCoding agentsSource

OpenAI APISep 10, 2026

OpenAI Agents API enters public beta

The Agents API runs agents on a managed Codex harness with OpenAI handling session orchestration, context compaction and recovery. It offers durable sessions, streaming, your own tools and MCP servers, and hosted or self-provided sandboxes.

BetaAI agentsMCPStreamingSource

OpenAI APISep 10, 2026

OpenAI GPT-Live 1 is generally available for full-duplex voice

GPT-Live 1 supports full-duplex voice conversations that continue while a backend model or agent handles reasoning and tools. Voice sessions cost $0.05 per minute billed per second, with backend usage charged separately.

GAAI agentsPricingDeveloper toolsSource

OpenAI APISep 10, 2026

OpenAI project API keys support expiration dates

Project API keys can now be created with an expiration date, and admins can enforce a maximum key lifetime at the organization or project level.

UpdateDeveloper toolsSource

OpenAI APISep 8, 2026

OpenAI GPT-Rosalind is GA for approved life sciences research

gpt-rosalind-research is available through the trusted-access program at $5 input, $0.50 cached input and $25 output per 1M tokens. Billing begins October 5, 2026.

GAPricingSource

OpenAI APISep 8, 2026

OpenAI Prompt Cache Diagnostics is generally available in the Responses API

For GPT-5.6 and later, developers can compare cache reuse against a previous response, see reasons for cache misses and follow guidance to improve cache hit rates.

GALLMsDeveloper toolsSource

OpenAI APISep 8, 2026

OpenAI releases GPT Image 2.5 Sunburst and GPT Image 2.5 Flare

Sunburst targets precise image editing and Flare fast everyday generation, both via the Image API and Responses image tool. They support new xhigh and max quality settings at GPT Image 2 token rates.

UpdateLLMsPricingDeveloper toolsSource

OpenAI APISep 3, 2026

OpenAI Responses API adds async tool calling and mid-turn steering for GPT-6 Astra

New long-running work controls let GPT-6 Astra keep working while tools run, accept extra instructions mid-response over WebSockets, and change reasoning effort mid-conversation while preserving the cached prompt.

UpdateLLMsDeveloper toolsSource

OpenAI APISep 3, 2026

OpenAI releases GPT-6 Astra for complex end-to-end work

GPT-6 Astra targets reasoning, coding, computer use, research and document creation. When migrating, note it lacks the none reasoning effort, custom temperature, top_p and logprobs.

UpdateAI agentsLLMsPricingSource

OpenAI APISep 2, 2026

OpenAI API separates slow_down 429s from server_is_overloaded 503s

Traffic ramping too quickly now returns 429 slow_down, while temporary model overload returns 503 server_is_overloaded. Honor Retry-After when present, otherwise use exponential backoff.

UpdateDeveloper toolsSource

OpenAI APISep 1, 2026

OpenAI API supports IPv6 connections to api.openai.com

Connections to api.openai.com can now use IPv6.

UpdateDeveloper toolsSource

ChatGPT10

ChatGPTSep 22, 2026

Introducing GPT-6 Sol and Luna

Meet GPT-6 Sol and Luna, two models that bring frontier intelligence to everyday work with different balances of capability and cost.

UpdateLLMsPricingSource

ChatGPTSep 17, 2026

Introducing Astra for Law

OpenAI for Law brings frontier intelligence for law, custom firm workflows, connected legal data sources, and legal-grade controls for confidential client work.

UpdateSource

ChatGPTSep 16, 2026

Reimagining advertising with AI

Explore new AI-powered advertising experiences from OpenAI, including Sponsored Agents, tools for marketers, and integrations with HubSpot and Shopify.

UpdateAI agentsSource

ChatGPTSep 10, 2026

Expanding AI access and cyber defense for federal, state, local, and tribal governments

OpenAI and GSA will offer eligible federal, state, local, and tribal governments $0 license fees, 50% off usage, and expanded cyber defense support.

PricingSource

ChatGPTSep 10, 2026

Introducing ChatGPT for Financial Services

Introducing ChatGPT for Financial Services, combining built-in financial data and GPT-6 Astra for research, modeling, and client-ready materials.

UpdateLLMsSource

ChatGPTSep 10, 2026

Now everyone can put data to work

Meet the Data agent in ChatGPT Work. Connect company data, uncover insights, and build interactive dashboards with AI using natural language.

UpdateAI agentsBISource

ChatGPTSep 9, 2026

GPT-6 Astra: The next generation in intelligence for work

Meet GPT-6 Astra, OpenAI’s most capable model for business, with advanced reasoning, computer use, and stronger writing and design judgment.

UpdateLLMsSource

ChatGPTSep 8, 2026

Introducing ChatGPT Images 2.5

ChatGPT Images 2.5 helps turn your ideas, sketches, and reference photos into more personalized, polished images that better reflect your ideas.

UpdateSource

ChatGPTSep 3, 2026

GPT-6 Astra: A new generation of intelligence

Introducing GPT-6 Astra, our most intelligent and aligned model yet, with state-of-the-art capabilities across computer use, coding, cybersecurity, and science.

UpdateLLMsSecuritySource

ChatGPTSep 1, 2026

Healthcare organizations can now connect EHR and additional industry data to ChatGPT

ChatGPT can now connect to trusted healthcare data, helping clinicians securely access patient context, medical research, and more.

UpdateSource