25 releases from to
Everything OpenAI shipped in September 2026, collected from official OpenAI sources. Each entry is dated and links to the page it came from.
September 2026 was OpenAI's busiest month of the 12 months to then: 25 releases, about 2× its monthly average of 12. That was 4 releases more than August 2026. Most were Developer Tools (11), followed by Model (9) and Enterprise & Security (2).
Releases
25
+4 vs August 2026
Rank of 12 months
1st
Average 12.4 a month
Most shipped
Developer Tools
11 releases
Released GPT-6.1 Sol (gpt-6.1-sol) for complex coding and professional work at a lower cost than GPT-6 Astra. Standard pricing per 1M tokens for prompts with up to 272K input tokens is $2 input, $0.10 cached input, $2.50 cache write, and $10 output. GPT-6.1 Sol also supports Mul…
Source: OpenAI API ChangelogGPT-6.1 Sol offers near-Astra performance for complex work at a lower cost than Astra. Use gpt-6.1-sol; it is also the default model in the bundled catalog and Amazon Bedrock catalogs as of Codex CLI 0.159.1. Availability depends on plan, client and workspace settings.
Source: Codex ChangelogFixed a bug in image encoding that degraded image understanding in GPT-6 Sol and GPT-6 Luna. This update improves results on visual tasks in the API and Codex, including computer use. If your use cases involve image inputs, we recommend rerunning your evaluations and retrying wo…
Source: OpenAI API ChangelogNewest first. Each entry links to the official page it came from.
Added Ultrafast mode for GPT-6 Astra in the Responses API. Use gpt-6-astra with service_tier: "ultrafast" to reduce the time between generated output tokens. It is available to API customers, subject to rate limits, with global processing and US data residency. EU and other regi…
Released GPT-6.1 Sol (gpt-6.1-sol) for complex coding and professional work at a lower cost than GPT-6 Astra. Standard pricing per 1M tokens for prompts with up to 272K input tokens is $2 input, $0.10 cached input, $2.50 cache write, and $10 output. GPT-6.1 Sol also supports Mul…
GPT-6.1 Sol offers near-Astra performance for complex work at a lower cost than Astra. Use gpt-6.1-sol; it is also the default model in the bundled catalog and Amazon Bedrock catalogs as of Codex CLI 0.159.1. Availability depends on plan, client and workspace settings.
Agents can complete tasks in an OpenAI-hosted browser, with website access approvals and sign-in handled by your application.
New features include opt-in instant_interrupt, compact welcome screen, and native Mermaid rendering improvements.
Released the Agents API in public beta. Build agents with a managed Codex harness while OpenAI handles session orchestration, context compaction, and recovery.
New features include configurable copy-on-select and right-click paste in the fullscreen TUI, support for OAuth client secrets, bearer token authentication, transparent background image generation, and default terminal input approval for elevated commands.
Fixed a bug in image encoding that degraded image understanding in GPT-6 Sol and GPT-6 Luna. This update improves results on visual tasks in the API and Codex, including computer use. If your use cases involve image inputs, we recommend rerunning your evaluations and retrying wo…
Added GPT-6 Sol and Luna, including Amazon Bedrock support and migration prompts for older models. Enabled fullscreen transcripts by default and added Shift-click to extend text selections. Enabled automatic background-server startup for eligible interactive sessions, with recov…
Released GPT-6 Sol (gpt-6-sol) and GPT-6 Luna (gpt-6-luna). These reasoning models accept text and image inputs and generate text through the Responses and Chat Completions APIs. Standard pricing per 1M tokens for prompts with up to 272K input tokens: GPT-6 Sol: $2 input, $0.20…
GPT-6 Sol and GPT-6 Luna are rolling out to Codex and ChatGPT Work at lower token prices than their GPT-5.6 predecessors. Use Sol for complex coding and agentic workflows, and Luna for focused, high-volume tasks. Select with /model or codex --model gpt-6-sol / gpt-6-luna.
Choose an optional fullscreen UI with /tui for your next launch, including transcript search, mouse selection, and right-click copying. Voice conversations are enabled by default...
Administrators can allow only service-account keys, allow only user-owned project keys, or disable all new API key creation. Organization restrictions take precedence over project settings, and existing API keys are unaffected.
Type a quick chat from floating Pets controls in the ChatGPT desktop app on macOS and Windows, and share an app window with an appshot on Windows (Alt+Alt).
Released the Agents API in public beta. Build agents with a managed Codex harness while OpenAI handles session orchestration, context compaction, and recovery. Use durable sessions to continue work across turns, stream progress, and connect your own tools and MCP servers. Run ag…
GPT-Live 1 is now generally available in the API. Build full-duplex voice conversations that can continue while a backend model or agent handles reasoning and tools. Use Responses delegation with an OpenAI model, or client delegation to connect your own backend. Voice sessions c…
Project API keys can now be created with expiration dates. Administrators can also enforce a maximum key lifetime at the organization or project level in Platform settings, requiring newly created keys to expire within the configured limit.
Released GPT Image 2.5 Sunburst and GPT Image 2.5 Flare for image generation and editing through the Image API and the Responses API image generation tool. Use Sunburst for workflows where editing precision matters most, or Flare for fast, high-quality everyday image generation.…
Prompt Cache Diagnostics is now generally available in the Responses API for GPT-5.6 and later supported models. Compare cache reuse against a previous response, identify reasons for cache misses, and follow troubleshooting guidance to improve cache reuse.
GPT-Rosalind (gpt-rosalind-research) is now generally available through the trusted-access program for approved internal life sciences research. Standard pricing is $5 per 1M input tokens, $0.50 per 1M cached input tokens, and $25 per 1M output tokens. Billing begins on October…
Released GPT-6 Astra , our most capable model, built for the hardest end-to-end work. Use GPT-6 Astra for reasoning, coding, computer use, research, and document creation. It combines these capabilities to carry complex tasks from an initial request to a finished result, using t…
Added new controls for long-running work with GPT-6 Astra in the Responses API: Async tool calling : Let the model continue working while your application runs function or custom tools, then return results as they become available. Mid-turn steering : Send additional instruction…
Differentiate traffic rate issues from temporary model overload with new error codes
Updated API errors to distinguish traffic that increases too quickly from temporary model overload. Traffic that increases too quickly returns a 429 error with the slow_down code. Temporary model overload returns a 503 error with the server_is_overloaded code.
Connections to api.openai.com now support IPv6.
OpenAI releases per month, for September 2026 and the 11 months before it. A taller bar means more releases that month; the dated entries for each month are on its own page.
26 of the companies we track shipped in September 2026; OpenAI ranks 3rd by number of releases.
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