AI model releases, September 2026
20 model releases in our dataset for September 2026, from OpenAI, Anthropic, Google, xAI, DeepSeek, Cohere. The newest is GPT-6.1 Sol (Sep 29, 2026).
Period Sep 1, 2026 to Sep 30, 2026 · last verified · Reported from vendor pages, not run by us · this lists releases we track, not every model a vendor shipped · Markdown
| Date | Model | Vendor | Status | Release date source |
|---|---|---|---|---|
| GPT-6.1 Sol | OpenAI | generally available | source | |
| Claude Sonnet 5.5 | Anthropic | generally available | source · Anthropic's newsroom date. At least one third-party site gives Oct 1; we use the vendor's date. | |
| Claude Opus 5.5 | Anthropic | generally available | source | |
| Gemini 3.8 Flash TTS | generally available | source | ||
| Gemini 3.8 Flash-Lite TTS | generally available | source | ||
| GPT-6 Luna | OpenAI | generally available | source · OpenAI API changelog: GPT-6 Sol and GPT-6 Luna released together. | |
| GPT-6 Sol | OpenAI | generally available | source · OpenAI API changelog: GPT-6 Sol and GPT-6 Luna released together. | |
| Grok 4.7 | xAI | generally available | source | |
| Grok Voice Transcribe 2.0 | xAI | generally available | source | |
| Claude Fable 5.1 | Anthropic | generally available | source · Date of the Anthropic announcement "Introducing Claude Mythos and Fable 5.1". | |
| Gemini 3.8 Live | generally available | source | ||
| Gemini 3.8 Live Extended Thinking | generally available | source | ||
| DeepSeek-V4.1-Flash | DeepSeek | generally available | source · V4.1-Flash release; the DeepSeek-V4.1-Flash-1017 update followed on 2026-10-17. | |
| GPT-Live 1 | OpenAI | generally available | source · API general availability per the OpenAI API changelog. It reached ChatGPT earlier, on Jul 8, 2026, per OpenAI. | |
| North Small Translate | Cohere | generally available | source | |
| GPT-Image-2.5 Flare | OpenAI | generally available | source | |
| GPT-Image-2.5 Sunburst | OpenAI | generally available | source · OpenAI API changelog: Sunburst and Flare released together. | |
| GPT-6 Astra | OpenAI | generally available | source · Announced Sep 3, 2026 as a limited rollout to a set of organizations; OpenAI's announcement says "rolling out today to a limited set of organizations". | |
| Gemini 3.8 Flash | generally available | source | ||
| Claude Mythos 5.1 | Anthropic | limited access | source · Date of the launch entry in the Claude Platform release notes (API availability). |
What each release is
GPT-6.1 Sol
OpenAI ·
InTextImageOutText
Context window 1.05M
Claude Sonnet 5.5
Anthropic ·
InTextImageOutText
Context window 1M
Claude Opus 5.5
Anthropic ·
InTextImageOutText
Context window 1M
Gemini 3.8 Flash TTS
Google ·
Innot verifiedOutAudio
Context window: not verified
Gemini 3.8 Flash-Lite TTS
Google ·
InTextOutAudio
Context window 8K
GPT-6 Luna
OpenAI ·
InTextImageOutText
Context window 1.05M
GPT-6 Sol
OpenAI ·
InTextImageOutText
Context window: not verified
Grok 4.7
xAI ·
InTextImageOutText
Context window 500K
InAudioOutText
Context window: not verified
Claude Fable 5.1
Anthropic ·
InTextImageOutText
Context window 1M
Gemini 3.8 Live
Google ·
InTextAudioOutTextAudio
Context window: not verified
InTextImageAudioOutTextAudio
Context window 131K
DeepSeek-V4.1-Flash
DeepSeek ·
InTextImageOutText
Context window 1M
GPT-Live 1
OpenAI ·
InTextAudioOutTextAudio
Context window: not verified
North Small Translate
Cohere ·
Modalities not verified
Context window 16K
GPT-Image-2.5 Flare
OpenAI ·
InTextImageOutImage
Context window: not verified
GPT-Image-2.5 Sunburst
OpenAI ·
Innot verifiedOutImage
Context window: not verified
GPT-6 Astra
OpenAI ·
InTextImageOutText
Context window 1.05M
Gemini 3.8 Flash
Google ·
InTextImageVideoAudioPDFOutnot verified
Context window 1.05M
Claude Mythos 5.1
Anthropic ·
Modalities not verified
Context window 1M