Bottom line

Assuming you mean the latest OpenAI models available in 2026, not only models first announced in 2026: the clearest official 2026 ChatGPT model names I could verify are GPT-5.3, GPT-5.4, and GPT-5.4 mini, with GPT-5.2 variants also listed in current plan docs.^[7][9][29] Older ChatGPT models including GPT-5, GPT-5.1, GPT-4o, GPT-4.1, GPT-4.1 mini, and o4-mini have been retired from ChatGPT, while OpenAI says API access for those retired ChatGPT models remains unchanged.^[21][25][26] The current API docs also list specialized models such as GPT Image 1.5, gpt-image-1-mini, gpt-realtime-1.5, gpt-realtime-mini, and GPT-4o mini TTS.^[1]

Key findings

• OpenAI’s Help Center has a current page specifically for “GPT-5.3 and GPT-5.4 in ChatGPT,” and it describes GPT-5.4 Thinking as its most capable reasoning model in ChatGPT.^[29]
• OpenAI says GPT-5.4 mini rolled out in ChatGPT on March 18, 2026.^[7]
• Current ChatGPT Enterprise/Edu model docs list GPT-5.3 / GPT-5.2 Instant, GPT-5.4 / GPT-5.2 Thinking, and GPT-5.4 / GPT-5.2 Pro.^[9]
• OpenAI says GPT-5.1 Instant, GPT-5.1 Thinking, and GPT-5.1 Pro were retired from ChatGPT on March 11, 2026.^[25]
• OpenAI also says GPT-5, GPT-4o, GPT-4.1, GPT-4.1 mini, and o4-mini were retired from ChatGPT on February 13, 2026.^[21][25][26]

Confirmed facts

• GPT-5.4 Thinking is presented by OpenAI as its strongest reasoning model in ChatGPT.^[29]
• GPT-5.4 mini is available in ChatGPT, including for lighter-access tiers via the “Thinking” feature, according to OpenAI’s March 18, 2026 release note.^[7]
• OpenAI’s official ChatGPT plan docs currently show GPT-5.3, GPT-5.4, and GPT-5.2 variants in use.^[9]
• OpenAI’s API docs currently show specialized model families for image generation, realtime speech, and text-to-speech.^[1]
• GPT-4.1 was officially introduced as an API family including GPT-4.1, GPT-4.1 mini, and GPT-4.1 nano.^[17]
• OpenAI officially introduced o3 and o4-mini as reasoning models with tool use.^[18]

What remains inference

• The “new OpenAI models in 2026” most likely means the GPT-5.3 / GPT-5.4 generation, especially GPT-5.4 and GPT-5.4 mini, because those are the clearly current names on official 2026 ChatGPT pages.^[7][9][29]
• If you mean only models first launched during calendar year 2026, Insufficient evidence to give a complete launch-only list from the snippets alone, because several official pages show current availability or retirement rather than original announcement dates.^{[9][21][25][29]}

What the evidence suggests

• For ChatGPT users in 2026, the main current high-end models appear to be GPT-5.4 Thinking and GPT-5.4 Pro, with GPT-5.3 Instant as the faster general-use option and GPT-5.4 mini as a lighter model.^[7][9][29]
• For API users, OpenAI appears to be maintaining a broader catalog than ChatGPT, including specialized image, realtime, and voice models, and keeping some ChatGPT-retired models available in the API.^[1][25][26]

Conflicting evidence or uncertainty

• I did not find one single official “2026 model roundup” page; the answer has to be pieced together from official model notes, plan-limit pages, and retirement notices.^{[7][9][21][25][29]}
• I also found official pages for “open models” and “gpt-oss,” but the search snippets did not give enough date context for me to confidently include them as confirmed “new 2026” models in this answer.^[30][33]

Open questions

• Do you want the ChatGPT model lineup, the API model lineup, or only models first launched in 2026?
• Do you want a simple “best model for coding, writing, research, image, and voice” recommendation list?

Sources worth trusting most

• OpenAI API docs, because they are first-party documentation for currently supported API models.^[1]
• OpenAI Help Center model and plan pages, because they describe current ChatGPT availability, retirements, and limits, and some are updated within days.^{[7][9][25][29]}
• OpenAI’s own product announcement pages for GPT-4.1 and o3/o4-mini, because they confirm those model families and their intended use cases.^[17][18]

Recommended next step

I can turn this into a very short cheat sheet like: “best OpenAI model in 2026 for chat, coding, research, speed, cheapest API, image, and voice.” If you want, I’ll make it simple.

Summary

The strongest official evidence points to GPT-5.3, GPT-5.4, and GPT-5.4 mini as OpenAI’s clearly current ChatGPT-era models in 2026, with GPT-5.2 variants also still documented in plan pages.^[7][9][29] Older ChatGPT models such as GPT-5.1, GPT-5, GPT-4o, GPT-4.1, and o4-mini have been retired from ChatGPT, while the API still shows a broader set of available and specialized models.^{[1][21][25][26]}