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Models

13 ChatGPT pages in Models.

ChatGPT ModelsAs of Nov 6, 2026, ChatGPT's Chat tab runs GPT-6 (GPT-6 Sol on paid plans, a Luna model on Free and Go) with Instant, Medium, High and Extra High levels plus Pro, powered by GPT-6 Astra; ChatGPT Work and Codex offer GPT-6 Astra, GPT-6.1 Sol, GPT-6.1 Terra, GPT-6 Sol and GPT-6 Luna.
GPT-4oGPT-4o was OpenAI's "omni" model, launched May 13, 2024, that brought native voice and image generation to ChatGPT. It was retired from ChatGPT on Feb 13, 2026 (Apr 3, 2026 in business custom GPTs) and shuts down in the API on Jan 14, 2027.
GPT-5GPT-5 is OpenAI's model generation from Aug 7, 2025 to the GPT-5.6 Sol, Terra and Luna models of July 2026, with point releases 5.1 through 5.6 in between. In ChatGPT only GPT-5.6 Sol, GPT-5.6 Sol Pro and a few smaller GPT-5 models remain as of Nov 6, 2026.
GPT-6GPT-6 is OpenAI's model family of fall 2026: GPT-6 Astra (Sep 3, 2026), GPT-6 Sol and GPT-6 Luna (Sep 22), GPT-6.1 Sol (Sep 29) and GPT-6.1 Terra (Oct 26), with GPT-6 Pro on Astra. It became ChatGPT's default for everyone from Oct 7, 2026.
GPT-6 AstraGPT-6 Astra is OpenAI's most capable model, released Sep 3, 2026, priced at $10 per million input tokens and $50 per million output tokens in the API, with a 1.05 million token context. In ChatGPT it powers GPT-6 Pro and is in ChatGPT Work and Codex.
GPT-6 LunaGPT-6 Luna is OpenAI's cheapest and fastest GPT-6 model, released Sep 22, 2026 at $0.10 per million input tokens and $0.50 output. OpenAI's pricing page and Oct 7 release note name it as ChatGPT's model for Free and Go, though its help articles say GPT-5.6 Luna.
GPT-6.1 SolGPT-6.1 Sol is OpenAI's mid-priced GPT-6 model, released Sep 29, 2026 at $2 per million input tokens and $10 output, which OpenAI says nearly matches GPT-6 Astra on agentic work. In ChatGPT it is only in Work and Codex; the Chat tab uses the earlier GPT-6 Sol.
GPT-6.1 TerraGPT-6.1 Terra is OpenAI's fast, low-cost GPT-6 model for visual reasoning, computer use and writing, released Oct 26, 2026 at $1 per million input tokens and $5 output. In ChatGPT it is in Work and Codex on Plus and higher plans, not in the Chat tab.
gpt-ossgpt-oss is OpenAI's family of open-weight models: gpt-oss-120b and gpt-oss-20b, released Aug 5, 2025 under the Apache 2.0 license, which run on one 80 GB GPU or a 16 GB machine. As of Nov 6, 2026 OpenAI has released no newer general open-weight model.
GPT-Rosalind and Cyber ModelsOpenAI's specialized models are only for approved organizations: GPT-Rosalind for life sciences (GPT-6 Rosalind since Oct 30, 2026) and the Daybreak cyber models GPT-5.6 Cyber and GPT-6-Cyber (Nov 5, 2026), both GPT-6 versions built on GPT-6 Astra. They are in ChatGPT Work, Codex and the API, not the Chat tab.
OpenAI BenchmarksAs of Nov 6, 2026, no OpenAI model leads the main independent leaderboards: GPT-6 Astra scores 57 on Artificial Analysis's index behind Gemini 4 Carbon (60) and Claude Opus 5.5 (59), ranks 2nd on LMArena WebDev and 37th on LMArena Text, while OpenAI's own tables show it ahead on many agent, math and cyber tests.
OpenAI Reasoning ModelsOpenAI's reasoning models, the "o" series from o1-preview (Sep 12, 2024) through o3 and o4-mini (Apr 16, 2025), think before answering. GPT-5 merged them into its main models in August 2025, and today reasoning is a level you pick in ChatGPT (Medium to Extra High) or an effort setting in the API.
Retired ChatGPT ModelsEvery model OpenAI removed from ChatGPT, with dates: GPT-4o, GPT-4.1, o4-mini and GPT-5 on Feb 13, 2026, GPT-5.1 on Mar 11, GPT-5.2 on Jun 12, GPT-4.5 on Jun 26, o3 on Aug 26 and GPT-5.5 on Oct 14, 2026. Models generally stay 90 days after a successor arrives.