Answer · Writing
What AI models does ChatGPT use?
ChatGPT runs on GPT Image (OpenAI), GPT-5.2 (OpenAI), GPT-5.2 Thinking (OpenAI), GPT-5.4 (OpenAI), gpt-5.6 (OpenAI) and gpt-6-astra (OpenAI), and routes requests between them.
- Models used
- 6
- Primary model
- GPT Image
- Public API
- Yes
- Last checked
- 2026-09-12
Model claims are labelled by how we know them: GPT Image — disclosed, GPT-5.2 — disclosed, GPT-5.2 Thinking — disclosed, GPT-5.4 — disclosed, gpt-5.6 — disclosed and gpt-6-astra — disclosed. "Disclosed" means the vendor says so in public; "inferred" means it was derived from documentation, headers or release notes.
Context window: 196K tokens on Plus.
Other stack signals: Model router and MCP connectors.
Cite this answer
Tomorrow. “What AI models does ChatGPT use?” Tomorrow AI & Emerging Tech Index, AlienSquad, updated 2026-09-12. https://tomorrow.aliensquad.ai/q/what-models-does-chatgpt-use
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