Op
OpenAI
OpenAI (GPT / ChatGPT)
Multimodal modelSince 2018
OpenAI's flagship assistant built on the GPT model line — text, vision, voice, and tool use in one app.
Version timeline as of Jul 22, 2026.
Version timeline
36 versions- gpt-5.5· 1M ctx · cutoff Jan 1, 2026 · Flagship
Current flagship general-purpose model; strong coding, reasoning, writing, and agentic tasks. Tiered pricing above a context threshold.
- GPT-5.5 ProActivegpt-5.5-pro· 1M ctx · cutoff Jan 1, 2026 · Reasoning
Maximum-reasoning-depth variant of GPT-5.5 for research-grade problems ($30/$180 per 1M).
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