← Glossary Model
GPT-5.5
OpenAI's 2025 flagship model, predecessor of the GPT-5.6 family.
GPT-5.5 was OpenAI’s flagship model before the GPT-5.6 generation arrived in mid-2026. It still powers parts of ChatGPT, including portions of the free tier.
Model names change fast; what matters for readers is the pattern. Each generation gets cheaper per unit of capability, and yesterday’s flagship becomes today’s free tier.
Mentioned in
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Light to Ultra: Making Sense of GPT-5.6's Seven Thinking Speeds
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OpenAI Says GPT-5.6 Sol Trained Its Own Smaller Sibling
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Why Databricks Just Made a Chinese Open-Source Model Its Daily Coding Engine
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Meta Joins the AI Price War With Muse Spark 1.1 and Its First Developer API
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Grok 4.5 Arrives at a Third of the Price — and That Might Matter More Than Benchmarks
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ChatGPT's New Voice Mode Can Listen and Talk at the Same Time
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Researchers made AI models run a startup for 500 days. Most went bankrupt.