Lesson 1165 of 1570
Why AI Model Names Change So Often (Claude 4.5, GPT-5, Gemini 2.5)
Models update every few months. Knowing the version matters because behavior, price, and limits all change between releases.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1The big idea
- 2model versions
- 3deprecation
- 4Claude 4.5
Concept cluster
Terms to connect while reading
Section 1
The big idea
AI labs ship new model versions constantly — Claude 3, 3.5, 4, 4.5, 4.7; GPT-4, 4o, 5, 5.1; Gemini 1.5, 2.0, 2.5. Each version has different strengths, prices, and quirks. APIs let you pin a version; chat apps usually default to the latest.
Some examples
- You wrote a tutorial using Claude 3.5 Sonnet last year — Claude 4.5 may handle the prompt differently now.
- Your app pinned to GPT-4 still works — but GPT-5 is cheaper and better, time to update.
- Gemini 2.5 fixed the long-context regressions from 2.0 — re-test before judging.
- Old model 'gpt-3.5-turbo' is being deprecated — your code calling it will break.
Try it!
Check which model your favorite chat app currently uses (in settings). Note the version. Now you'll notice when it changes.
Key terms in this lesson
End-of-lesson quiz
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