InactiveThis topic has no meaningful new developments right now.
FollowChatGPT Model Development Path
GPT-5.x consolidated the stack into tiers
Key takeaways
- The ChatGPT roadmap is no longer a simple GPT-3.5 to GPT-4 to GPT-5 ladder; users now experience a routed stack of flagship, reasoning, and fallback models.
- Product changes increasingly happen through routing rules, retirements, and usage-tier fallbacks, so model access can change even when the chat UI looks the same.
- The timeline shows capability gains coming from multimodality, RLHF and post-training, and specialized reasoning branches as much as from classic scale alone.
Topic tags
News outlets