Let’s read carefully:
Pro and Team tier users have access to GPT-5 Thinking Pro, which takes a bit longer to think but delivers the accuracy you need for complex tasks.
Then also consider:
That gives us a picture of what Pro delivers: more reasoning, additionally, more context window than Plus subscribers.
gpt-5-chat-latest , the non-thinking version for your experimentation, demonstrates that ChatGPT runs differently-trained models, happy to blast emojis at you while asking what to do next. Pro in ChatGPT would follow that pattern, thus, maybe not the actual model you want.
Analysis:
API developers can send all the input context they want to pay for:
And turn up that thinking time:
And have the AI produce more:
Conclusion:
You can crank up the model to your billing tolerance levels, and get an AI that is steerable instead of always “You are ChatGPT”.
OpenAI has not stated that GPT-5-Pro is more than extra thinking production.
The deprecations info has o1-mini not shut off yet (2025-10) and o1 still running without announcement, as an idea of how long API models are maintained.