
A successor only counts if they have a name that isn't o3.x or o3-x or something that contains o3. o4 counts, o5 counts, reasoning models with a different name pattern that are clearly better than o3 count.
Update 2025-04-17 (PST) (AI summary of creator comment): Benchmark Results as Evidence:
The successor does not need to be officially released; showing benchmark results similar to those provided for o3 before January when the market was created is sufficient.
This clarification means that a demonstration of performance through benchmarking can count as identifying a successor even without a formal launch.
Update 2025-07-17 (PST) (AI summary of creator comment): The successor must be a major model that is widely considered a successor to o3. It will not resolve to simply the next model that is released.
Update 2025-07-17 (PST) (AI summary of creator comment): The creator has specified that ChatGPT agent does not count as a successor to o3.
Update 2025-08-01 (PST) (AI summary of creator comment): The position of a model in the ChatGPT model selector will not be a significant factor for resolution. The key criterion remains what model is widely considered to be the successor.
@Bayesian This is the model selector for ChatGPT Pro Plan

Let's say GPT-5 was added and became the first listed model and 4o moved down to "more models" or somewhere lower down the list but o3 stayed as #2 the whole time
What would this resolve to?
I would support a close when gpt-5 is released and poll for resolution
@realDonaldTrump Depends what it is widely considered to be, I don’t think its position in the model selector is going to affect resolution much though
do you think ChatGPT agent counts? It seems like a smarter model overall than o3, and not just at computer use, though it's not a clear Pareto improvement. Unlike o3 it's not available as a chat/general model but that's immaterial per your criteria.
system card here: https://cdn.openai.com/pdf/6bcccca6-3b64-43cb-a66e-4647073142d7/chatgpt_agent_system_card_launch.pdf
@JoshYou I guess this is downstream of the fact that I don't believe there will be a a model called o4, because if GPT-5 is a superior reasoning model to o3 then what would o4 be?
@Bayesian I’d say to give it time, since OAI might call GPT-5 their next-gen reasoner in lieu of a new reasoner in the o series
@Bayesian I understood "successor" as "the next release that Open AI tells people to use". So this would only count if o4 is actually released.
But I agree it's ambiguous...
@TimothyJohnson5c16 I would lean toward release of the successor not being required, like if they show benchmark results for o4 in a similar way that they did for o3 right before january when this market was created, that would make it a successor
@TimothyJohnson5c16 I would lean toward release of the successor not being required, like if they show benchmark results for o4 in a similar way that they did for o3 right before january when this market was created, that would make it a successor