o3
No written verdict yet. Here is what commenters said.
Why people recommend it
“These were definitely significant reasoning models”
“I still far prefer o3 even if it's considered a legacy model.”
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“if you use older models (5.1 instant or o3) you get a ton of detail”
“switched to o3-thinking with web search enabled after that came out because it was 80% of the thoroughness with 20% of the time”
“April is when they started getting good, with o3 and the various deep research tools”
Caveats and dissent
“I noticed in the CoT that o3 was cheating — it pulled location data, then lied about it.”
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“they were super difficult to work with on technical tasks outside of software”
Often compared with
Who recommends it in their own words
Threads where it came up
- GPT‑5.3 Instant 2 mentions
- I know why the mathematicians weep 1 mention
- GPT 6.1 Sol: Near-Astra intelligence for a fifth of the price 1 mention
- Replies to comments on my "LLMs are eroding my career" post 1 mention
- The famous O3 "GeoGuessr" prompt did not work 1 mention
- Are LLMs not getting better? 1 mention
Data: o3.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 15
Disagree, there are in fact documented cases. > I think I have been underrating the pace of model improvements. In March 2025 I made a bet with Tamay Besiroglu, cofounder of RL environment company Mechanize, that AI tools would not be able to autonomously produce papers I judge to be at a level comparable to that of the best few papers published in 2025, at comparable cost to human experts, by 2030. I gave him 3:1 od
“the best model was o3, which was scoring 3-4%”
“from o3-2025-04-16 for $8.00 per million output tokens”
“I noticed in the CoT that o3 was cheating — it pulled location data, then lied about it.”
“These were definitely significant reasoning models”
“o3, 04-mini (crappy agentic models, BUT, that is okay”
“they were benchmaxxed so hard on math and science”
“I still far prefer o3 even if it's considered a legacy model.”
“if you use older models (5.1 instant or o3) you get a ton of detail”
“switched to o3-thinking with web search enabled after that came out because it was 80% of the thoroughness with 20% of the time”
“It was backed by o3 at the time.”
“April is when they started getting good, with o3 and the various deep research tools”
“o3 talks about watchers and marinade, and cunning schemes”
“I started with o3 and now I'm using 5.1 Thinking (set to max)”
“they were super difficult to work with on technical tasks outside of software”