GPT-5.3 — Pantheon
  
- 

  
  
  
  
  
  
  
  
  
  
  
  
- 
  
  
  

  
    
      [← Pantheon](../)
      [copy as markdown](index.md)
    

    # GPT-5.3

    
OpenAI · Mar 2026
    
The “less cringe” update: Instant tuned for tone, relevance and lower hallucinations, plus GPT-5.3-Codex for agentic coding. A personality patch shipped as a version number.

    
## Sources

    
### Official

    

      
- 2026-03-03 [GPT-5.3 Instant](https://openai.com/index/gpt-5-3-instant/) — announcement.
      
- 2026-03 [Introducing GPT-5.3-Codex](https://openai.com/index/introducing-gpt-5-3-codex/) — the coding sibling.
      
- 2026-03-03 [9to5Mac: less cringe](https://9to5mac.com/2026/03/03/openai-releases-gpt-5-3-instant-update-to-make-chatgpt-less-cringe/) — press framing.
    
    
### Writing & commentary

    
tk — to collect
    
### Tweets

    
tk — fleet pass pending; mirror to archive

    
## Official record

    

      
- Hallucination reductions of 26.8% (web) / 19.7% (internal knowledge) claimed vs prior models.
      
- tk — fill from primary sources
    

    
## History

    
tk — context of the world at release; events and entanglements

    
## Impressions

    
tk — day-of and longitudinal vibes to collect
    
[← back to the Pantheon](../)