GPT 5.5

1. Testing GPT-5.5 in early access: what we are seeing so far (lovable.dev via hn)

   +21 1h gpt-5

   Lovable has been testing GPT-5.5 in early access and our evals show it's the most capable model we've tested for getting builders unblocked and is meaningfully stronger than GPT-5.4 on the more complex tasks that can stall a build session.…

2. GPT-5.5 Prompting Guide (simonwillison.net via hn)

   +31 3h gpt-5openai

   25th April 2026 - Link Blog GPT-5.5 prompting guide. Now that GPT-5.5 is available in the API, OpenAI have released a wealth of useful tips on how best to prompt the new model.

3. Updated ChatGPT vs Claude vs Gemini vs Grok subscription (www.reddit.com)

   +32 3h grokgeminiopus+1

   I've made an update to my popular post here: https://www.reddit.com/r/ChatGPT/s/WKm72QCRXm Lots of things are happening on ChatGPT & Claude side (gpt-image-2, Claude Design, new models like GPT 5.5 and Opus 4.7, ChatGPT rolls out $100/plan…

4. GitHub Copilot: GPT-5.5 7.5x more expensive under promotional pricing than 5.4 (docs.github.com via hn)

   +31 4h copilotgpt-5

   Important - Premium requests for Spark and Copilot cloud agent are tracked in dedicated SKUs from November 1, 2025. This provides better cost visibility and budget control for each AI product.

5. GPT 5.5 seems to have more syncophancy than 5.4 (www.reddit.com)

   12 5h

6. Astonishing Contradiction in OpenAI's 5.5 System Card (www.reddit.com)

   +43 7h gpt-5openai

7. Preventing Message Burnout (www.reddit.com)

   +11 8h gpt-5

8. GPT-5.5's SimpeBench scores are out (www.reddit.com)

   +11046 8h gpt-5

9. Why did OpenAI stop releasing “chat” api models? (www.reddit.com)

   +2125 10h gpt-5openai

10. GPT 5.5 sets new record in proofreading benchmark (revise.io via hn)

    +31 10h

11. GPT-5.5 with 1M context Window (www.reddit.com)

    1 11h gpt-5codexcursor

12. OpenAI Pres. Greg Brockman on GPT-5.5 "Spud", Model Moats and 'Compute Economy' (www.bigtechnology.com via hn)

    +3 11h gpt-5openai

13. GPT-5.5 is generally available for GitHub Copilot (github.blog via hn)

    +226 12h copilotgpt-5

14. GPT-5.5 has pulled ahead of Opus for accounting and finance tasks (twitter.com via hn)

    +2 13h gpt-5opus

15. gpt 5.5 is good but I'm having hallucination/context issues (www.reddit.com)

    +514 13h hallucination

16. OpenAI releases GPT-5.5 and GPT-5.5 Pro in the API (developers.openai.com via hn)

    +232126 14h gpt-5openai

17. Is anyone else getting a bug where images are triggered on thinking mode and then never actually complete (www.reddit.com)

    +43 14h

18. Food for Agile Thought #541: GPT-5.5, Product Managers&Trouble, Product on Speed (age-of-product.com via hn)

    +1 18h gpt-5

19. OpenAI should open-source text-davinci-003 — here's why it makes zero sense to keep it closed (www.reddit.com)

    9 19h gpt-4grokgpt-5+1

20. what is cut off knowledge date for GPT 5.5? (www.reddit.com)

    +13 22h

21. How can GPT 5.5 Pro be lower than GPT 5.4 Pro on the benchmark of HLE (w/ tools)? (www.reddit.com)

    +5310 1d

22. Tell HN: Codex macOS app switches to Fast speed after update without asking (news.ycombinator.com)

    +41 1d gpt-5codexopenai

23. GPT-5.5 vs. Claude Opus 4.7: Which one is ACTUALLY cheaper? (www.reddit.com)

    +76 1d gpt-5opus

24. Big model feel with GPT 5.5 (www.reddit.com)

    +22271 1d

25. Are the new models only better because they are more expensive? (www.reddit.com)

    17 1d gpt-5openai

26. Pro vs plus for gpt 5.5 pro? (www.reddit.com)

    +31 1d codexclaude-code

27. Outputs from GPT 5.5 I'd like to see (www.reddit.com)

    +12 1d codex

28. thoughts on GPT 5.5 (www.reddit.com)

    +136452 1d

29. GPT-5.5 rollout — anyone actually seeing it yet? (www.reddit.com)

    3 1d gpt-5

30. People switching back from Anthropic to OpenAI after the GPT-5.5 announcement (www.reddit.com)

    7 1d gpt-5anthropicopenai

31. GPT 5.5 is the AGI (www.reddit.com)

    2 1d

32. Codex GPT 5.5 will not currently run without being in a sandbox with the newest version 0.124 alpha 2. Full permissions do not work even when set (www.reddit.com)

    +72 1d codex

33. GPT 5.5 scores 1.7% on OpenAI-proof Q&A—an internal benchmark testing performance on real ML problems encountered during the process of research and engineering (www.reddit.com)

    +12933 1d openai

34. codex --model gpt-5.5 Not updated in the CLI yet (www.reddit.com)

    +23 1d gpt-5codex

35. Anyone using GPT 5.5? Drop your feedback (www.reddit.com)

    +1314 1d gemini

36. A pelican for GPT-5.5 via the semi-official Codex backdoor API (simonwillison.net)

    1d securitygpt-5codex

37. Is the AI subscription bubble starting to crack? GPT-5.5 just dropped, prices keep rising, and the “all-you-can-eat” era looks more fake by the month (www.reddit.com)

    +3472 1d gpt-5codexanthropic+2

38. Page 15 of the GPT-5.5 System Card: " Our analysis estimates that GPT-5.5 is slightly more misaligned than GPT-5.4 Thinking across several categories, though nearly all of this is low-severity misalignment. " (www.reddit.com)

    +406 1d gpt-5openai

39. Mythos destroys GPT 5.5 on shared benchmarks (www.reddit.com)

    +156134 1d mythos

40. GPT 5.5 xHigh, high, and medium Artificial Analysis Index results (www.reddit.com)

    +13019 1d

41. GPT-5.5's Unicorn (www.reddit.com)

    +12715 1d gpt-5

42. Chat GPT 5.5 got launched and we got some really bold words by Sam Altman. Thoughts? (www.reddit.com)

    +356217 1d altmancodex

43. The GPT-5.5 System Card was probably not written by GPT-5.5 (www.reddit.com)

    +599 1d gpt-5openai

44. GPT-5.5 benchmark results have been released (www.reddit.com)

    +459162 1d gpt-5openai

45. Introducing GPT-5.5 (openai.com via reddit)

    +831290 1d gpt-5

46. GPT-5.5 Bio Bug Bounty (openai.com)

    2d securitygpt-5

47. Caught the massive OpenAI Codex model leak on video before it was patched! (GPT-5.5, Arcanine, Glacier-alpha) (www.reddit.com)

    +13021 3d gpt-5agenticcodex+1

48. GPT 5.5 Released in Codex (news.ycombinator.com)

    +112 3d gpt-5agenticcodex

49. I can’t sleep. (www.reddit.com)

    +4567 3d grokmythoscodex

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