A false narrative is being shared that GPT 5.5 ties with Mythos on several benchmarks as if that made them equivalent. What's being overlooked is that GPT 5.4 was already on par with Mythos in those benchmarks, except for Terminal Bench 2.0…
AI
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Tool Use and Self-Check as Core AI Workflow Components
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Excited to compare in my workflows. Tool use + self-check is basically the whole game now.
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Big Tech’s 4x Move: Platform Power Through Market Dominance
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Calling the 4x move "platform power" is generous, it's just because they can.
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Testing AI Model 5.5 Beyond Benchmark Limitations
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yep. I think benchmarks only tell half of the truth. Going to test 5.5 now
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Poor indexing of legacy appliance manuals frustrates users
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haha the worst part is opening a manual for an old washer or appliance now and realizing nobody indexed it for retrieval
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27B Model Running Locally on 5090 Beats Frontier Model
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A 27B running locally on a 5090 beating a frontier model is where 2026 actually gets interesting.
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GPT-5.5 Pro Reaches Claude Mythos Level Performance
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From an eval perspective, GPT-5.5 pro is Claude Mythos level but for public use.
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AI Model Selects Correct Method from Research Paper Appendix
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45 → 65 is something! crazy that it picked the right method from a paper appendix. I know many PhDs that dont even spend the time going over the appendices haha
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OpenAI Releases GPT-5.5 Most Capable Model Yet
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GPT-5.5 evals are crazy – and what we have hoped for.
— Chubby♨️ (@kimmonismus) 23 avril 2026
Whats new? the tl;dr
OpenAI just dropped GPT-5.5, their "most capable model yet", which matches GPT-5.4's latency while delivering significantly higher intelligence across coding, knowledge work, and scientific research.… https://t.co/fDII5T1KeV pic.twitter.com/qdhXhPiWSfGPT-5.5 evals are crazy – and what we have hoped for. Whats new? the tl;dr OpenAI just dropped GPT-5.5, their "most capable model yet", which matches GPT-5.4's latency while delivering significantly higher intelligence across coding, knowledge work, and scientific research.
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Developers Share GPT-5.5 Building Experiences in Coffee Chats
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Thanks so much @clairevo
, @willkoh_kc
, and @AaronFriel for joining me for these quick coffee chats and sharing what building with GPT-5.5 felt like. Loved seeing what you made with it!