Man, what's going on with this benchmark, it is literally getting worse with each release. "OpenAI-Proof Q&A evaluates AI models on 20 internal research and engineering bottlenecks encountered at OpenAI, each representing at least a one-day delay to a major project and in some
LLMS
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Instant Model Continues Using Version 5.3 Implementation
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An interesting detail is that for the Instant model we continue to use version 5.3
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Grok Voice Think Fast 1.0 State-of-the-Art Voice Model Launch
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Introducing Grok Voice Think Fast 1.0 A state-of-the-art voice model built for complex, multi-step workflows with snappy responses and high accuracy. It takes the top spot on the Tau Voice Bench and handles real-world messiness like noise, accents, and interruptions better than
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GPT 5.5 vs Mythos: Benchmark Performance Comparison Analysis
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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…
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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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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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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! -
LiteParse Web Version Built with Claude Code in One Hour
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That browser version of LiteParse is available here: https://
simonw.github.io/liteparse/ Detailed notes on how I built it using Claude Code (running for an hour) on my blog: https://
simonwillison.net/2026/Apr/23/li
teparse-for-the-web/
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