Fenia Christopoulou @fenchri
Reinforcement Learning @poolsideai Prev @Huawei @OfficialUoM @Manchester_NLP @ecentua fenchri.github.io Athens, Greece Joined April 2012-
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Laguna M.1 and XS.2 now support 256K context. Laguna M.1 is now live with a 256K context window on the Poolside API and OpenRouter. With this update, it reaches 45.8% on Terminal-Bench 2.0, improving long-horizon performance. Laguna XS.2 is also moving to 256K today, with the updated config already available on Hugging Face. Both models remain free to use. Over 1T tokens have been processed since launch 4 weeks ago. Excited to see what people build with the longer context window.
Technical report is finally out 🚀
Today we’re publishing the technical report behind Laguna M.1 and Laguna XS.2. This report opens up more of what went into them: Model Factory, pre-training data, distributed training, post-training, agent RL, quantization, and evaluation. poolside.ai/assets/laguna/…
Poolside is hosting a 2-day model research hackathon in London. Join us to push an open-weight agent model as far as you can. RL and fine-tune Laguna XS.2, our latest-generation model, on Prime Intellect Lab. Dates: May 29–30 Partners: @nvidia + @PrimeIntellect + @huggingface Prize: NVIDIA DGX Spark Agents need better models. Better models need cracked researchers. Link below.
We're releasing <𝙿𝚘𝚘𝚕𝙴𝚟𝚊𝚕.../> today, an open-source component for rendering eval charts. We built this to power the dozens of eval charts on poolside.ai, and now you can use it too. Accessible, beautiful, configurable, touch friendly and parseable at a glance. Useful for model providers, harness developers and researchers alike. pooleval.vercel.app
Couldn't find a good solution for displaying eval charts, so built a new component from scratch with animation, touch friendly tooltips, a11y, model provider logos and more. Open sourcing soon ✨
Today we’re releasing Laguna M.1 and Laguna XS.2, our first public models. Laguna XS.2 is our first open-weight release, with weights available today on Hugging Face: huggingface.co/poolside/Lagun… A few details on what went into them: large-scale pre-training, data mixture optimization, synthetic data, optimizer efficiency, and async agent RL.
Today we're launching our first public Poolside models: Laguna M.1 and Laguna XS.2, and we've built ❈Shimmer, an instant-on VM sandbox with Poolside Agent pre-installed so you can try them out. Go play out our new models for free, and build something fun → shimmer.run
Beyond excited and proud to finally share what we have been building at @poolside! ✨Laguna XS.2 and M.1 are out! ✨
Today we’re releasing Laguna XS.2, Poolside’s first open-weight model. It’s a 33B total / 3B active MoE model built for agentic coding and long-horizon tasks. Trained fully in-house on our own stack. Runs on a single GPU. Released under Apache 2.0. Links 👇 Weights:
✨ Excited to be at @NeurIPSConf in San Diego next week with the team at @poolsideai ⛱️ Booth #913! If you’re building, researching, or thinking about the next wave of AI systems, especially around RL and agentic workflows, I’d love to connect. Ping me if you’re around! ✨
Better late than ever, finally, code is available🙂 💻github.com/huawei-noah/no…
Happy to share our work on "Text2Code Generation with Modality-relative Pre-training" w/ @gcsanity & @glampouras_NLP, accepted at #EACL2024! 🎉 We propose to treat code and natural language as different modalities. 📜arxiv.org/abs/2402.05783 💻coming soon (pending int. review)
@alexandraxron @LukeZettlemoyer @licwu @albrechtschmidt Congrats Alexandra! 🎉
Research Scientist (permanent) positions just opened in our NLP team in London - Huawei Noah's Ark Lab! Looking for experienced researchers to help us tackle some interesting (and persistent) questions :) Take a look and apply if interested: huaweiuk.teamtailor.com/jobs/4981873-r…
@ebriakou @umdclip @MarineCarpuat Congrats Eleftheria! 🎉
Delighted to present our #naacl2024 paper, #HumanRankEval: Automatic Evaluation of #LMs as Conversational Assistants with @glampouras_NLP and @iiacobacNLP providing fast, reliable and private evaluation of instruction-tuned #LLMs. A truly new eval paradigm, no #gpt4-as-a-judge :)
Checkout our latest work!
🚀 Excited to share our new pre-print: "Human-like Episodic Memory for Infinite Context LLMs"! We introduce EM-LLM, a novel approach integrating cognitive science insights into LLMs for vastly extended context processing: arxiv.org/pdf/2407.09450 What we did: · 📊 We treat LLMs'
@nicolayr_ Thank you! Slides will be shared in my webpage soon! Not sure about materials from other speakers though :/
So happy to be back to MCR for this talk! Thanks again for the invitation!
@chenghua_lin @csmcr @UoMSciEng After a short break, Dr Fenia Christopoulou (@fenchri), Research Scientist at @Huawei Noah’s Ark Lab, presents on Natural and Programming Language Models! 🦾 #ADSAI2024 @nactem_unimcr
Looking to grow our NLP team in London - Huawei Noah's Ark Lab! We have positions for Research Scientists (permanents) and Engineers (contractors), where they will conduct academic and applied research in NLP and ML. Details below: huaweiuk.teamtailor.com/jobs/4209412-r… linkedin.com/jobs/view/3912…
@mikrikouventa @PanosJee Παιδιά βάλσαμο αυτή η κουβέντα, keep up the good work :)
Andreas Vlachos @vlachos_nlp
5K Followers 1K Following Professor in NLP/ML at @Cambridge_CL, member of the PaNLP group: https://t.co/CcOYgtiRTv, Fellow of @FitzwilliamColl, @ELLISforEurope member
Pasquale Minervini @PMinervini
10K Followers 5K Following Research in ML/NLP at @EdinburghNLP (tenured faculty at @EdinburghUni), Co-Founder @Miniml_AI, @ELLISforEurope Scholar, https://t.co/5dUI3EFMmW
Iacobacci et al. @iiacobacNLP
464 Followers 763 Following * Language is a different kind of beast * NLP Expert. ELM Europe [email protected]
Mehdi Rezagholizadeh @mrgzadeh
346 Followers 556 Following Principal Research Scientist, Advanced Micro Devices (AMD); PhD from Centre for Intelligent Machines (CIM), McGill University
Chryssa Zerva @chryssaZrv
422 Followers 329 Following Assistant Professor @informatica_IST, @ist_tecnico. Interested in understanding uncertainty in data, models, life. NLP, ML and climbing fan.
Jerry Spanakis 🟥 �... @gerasimoss
1K Followers 2K Following he/him, assist. prof. @MaastrichtU, #datascience #ML #NLProc for people - social computing, PI @VOXReality_eu, co-org @NllpWorkshop, #avgeek ✈️ , views my own
Antonis Anastasopoulo... @anas_ant
3K Followers 2K Following Assist. Prof at George Mason CS #nlproc MT, ASR, and documentation of endangered languages.
Christos Baziotis @cbaziotis
517 Followers 489 Following Machine Learning @cohere | Previously PhD @InfAtEd, @MetaAI (FAIR) and @AmazonScience.
Sophia Ananiadou @SAnaniadou
942 Followers 138 Following Professor, Computer Science, Univ. Manchester, Natural Language Processing, Turing Fellow, National Centre for Text Mining
Dennis Ulmer 🦋 @dnnslmr
1K Followers 1K Following Inactive profile, not deleted (for now) to prevent impersonation. Find me on the other platform. Postdoc @uva_amsterdam on uncertainty & generalization in NLP
NLLP Workshop @NllpWorkshop
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Sebastian Riedel (@ri... @riedelcastro
16K Followers 456 Following Researcher in NLP/ML @deepmind, @ucl_nlp, @[email protected] on Mastodon
Nehal Amin @NehalAmin03
10 Followers 1K Following Open-source AI & robotics enthusiast exploring the future of intelligence, space tech, internet systems, mobile computing, databases, and digital infrastructure
Young D. Kwon ✈️ ... @YoungDKwon1
423 Followers 2K Following AI Scientist @ Samsung AI | Shipped on-device GenAI to Galaxy flagships (S24 · S25 · S26) | Visiting Scholar & PhD @ Cambridge | ML & Systems Rising Star (2025)
Jian Su @JianSuji
77 Followers 5K Following IID Blender. “The first principle is that you must not fool yourself and you are the easiest person to fool.”
Pierre-Yves Ritschard @pyr
2K Followers 281 Following slacker, climber, yak shaver. founding engineer and CTO @poolsideai
qrosseel @RosseelQuinten
3 Followers 388 Following
Robert Scoble @Scobleizer
586K Followers 50K Following San Francisco/Silicon Valley AI | Robots, holodecks, BCIs, analysis of new things | Ex-Microsoft, Rackspace, Fast Company | Wrote eight books about the future.
Vinh Nguyen @vinhnx
1K Followers 7K Following Learn by doing • Building VT Code, open source coding agent https://t.co/1ZsOIycYOz • Views are my own • Support: https://t.co/P4Hz19mgKX
Vibe Coding with Gene @with_gene2626
70 Followers 572 Following Vibe coder & AI expert turning ideas to working prototypes fast, shipping tools, automations, & experiment posts that actually help you. 20+ yrs digital mktg.
David Oh @DavidChanseok
110 Followers 7K Following AI Quantization & Optimization. Corp Dev. Views are my own. Unless they were influenced by others. JK. It’s probably influenced by others.
darthgera123 @PulkitRega
757 Followers 2K Following PhD @cvssp_research |Applied Scientist @Flawlessai | Computer Vision | Ex: @VcaiMpi @iiit_hyderabad| Ryan Gosling Meme Enjoyer
Ivan M @med_1v
1 Followers 3K Following
Stefano Fiorucci @theanakin87
571 Followers 1K Following 🌱 LLM RL Environments free course: https://t.co/G7srHK7zAl | AI/SW Engineer 🧑🚀 | Building @haystack_ai OSS LLM framework | Tinkering with Post-Training, RL, SLM
Ashwin Vaswani @ashwin_vaswani
2K Followers 6K Following Research Scientist @GoogleDeepMind | Prev: @CarnegieMellon | @GoogleIndia | APPCAIR, @BITSPilaniGoa | @qtimlab, Harvard
Christian Mürtz @chrismuertz
17 Followers 96 Following Member of Engineering @poolsideai | Post-Training
Young @younqchan
357 Followers 5K Following In pursuit of new foundations for (OOD) generalizable learning, system 2 reasoning, and scientific discovery with causality.
Jing Guo @guojing0
269 Followers 3K Following MSc in Math from @uni_regensburg; BSc in Math and CS minor from @UUtah AI4Math & ML/DL & Extremal comb, TCS, and number theory
etareduce @jimexist
225 Followers 3K Following Currently working on generative AI; previously engineering manager @Airbnb, ex Startup Cofounder, Apache Arrow committer, tech leadership, Rust, AI, etc.
VioP @AcousimHss
167 Followers 1K Following the more you laugh the more you cry the more you cry the more you laugh models @rumik_ai
Swarnim Jain @swar_ja
2K Followers 2K Following cs @cambridge_uni, summer fellow @ycombinator | prev. @iitbombay
Taishi Nakamura @taishinakamura_
3K Followers 7K Following Working on scalable and efficient LLM (MoE pretraining, RL, reasoning). PhD student at @sciencetokyo_en Intern @SakanaAILabs
Guohao Li 🐫 @guohao_li
14K Followers 4K Following Founder @Eigent_AI / @CamelAIOrg. Scaling RL Environments for Agents. Prev Oxford, KAUST, ETHz, Intel, Kumo.
Nathan Benaich @nathanbenaich
71K Followers 35K Following solo member of superinvestment staff @airstreet @airstreetpress @stateofai @raais
Eiso Kant @eisokant
11K Followers 3K Following Co-founder & Co-CEO @poolsideai “The best way to predict the future is to invent it.” - Alan Kay
Yorgos Pantis @yorgos_pantis
110 Followers 1K Following Ph.D. studies @uoaofficial and @ArchimedesUnit. Ex-research @MIT, @dtutweet, @athenaRICinfo, @studyatctu, @mpiMathSci. Ex-studies @UniofOxford, @upatras.
erwtokritos @erwtokritos
642 Followers 1K Following
elie @eliebakouch
17K Followers 4K Following training llm @PrimeIntellect (prev: @huggingface) anon feedback: https://t.co/JmMh7Sg3mL
Victor Storchan @victorstorchan
1K Followers 4K Following Evals @poolsideai Prev. @jpmorgan, @ICMEStanford, @ENSdeLyon
carmocca @carmocca
60 Followers 235 Following scalability & pretraining at @poolsideai previously: open-source at @lightningai
Andrea Badia @Badiaserra
1K Followers 1K Following Leading Business Operations at @poolsideai. Previously: Growth investor at @Lakestarvc and Investment Banker at @JPMorgan
Jason Warner @jasoncwarner
38K Followers 2K Following Now: Co-founder @poolsideai Board Bridgewater, @atlassian Then: CTO @github @heroku @canonical BS CS @penn_state MS CS @rpi
(((ل()(ل() 'yoav)))... @yoavgo
82K Followers 2K Following
Yann LeCun @ylecun
1.2M Followers 788 Following Professor at NYU & Executive Chairman at AMI Labs. Ex-Chief AI Scientist at Meta. Researcher in AI, Machine Learning, Robotics, etc. ACM Turing Award Laureate.
Andreas Vlachos @vlachos_nlp
5K Followers 1K Following Professor in NLP/ML at @Cambridge_CL, member of the PaNLP group: https://t.co/CcOYgtiRTv, Fellow of @FitzwilliamColl, @ELLISforEurope member
Pasquale Minervini @PMinervini
10K Followers 5K Following Research in ML/NLP at @EdinburghNLP (tenured faculty at @EdinburghUni), Co-Founder @Miniml_AI, @ELLISforEurope Scholar, https://t.co/5dUI3EFMmW
Iacobacci et al. @iiacobacNLP
464 Followers 763 Following * Language is a different kind of beast * NLP Expert. ELM Europe [email protected]
Sebastian Ruder @seb_ruder
99K Followers 1K Following Research Scientist @AIatMeta MSL • Ex @Cohere @GoogleDeepMind
AI at Meta @AIatMeta
806K Followers 323 Following Together with the AI community, we are pushing the boundaries of what’s possible through open science to create a more connected world.
EMNLP 2026 @emnlpmeeting
17K Followers 53 Following EMNLP 2026 - The 2026 Conference on Empirical Methods in Natural Language Processing Hashtag: #EMNLP2026 Dates: October 24 –29 Submission: ACL ARR March and May
Kyunghyun Cho @kchonyc
86K Followers 2K Following a mediocre combination of a mediocre scientist and a mediocre advisor at @nyuniversity (@CILVRatNYU)
Jonas Pfeiffer @PfeiffJo
3K Followers 684 Following Research Scientist @GoogleDeepMind | @AdapterHub | previously @nyuniversity @TUDarmstadt @UKPLab @MetaAI @spotify | https://t.co/oPoAvcAx97 | (he/him)
Mehdi Rezagholizadeh @mrgzadeh
346 Followers 556 Following Principal Research Scientist, Advanced Micro Devices (AMD); PhD from Centre for Intelligent Machines (CIM), McGill University
Edward Grefenstette @egrefen
46K Followers 915 Following FR/US/GB AI/ML Person, Director of Research at @GoogleDeepMind, Honorary Professor at @UCL_DARK, @ELLISforEurope Fellow. All posts are personal.
François Chollet @fchollet
694K Followers 825 Following Co-founder @ndea. Co-founder @arcprize. Creator of Keras and ARC-AGI. Author of 'Deep Learning with Python'.
Jay Alammar @JayAlammar
49K Followers 1K Following Machine Learning Researcher and writer https://t.co/5GlbofAHs0. O'Reilly Author https://t.co/Fl3uPAZHLg. LLM Builder @Cohere.
AK @_akhaliq
504K Followers 3K Following AI research paper tweets, ML @Gradio (acq. by @HuggingFace 🤗) dm for promo ,submit papers here: https://t.co/UzmYN5XOCi
Chryssa Zerva @chryssaZrv
422 Followers 329 Following Assistant Professor @informatica_IST, @ist_tecnico. Interested in understanding uncertainty in data, models, life. NLP, ML and climbing fan.
Barbara Plank @barbara_plank
9K Followers 958 Following I moved to a new sky, find me there. Account no longer active. https://t.co/wnGfbtVgZ3
Luca Soldaini 🎀 @soldni
13K Followers 1K Following data mines are my passion ⛏️ mts @MicrosoftAI / ex co-lead Olmo @allen_ai / pfp @YanhongLi2062 / thoughts are mine, leave my employer alone / 🌈
Pierre-Yves Ritschard @pyr
2K Followers 281 Following slacker, climber, yak shaver. founding engineer and CTO @poolsideai
Guohao Li 🐫 @guohao_li
14K Followers 4K Following Founder @Eigent_AI / @CamelAIOrg. Scaling RL Environments for Agents. Prev Oxford, KAUST, ETHz, Intel, Kumo.
himanshu @retr0sushi_
3K Followers 3K Following building in cybersec + ai, prev world models @lossfunk
Mariana Castilho @mrncst
18K Followers 487 Following software design & code @poolsideai — prev. @vercel @v0 @pierrecomputer
Liam Fedus @LiamFedus
35K Followers 1K Following Building industrial-scale science at @periodiclabs Past: VP of Post-Training @OpenAI; Google Brain
Rishabh Agarwal @agarwl_
22K Followers 848 Following Reinforcement Learner @periodiclabs, Adjunct Prof at McGill. Ex Meta, DeepMind, Brain, @iitbombay. NeurIPS Best Paper, On-Policy Distillation
elie @eliebakouch
17K Followers 4K Following training llm @PrimeIntellect (prev: @huggingface) anon feedback: https://t.co/JmMh7Sg3mL
Brian Fitzgerald @bfitzgerald242
427 Followers 6K Following post training @poolsideai, previously @StabilityAI
Margarida Garcia @margaridagsl
584 Followers 3K Following VP Ops @poolsideai • Past: VP Ops @athenian • Principal @BeaconCap • COO @lifebitAI • VP of Dev Relations @sourcedtech
Andrea Badia @Badiaserra
1K Followers 1K Following Leading Business Operations at @poolsideai. Previously: Growth investor at @Lakestarvc and Investment Banker at @JPMorgan
ICLR @iclr_conf
60K Followers 57 Following International Conference on Learning Representations #ICLR2027. SPC is @jacobandreas and GC is @BharathHarihar3
ujj bsky social @uinelj
141 Followers 607 Following account in readonly data @poolsideai find me at butterfly site: https://t.co/wYEOzbuP0o https://t.co/vItSJ1xGPO
Mitchell Hashimoto @mitchellh
203K Followers 146 Following Creator of Ghostty. 👻 Prev founded @HashiCorp, created Vagrant, Terraform, Vault, and others.
Waren Long @warenlg
254 Followers 319 Following Data Pretraining Lead @poolsideai | prev Head of Product @athenianco | prev ML Engineer @sourcedtech
Aleksei Petrov @ya_petrovalex
20 Followers 44 Following Founding Engineer, Post-Training Research Lead @poolsideai
carmocca @carmocca
60 Followers 235 Following scalability & pretraining at @poolsideai previously: open-source at @lightningai
Jason Warner @jasoncwarner
38K Followers 2K Following Now: Co-founder @poolsideai Board Bridgewater, @atlassian Then: CTO @github @heroku @canonical BS CS @penn_state MS CS @rpi
George Grigorev @iamgrigorev
4K Followers 1K Following pretraining @poolsideai, x- @togethercompute @snap rare specialty coffee lover
Stanford AI Lab @StanfordAILab
253K Followers 337 Following The Stanford Artificial Intelligence Laboratory (SAIL), a leading #AI lab since 1963. ⛵️🤖 Emmy-winning video: https://t.co/lV9smZTC1m
Lightning AI ⚡️ @LightningAI
47K Followers 89 Following The AI omnicloud PyTorch developers love. Made the first AI Studio & PyTorch Lightning. Get help: https://t.co/a69wnEBpKH
Alex Zelenka Martin @alexdzm
259 Followers 814 Following Tweets are occasionally technical and often cynical. Evals @poolsideai | ex @10DowningStreet @AISecurityInst @orcacomputing
Filippos Christianos @f_christianos
452 Followers 308 Following Research Scientist working on LLMs and Multi-agent Deep Reinforcement Learning. More at https://t.co/18sov1fkDK
SzymonOzog @SzymonOzog_
3K Followers 289 Following Maximizing throughput at @poolsideai Educating people about GPUs at https://t.co/81rRJ4KoUt I like my tea green and my compute parallel
🇺🇦 Dzmitry Bahd... @DBahdanau
11K Followers 41 Following Team member at @periodiclabs. Adjunct Prof @ McGill. Member of Mila, Quebec AI Institute. Stream of consciousness is my own.
Together AI @togethercompute
56K Followers 374 Following Accelerate inference, model shaping, and pre-training on a research-optimized platform.
Google Labs @GoogleLabs
210K Followers 73 Following Google’s home for our latest AI tools and experiments.
Ariel @redtachyon
5K Followers 273 Following p/hd | Big RL energy | Prev. {Meta FAIR RE; Gym(nasium) maintainer} | Not French | Technology Sibling
Nathan Lambert @natolambert
88K Followers 902 Following Open model research @ something new. Prev. co-led Olmo at Ai2. Contact via email. Writes @interconnectsai Wrote The RLHF Book, 🏔️🏃♂️
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