YuLan by Gaoling School of Artificial Intelligence
YuLan-Mini
OLMo by Ai2
Olmo-3-1125-32B
Apertus by Swiss AI Initiative
Apertus-70B-2509
BLOOMZ by BigScience Workshop
BLOOM
SmolLM by HuggingFace
SmolLM3-3B-Base
Amber by LLM360
Amber
Open Assistant by Open Assistant
Pythia-12B
Omnilingual ASR by Meta
Omnilingual ASR
mT0 by BigScience Workshop
mT5-XXL
Whisper by OpenAI
Whisper-large-v3
Pythia by EleutherAI and Together Computer
Pythia-6.9B
K2 by LLM360
K2
Instella by AMD
Instella-3B
EuroLLM by UTTER
EuroLLM-22B-2512
Tülu by Ai2
Llama-3.1-405B
OpenChat by OpenChat
Meta-Llama-3-8B
Arabic StableLM by StabilityAI
StableLM-2-1.6B
Vicuna by LMSYS
Vicuna-13B
Teuken by OpenGPT-X
Teuken-7B-base
Skywork-OR1 by Skywork
DeepSeek-R1-Distill-Qwen-32B
MobileLLM by Meta
MobileLLM-R1-950M-base
Minerva by Sapienza Natural Language Processing Group
Minerva-7B-base-v1.0
Dolly by Databricks
Pythia-12B
T5 by Google AI
T5
RedPajama by Together Computer
RedPajama-INCITE-7B-Base
MPT by Databricks
MPT-30B
Lucie by OpenLLM-France
Lucie-7B
Eurus by OpenBMB
Mixtral-8x22B-v0.1
DeepSeek V3.2 by DeepSeek
DeepSeek-V3.1-Base
Poro by AMD Silo AI and TurkuNLP and High Performance Language Technologies (HPLT)
Llama-Poro-2-70B-Base
Neo by Multimodal Art Projection
Neo-7B
Ling by Inclusion AI
Ling-1T
BERT by Google AI
unspecified
AquilaChat by Beijing Academy of Artificial Intelligence
Aquila2-70B-Expr
Zephyr by HuggingFace
Mixtral-8x22B-v0.1
Yi by 01.AI
Yi-34B
WizardLM by Microsoft and Peking University
LLaMA-7B
TildeOpen by Tilde.ai
TildeOpen-30b
Salamandra by Barcelona Supercomputing Center
Salamandra-7B
Phi by Microsoft
Phi-4
Occiglot by Occiglot
Occiglot-7B-EU5
NeuralChat by Intel
Mistral-7B-v0.1
Llama Nemotron by NVIDIA
Llama-3.3-70B-Instruct
Guru by LLM360
Guru-32B
GPT-SW3 by AI Sweden
GPT-SW3-6.7B-V2
GPT-NeoXT by Together Computer
GPT-NeoX-20B
Fietje by Bram Vanroy
Phi-2
BTLM by Cerebras
BTLM-3B-8K-Base
Pharia by Aleph Alpha Research
Pharia-1-LLM-7B
minChatGPT by Ethan Yanjia Li
GPT2-Medium
Xwin-LM by Xwin-LM
Llama-2-13B
Mistral Large 2 by Mistral AI
Mistral-Large-2411
Kimi K2 by Moonshot AI
Kimi K2 Base
Baguettotron by PleIAs
Baguettotron
DeepSeek R1 by DeepSeek
DeepSeek-V3-Base
SynLogic by Minimax AI
SynLogic-32B
OpenMoE by Zheng Zian
OpenMoE-8B
OpenELM by Apple
OpenELM-3B
Mistral Large 3 by Mistral AI
mistral-large-2512
InternLM by Shanghai AI Laboratory
InternLM3-8B
Hunyuan by Tencent
Hunyuan-7B-Pretrain
GPT OSS by OpenAI
unspecified
Falcon by Technology Innovation Institute
Falcon-H1-34B-Base
DeepHermes by Nous Research
Llama-3.1-70B
CT-LLM by Multimodal Art Projection
CT-LLM-Base
Mistral NeMo by Mistral AI and NVIDIA
Mistral-NeMo-12B-Base
XBai-04 by Yuan Shi Technology
Qwen3-32B
Saul by Equall
Mixtral-8x22B-v0.1
Qwen by Alibaba
Qwen3-235B-A22B-Base
Granite by IBM
Granite-4.0-H-Small-Base
Apriel by ServiceNow
Mistral-Nemo-Base-2407
MiMo by Xiaomi
MiMo-7B-Base
Airoboros by Jon Durbin
Qwen1.5-110B
Starling by NexusFlow
Llama-2-13B
Solar by Upstage AI
Mistral-7B-v0.1
Gemma by Google AI
Gemma-3-27B-PT
Geitje by Bram Vanroy
Mistral-7B-v0.1
Claire by OpenLLM-France
Falcon-7B
BELLE by KE Technologies
Llama-2-13B
UltraLM by OpenBMB
Llama-13B
Llama 4 by Meta
Llama-4-Maverick-17B-128E
dots.llm1 by RedNote
dots.llm1.base
StripedHyena by Together Computer
StripedHyena-Hessian-7B
Marco by Alibaba
Marco-LLM-GLO
Bielik by SpeakLeash AI
Bielik-11B-v3-Base-20250730
Viking by Silo AI and TurkuNLP and High Performance Language Technologies (HPLT)
unspecified
Llama 3.1 by Meta
Llama-3.1-405B
Seed-OSS by ByteDance
Seed-OSS-36B-Base
RWKV by BlinkDL/RWKV
unspecified
Nanbeige by Nanbeige LLM lab
Nanbeige4-3B-Base
LongAlign by Zhipu AI
Llama-2-13B
Stanford Alpaca by Stanford University CRFM
Llama-7B
GLM by Zhipu AI
GLM-5
Llama 3.3 by Meta
Llama-3.3-70B
XVERSE by Shenzhen Yuanxiang Technology
XVERSE-MoE-A4.2B
TeleChat by Tele-AI
unknown
Stable Beluga by StabilityAI
Llama-2-70B
Snowflake Arctic by Snowflake
Snowflake-Arctic-Base
Persimmon by Adept AI Labs
Persimmon-8B-Base
OPT by Meta
OPT-30B
Minimax-M2 by Minimax AI
MiniMax-Text-01?
LFM2 by Liquid AI
unknown
Jais by G42
Llama-2-70B
Infinity-Instruct by Beijing Academy of Artificial Intelligence
Llama-3.1-70B
H2O-Danube by H2O.ai
H2O-Danube3.1-4B-Base
FastChat-T5 by LMSYS
Flan-T5-XL
EXAONE by LG
unspecified
Crystal by LLM360
Crystal
Cogito by DeepCogito
DeepSeek-V3-Base
BitNet by Microsoft
unspecified
Baichuan by Baichuan Intelligent Technology
Baichuan2-13B-Base
StableVicuna by CarperAI
LLaMA-13B
Llama 3 by Meta
Meta-Llama-3-70B
Llama 2 by Meta
Llama-2-70B
LeoLM by LAION
Llama-2-70B
Koala by BAIR
Llama-13B
XGen by Salesforce
XGen-Small-9B-Base-R
Reka Flash by Reka AI
unknown
Gemma Japanese by Google AI
Gemma-2-2B
Command A by Cohere AI
Command A?
Llama-Sherkala by G42
Llama-3.1-8B
Grok 2 by xAI
unknown
Lumo AI by Proton
Undisclosed
Latest news
02 December 2025
Mistral 3: A Heavyweight Model, Lightweight on Openness
The Mistral 3 family, including the massive 675B Mistral Large 3, fills a gap for high-performance European models and aids local data governance, it fails to set a new standard for openness.
29 August 2025
Lumo: the least open 'open' AI assistant
Proton sets a new record in open-washing
01 August 2025
BERT: The original sin of open-washing large language models
Already in 2018 Google's pioneering LLM 'BERT' was marketed as open source, leading an entire field down a dubious path.
18 July 2025
MusGO: a new openness index for the music domain
A new resource building on our openness framework
28 May 2025
YuLan-Mini: A new highly open model
Gaoling School of Artificial Intelligence releases a new highly open AI model
27 May 2025
OpenGPT-X: Open Source AI 'Made in Germany' falls short of own claims
In this deep dive we evaluate OpenGPT-X's flagship Teuken models through the lens of openness
03 April 2025
Introducing Performance Classes in the OS AI Index
How we classify models under 3 performance classes: Limited, Full and Latest
24 February 2025
Introducing the European Open Source AI Index
In which we introduce the European Open Source AI Index and explain how to follow a moving target
17 February 2025
Luminous: the language model that wasn't
In which we trace the silent demise of a hyped German large language model
25 January 2025
How Open is DeepSeek?
Investigating the open-source status of DeepSeek-R1
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Supported by the Centre for Language Studies and the Dutch Research Council. Website design & development © 2024 by BSTN. This version of the index generated 05 March 2026, website content last updated 21 January 2026.