# Open-source AI models

A guide to notable open-weight AI models, spanning flagship large language models, small efficient models, and enterprise-focused releases, grouped by scale and focus.

Canonical URL: https://globalaiproductindex.com/guides/best-open-source-ai-models/

## Flagship open-weight LLMs

- [Llama](https://globalaiproductindex.com/products/llama/) (Meta) — Open Models, Open (open weights/source), launched 2023-02. Open-weight large language model family from Meta, spanning Llama 3 and Llama 4 generations across multiple sizes.
- [Mistral](https://globalaiproductindex.com/products/mistral/) (Mistral AI) — Open Models, Open (open weights/source), launched 2023-09. Family of open-weight large language models from Mistral AI, including the Mistral and Mixtral series.
- [Qwen](https://globalaiproductindex.com/products/qwen/) (Alibaba) — Open Models, Open (open weights/source), launched 2023-08. Family of open-weight large language models developed by Alibaba, spanning text, vision, and coding tasks, including the Qwen3.5 and Qwen3.8-Max lines.
- [DeepSeek](https://globalaiproductindex.com/products/deepseek/) (DeepSeek) — Open Models, Open (open weights/source), launched 2023-11. Open-weight LLM family and chat assistant from Hangzhou-based DeepSeek, known for strong reasoning models. The official DeepSeek-V4-Flash-0731 API brings a major agent-capability upgrade via post-training, with native Responses API support and Codex adaptation.
- [GLM](https://globalaiproductindex.com/products/glm/) (Z.ai (Zhipu AI)) — Open Models, Open (open weights/source), launched 2023. Family of open-weight large language models from Zhipu AI, spanning general, reasoning, and coding-focused variants.

## Small and efficient models

- [Gemma](https://globalaiproductindex.com/products/gemma/) (Google DeepMind) — Open Models, Open (open weights/source), launched 2024-02. Google's family of lightweight open-weight models derived from the same research as Gemini.
- [Phi](https://globalaiproductindex.com/products/phi/) (Microsoft) — Open Models, Open (open weights/source), launched 2023. Family of small open-weight language models from Microsoft, designed for strong reasoning at compact sizes.
- [OLMo](https://globalaiproductindex.com/products/olmo/) (Allen Institute for AI) — Open Models, Open (open weights/source), launched 2024-02. Fully open large language model family from Ai2, released with its training data, code, and weights.

## Enterprise-focused models

- [Command R](https://globalaiproductindex.com/products/command-r/) (Cohere) — Open Models, Open (open weights/source), launched 2024-03. Cohere's open-weight LLM family optimized for retrieval-augmented generation and tool use; succeeded by Command A as Cohere's flagship.
- [Granite](https://globalaiproductindex.com/products/granite/) (IBM) — Open Models, Open (open weights/source), launched 2023-09. IBM's family of open-weight language models aimed at enterprise and code tasks.
- [Nemotron](https://globalaiproductindex.com/products/nemotron/) (NVIDIA) — Open Models, Open (open weights/source), launched 2024. Family of open language models released by NVIDIA for enterprise and research use.
- [Jamba](https://globalaiproductindex.com/products/jamba/) (AI21 Labs) — Open Models, Open (open weights/source), launched 2024-03. Open model family from AI21 Labs that combines Transformer and state-space (Mamba) architectures.

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Data from the [Global AI Product Index](https://globalaiproductindex.com/), licensed CC BY 4.0.