Mellum-4b-base is JetBrains' first open-source large language model (LLM) optimized for code-related tasks.
Czechia
EU
OpenAI Codex AlternativesOnly apps categorised as Large Language Model (LLM) Tools
The best Large Language Model (LLM) alternative to OpenAI Codex is Mellum, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to OpenAI Codex and seven of them are Large Language Model (LLM) Tools so hopefully you can find a suitable replacement. Other interesting Large Language Model (LLM) Tool alternatives to OpenAI Codex are Rivet AI, Osaurus, OpenPrompt and Dify - LLMOps Platform.
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OpenAI Codex alternatives are mainly AI Coding Assistants, but if you're looking for Large Language Model (LLM) Tools you can filter on that. Other popular filters include Open Source. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to OpenAI Codex.
Alternatives list
91 Rivet AI alternativesVisual AI programming platform with a graphical interface for creating, editing, and debugging LLM agent workflows, supporting real-time collaboration, YAML-based version control, open-source TypeScript library integration, and scalable deployment in production environments.
49 Osaurus alternativesAI edge infrastructure for macOS. Run local or cloud models, share tools across apps via MCP, and power AI workflows with a native, always-on runtime.
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Cost / License
- Free
- Open Source (MIT)
Platforms
- Mac
- Windows
- Linux
Streamlines AI application development by combining plugin and dataset integration, a unified API, visual orchestration, analytics, annotation tools, prompt engineering support, backend-as-a-service capabilities, and compatibility with multiple modern LLMs.
Cost / License
- Freemium
- Open Source
Application type
Platforms
- Online
- Self-Hosted
- Cloudron
+5
25 Pieces for Developers alternativesYour Personalized AI Development Assistant and Workflow Copilot.
Cost / License
- Free
- Proprietary
Application type
Platforms
- Mac
- Windows
- Linux
- Microsoft Edge
- Google Chrome
- Visual Studio Code
- Microsoft Teams
- Firefox
+1
A new family of code large language models (LLMs) designed to advance autonomous software engineering and code intelligence.
Cost / License
- Free
- Open Source (MIT)
Platforms
- Self-Hosted
- Python
United States
