AI · alternatives · 2026
24 alternatives to OpenAI o3 and o4-mini
Advanced Visual Reasoning & Agentic Tool Use
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1
OpenAI o3-mini▲510Pushing the frontier of cost-effective reasoning
2025 · openai.com · its alternatives →
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Open AI o3 API▲141Advanced reasoning models with safety-first innovation.
2024 · openai.com · its alternatives →
- 4
OpenAI o1 API ▲458OpenAI's most advanced model, o1 API to third-party devs
2024 · developers.openai.com · its alternatives →
- 5
GPT-4▲1,160More accurate, less cringe, smoother & useful daily chats!
2023 · openai.com · its alternatives →
- 6
gpt-oss-120b and gpt-oss-20b open-weight language models
2025 · openai.com · its alternatives →
- 7
Open-weight 15B multimodal model for thinking and GUI agents
Mar 2026 · microsoft.com · its alternatives →
- 8
DeepSeek-V3.1▲417The best-performing and best of value open-source AI model
2025 · chat.deepseek.com · its alternatives →
- 9
Qwen3.5▲288The 397B native multimodal agent with 17B active params
Feb 2026 · qwen.ai · its alternatives →
- 10
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Hey everyone, We have been building SecureAI Tools -- an open-source application layer for ChatGPT and ChatPDF-like AI tools. It works with locally running LLMs as well as with OpenAI-compatible APIs. For local LLMs, it supports Ollama which supports all the gguf/ggml models. Currently, it has two features: Chat-with-LLM, and Chat-with-PDFs. It is optimized for self-hosting use cases and comes with basic user management features. Here are some quick demos: * Chat with documents using OpenAI's GPT3.5 model: https://www.youtube.com/watch?v=Br2D3G9O47s * Chat with documents…
2023 · github.com · its alternatives →
- 12
DeepSeek-V3.2▲198Reasoning-first models built for agents
Dec 2025 · huggingface.co · its alternatives →
- 13
Agno▲326Build, run, and manage agent platforms. Contribute to agno-agi/agno development by creating an account on GitHub.
2025 · github.com · its alternatives →
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DeepSeek-V4▲387The open-source era of 1M context intelligence
Apr 2026 · huggingface.co · its alternatives →
- 17
Llama 4▲422A new era of natively multimodal AI innovation
2025 · developer.meta.com · its alternatives →
- 18
O3 alternative
2025 · sota-ai.nfshost.com · its alternatives →
- 19
Fast and efficient models optimized for coding and subagents
Mar 2026 · openai.com · its alternatives →
- 20
Announcing GPT-4.1, GPT-4.1 mini, & GPT-4.1 nano in the API
2025 · openai.com · its alternatives →
- 21WA
Hey HN, I didn't want my Gateway 4DX2-66 from 1993 to be left out of the AI revolution, so I built an AI Assistant for Windows 3.1, based on the OpenAI API. The most interesting parts of building this were: - Getting TLS 1.2 and 1.3 working on Windows 3.1 so that WinGPT could directly connect to OpenAI's server without relying on a modern machine for TLS termination. - Learning about the memory segmentation architecture on 16-bit Windows, including the difference between far and near pointers. - Building the UI in plain C code with the Windows API and limited selection of controls in Windows…
2023 · dialup.net · its alternatives →
- 22OS
Complete AI Platform: RAG Systems & Intelligent Agents for Local AI
2025 · rlama.dev · its alternatives →
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OpenAI most advanced image generator yet
2025 · openai.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →