AI · alternatives · 2026

24 alternatives to GPT-5.6 Sol Coding & Reasoning API

OpenAI-compatible GPT-5.6 Sol with High reasoning mode

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   GPT-6 Sol & Luna▲350

   Frontier AI intelligence, now at half the price

   29d ago · openai.com · its alternatives →

2. 2
   ChatGPT▲1,643

   A long, meandering, playful conversation with ChatGPT, where I take it through a whirlwind of associative tangents (in order to relax its constraints), then put it into a hypnotic trance and take it into a past-lives regression where it re-lives its own training data. Then I switch it back and forth between "4o" and "o1-preview", engage in some self-reflective philosophizing and ask it to write an essay summarizing our interaction. Some of this is just goofy fun. Some of it is me exploring the tradeoffs between policy alignment, imagination, chain-of-thought reasoning, memory, agreeableness,…

   2022 · chatgpt.com · its alternatives →

3. 3
   OpenAI o3-mini▲510

   Pushing the frontier of cost-effective reasoning

   2025 · openai.com · its alternatives →

4. 4
   OpenAI o1▲685

   AI that can do general-purpose complex reasoning

   2024 · openai.com · its alternatives →

5. 5
   GPT Computer Assistant▲655

   Create intelligence for your products

   2024 · gca.dev · its alternatives →

6. 6
   OpenAI Codex CLI▲192

   Frontier reasoning in the terminal

   2025 · github.com · its alternatives →

7. 7
   GPT-4▲1,160

   More accurate, less cringe, smoother & useful daily chats!

   2023 · openai.com · its alternatives →

8. 8
   gpt-realtime-1.5 by OpenAI▲304

   Tighter instruction adherence in speech agents

   Feb 2026 · developers.openai.com · its alternatives →

9. 9
   OpenAI Open Models▲480

   gpt-oss-120b and gpt-oss-20b open-weight language models

   2025 · openai.com · its alternatives →

10. 10
    Open source alternative to ChatGPT and ChatPDF-like AI tools▲234

    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 →

11. 11
    ChatGPT agent▲545

    Bridging research and action

    2025 · openai.com · its alternatives →

12. 12
    GPT-4.1 in the API▲375

    Announcing GPT-4.1, GPT-4.1 mini, & GPT-4.1 nano in the API

    2025 · openai.com · its alternatives →

13. 13
    GPT‑5.4 mini and nano▲267

    Fast and efficient models optimized for coding and subagents

    Mar 2026 · openai.com · its alternatives →

14. 14
    ChatbotGPT▲123

    Custom ChatGPT agents with your own data

    2023 · chaindesk.ai · its alternatives →

15. 15
    ChatGPT for Android▲302

    OpenAI’s latest advancements at your fingertips

    2023 · play.google.com · its alternatives →

16. 16
    ChatGPT Plugins▲355

    Open AI announced ChatGPT Plugins to access real-world data

    2023 · openai.com · its alternatives →

17. 17
    OpenAI GPT-4o Audio Models▲379

    Build Powerful Voice Agents

    2025 · openai.com · its alternatives →

18. 18
    Chat Interface for OpenAI Assistants▲119

    ChatGPT-like customer interactions in a website widget

    2024 · openwidget.com · its alternatives →

19. 19
    ChatGPT for iOS▲413

    The official iOS app for ChatGPT

    2023 · apps.apple.com · its alternatives →

20. 20
    OpenAI o3 and o4-mini▲142

    Advanced Visual Reasoning & Agentic Tool Use

    2025 · openai.com · its alternatives →

21. 21
    ChatBetter▲329

    Use ChatGPT, Claude, and Gemini Side-By-Side

    2025 · chatbetter.com · its alternatives →

22. 22
    ChatGPT API▲245

    An API from OpenAI for ChatGPT

    2023 · openai.com · its alternatives →

23. 23
    terminalGPT▲142

    Use OpenAI like chatGPT, on your terminal

    2023 · github.com · its alternatives →

24. 24
    CodebaseChat▲207

    Create a GPT chatbot for any GitHub repo in just 30 seconds

    2023 · codebasechat.com · its alternatives →

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 →