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AI · alternatives · 2026

24 alternatives to GPT-6 Sol & Luna

Frontier AI intelligence, now at half the price

GPT-6 Sol & Luna are faster, cheaper AI models from OpenAI trained using methods similar to their Astra model. They offer 50% lower API pricing than previous versions, with comparable performance in factuality, coding… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

  1. 1IR
  2. 2

    Scaled access to research-grade intelligence

    2024 · openai.com · its alternatives →

  3. 3

    Fast and efficient models optimized for coding and subagents

    Mar 2026 · openai.com · its alternatives →

  4. 4

    The easiest way to access frontier AI models.

    Aug 2026 · tokenharbor.ai · its alternatives →

  5. 5

    One unified API for all AI models like Gemini, GPT-4, DALL-E

    2023 · getmerlin.in · its alternatives →

  6. 6

    Frontier reasoning in the terminal

    2025 · github.com · its alternatives →

  7. 7

    Tighter instruction adherence in speech agents

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

  8. 8

    Hey HN — I'm Parth, I built thisorthis.ai because I was tired of copy-pasting the same prompt across ChatGPT, Claude, and Gemini tabs to figure out which model actually gave the best answer. What it does: You type one prompt, pick 2–6 models (we support 47 text models and several image models across OpenAI, Anthropic, Google, xAI, Meta, Amazon, Mistral, Cohere, AI21), and see every response side-by-side. There's also a feature called SmartPick that uses an LLM evaluator to score each response on Clarity, Accuracy, Completeness, and Helpfulness — useful when you're comparing 6 models and…

    2024 · thisorthis.ai · its alternatives →

  9. 9

    Cut your Claude and GPT API costs by up to 96%

    Jul 2026 · cheap-ai-apis.carrd.co · its alternatives →

  10. 10

    Access ChatGPT, Claude, Gemini, Grok, and more in one place

    2025 · duple.ai · its alternatives →

  11. 11NG
  12. 12
    Zeplik▲5

    Every AI model, one chat. GPT, Claude, Gemini, Grok

    Jul 2026 · zeplik.ai · its alternatives →

  13. 13

    The best generative AI text, image, video, and audio

    2025 · gptproto.com · its alternatives →

  14. 14

    Automate customer support with AI trained on your data

    2024 · aleksandar.ws · its alternatives →

  15. 15

    You can talk to GPT, Gemini, Grok, Claude in one place!

    Dec 2025 · parallax.kr · its alternatives →

  16. 16

    OpenAI-compatible GPT-5.6 Sol with High reasoning mode

    Sep 2026 · rapidapi.com · its alternatives →

  17. 17

    One OpenAI-compatible API for GPT, Claude, Gemini, Flux, Kling and 100+ models. Compare pricing, switch instantly, pay per token.

    Jul 2026 · velokey.ai · its alternatives →

  18. 18

    One API for GPT, Claude, Gemini & every major AI model

    May 2026 · apilink.io · its alternatives →

  19. 19

    Gemini 1.5 Pro vs ChatGPT-4o: benchmark performance and pricing. Test both via AIMLAPI alongside 1000+ models.

    2024 · aimlapi.com · its alternatives →

  20. 20DA

    Better AI interface for any model. Use OpenAI, Anthropic Claude, Google Gemini, Grok, Mistral, and Llama in one fast, beautiful UI with search, tools, agents, and file uploads.

    2023 · dappergpt.com · its alternatives →

  21. 21IM

    Hi guys, For my startup at www.mithrin.ai which is about create AI Chatbot Agents for websites, I wanted to create some free tools to attract traffic to the site and decided to create specialized chatbots powered by LLMs, similar to OpenAI's Custom GPTs. I realized that by using gpt-4o-mini, I could create quite powerful alternatives to GPTs that are free to the public for a very small cost (given how cheap the model api cost is). I've employed some throttling to prevent abuse and to avoid being charged too much. Then I integrated this with my main service and allowed users to use the…

    2024 · mithrin.ai · its alternatives →

  22. 22

    Unlock premier AI models just with $5 (Pay per use)

    2025 · gen-ai-studio.com · its alternatives →

  23. 23

    The Netflix of AI: All the best AI models in one place

    2024 · apps.apple.com · its alternatives →

  24. 24

    Six AI providers. One workspace. Your data never leaves.

    Jan 2026 · callgpt.co.uk · 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 →