Noometry

Alternatives

Best Open-Source the OpenAI API Alternatives in October 2026

The strongest open-weight alternative to the OpenAI API as of October 2026 is Kimi K3 from Moonshot AI: 11.2 points behind GPT-6 Astra, 3.3× cheaper per token; open weights. Compared against GPT-6 Astra, the OpenAI API's current top model.

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  1. Kimi K3 Moonshot AI

    11.2 points behind GPT-6 Astra, 3.3× cheaper per token; open weights.

    Score 59.5, $6 per M tokens blended.Compare with GPT-6 Astra

  2. GLM-5.3 Z.ai (Zhipu)

    15.9 points behind GPT-6 Astra, 9.3× cheaper per token; open weights.

    Score 54.8, $2.15 per M tokens blended.Compare with GPT-6 Astra

  3. DeepSeek V4 Pro DeepSeek

    16.4 points behind GPT-6 Astra, 20.2× cheaper per token; open weights.

    Score 54.3, $0.99 per M tokens blended.Compare with GPT-6 Astra

  4. MiMo-V2.6-Pro Xiaomi

    20.5 points behind GPT-6 Astra, 36.8× cheaper per token; open weights.

    Score 50.3, $0.54 per M tokens blended.Compare with GPT-6 Astra

  5. Inkling-Small Thinking Machines Lab

    24.3 points behind GPT-6 Astra, 31.4× cheaper per token; open weights.

    Score 46.5, $0.64 per M tokens blended.Compare with GPT-6 Astra

  6. Qwen3.5 397B-A17B Alibaba (Qwen)

    24.7 points behind GPT-6 Astra, 14.8× cheaper per token; open weights.

    Score 46.0, $1.35 per M tokens blended.Compare with GPT-6 Astra

  7. Hy4 preview Tencent

    25.5 points behind GPT-6 Astra, 17.8× cheaper per token; open weights.

    Score 45.3, $1.13 per M tokens blended.Compare with GPT-6 Astra

  8. MiniMax-M3 MiniMax

    27.0 points behind GPT-6 Astra, 38.1× cheaper per token; open weights.

    Score 43.8, $0.52 per M tokens blended.Compare with GPT-6 Astra

More: All alternatives, Cheaper, For coding

Frequently asked questions

What is the best alternative to the OpenAI API?

The strongest open-weight alternative to the OpenAI API as of October 2026 is Kimi K3 from Moonshot AI: 11.2 points behind GPT-6 Astra, 3.3× cheaper per token; open weights. Compared against GPT-6 Astra, the OpenAI API's current top model.

How were these alternatives chosen?

Each is the highest-ranked model from a different provider with downloadable weights, compared on the Noometry Index against GPT-6 Astra.