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Models / GPT-6 Luna / Alternatives

GPT-6 Luna alternatives

GPT-6 Luna has no public price, so we cannot compare cost.

The best open-weights alternative is Kimi K3, 26 points higher Overall.

29 models score higher Overall, led by Claude Fable 5.1.

Updated Oct 13, 2026 · Method v1.2 · Higher score, lower price or open weights, best first

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Top 10 of 31 alternatives

  1. Claude Fable 5.1

    Anthropic

    Overall90
    Rank
    #1 Overall
    Best job
    #1 Math
    Price, 1M tokens
    $10 in · $50 out
    Released
    Sep 1, 2026
    Higher score53 points higher Overall
    Compare Claude Fable 5.1 with GPT-6 Luna

  2. Claude Opus 5.5

    Anthropic

    New
    Overall90
    Rank
    #1 Overall
    Best job
    #1 Writing
    Price, 1M tokens
    $4 in · $20 out
    Released
    Sep 22, 2026
    Higher score53 points higher Overall
    Compare Claude Opus 5.5 with GPT-6 Luna

  3. Claude Opus 5

    Anthropic

    Overall88
    Rank
    #3 Overall
    Best job
    #1 Coding
    Price, 1M tokens
    $5 in · $25 out
    Released
    Jul 24, 2026
    Higher score51 points higher Overall
    Compare Claude Opus 5 with GPT-6 Luna

  4. GPT-6 Astra

    OpenAI

    Overall84
    Rank
    #4 Overall
    Best job
    #1 Agents
    Price, 1M tokens
    $10 in · $50 out
    Released
    Sep 3, 2026
    Higher score47 points higher Overall
    Compare GPT-6 Astra with GPT-6 Luna

  5. GPT-6.1 Sol

    OpenAI

    New
    Overall80
    Rank
    #5 Overall
    Best job
    #2 Reasoning
    Price, 1M tokens
    not listed
    Released
    Sep 29, 2026
    Higher score43 points higher Overall
    Compare GPT-6.1 Sol with GPT-6 Luna

  6. Claude Fable 5

    Anthropic

    Overall77
    Rank
    #6 Overall
    Best job
    #2 Coding
    Price, 1M tokens
    $10 in · $50 out
    Released
    Jun 9, 2026
    Higher score40 points higher Overall
    Compare Claude Fable 5 with GPT-6 Luna

  7. GPT-5.6 Sol

    OpenAI

    Overall69
    Rank
    #7 Overall
    Best job
    #5 Agents
    Price, 1M tokens
    $4 in · $20 out
    Released
    Jul 9, 2026
    Higher score32 points higher Overall
    Compare GPT-5.6 Sol with GPT-6 Luna

  8. Gemini 3.8 Flash

    Google DeepMind

    Overall67
    Rank
    #8 Overall
    Best job
    #4 Reasoning
    Price, 1M tokens
    $0.75 in · $3.75 out
    Released
    Sep 2, 2026
    Higher score30 points higher Overall
    Compare Gemini 3.8 Flash with GPT-6 Luna

  9. Gemini 3.7 Flash

    Google DeepMind

    Overall65
    Rank
    #9 Overall
    Best job
    #6 Agents
    Price, 1M tokens
    $0.75 in · $3.75 out
    Released
    Aug 13, 2026
    Higher score28 points higher Overall
    Compare Gemini 3.7 Flash with GPT-6 Luna

  10. Kimi K3

    Moonshot

    Open weights
    Overall63
    Rank
    #10 Overall
    Best job
    #8 Coding
    Price, 1M tokens
    $3 in · $15 out
    Released
    Jul 16, 2026
    Higher scoreOpen weights26 points higher Overall
    Compare Kimi K3 with GPT-6 Luna