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GPT-6 Astra alternatives

The best cheaper alternative to GPT-6 Astra is Claude Opus 5: 3 points higher Overall, for 50% less per output token.

The best open-weights alternative is Kimi K3, 22 points lower Overall.

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

Updated Sep 28, 2026 · Method v1.1 · Higher score, lower price or open weights, best first

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Top 10 of 30 alternatives

  1. Claude Fable 5.1

    Anthropic

    New
    Overall90
    Rank
    #1 Overall
    Best job
    #1 Math
    Price, 1M tokens
    $10 in · $50 out
    Released
    Sep 1, 2026
    Higher score5 points higher Overall · the same output price
    Compare Claude Fable 5.1 with GPT-6 Astra

  2. Claude Opus 5

    Anthropic

    Overall88
    Rank
    #2 Overall
    Best job
    #1 Coding
    Price, 1M tokens
    $5 in · $25 out
    Released
    Jul 24, 2026
    Higher scoreCheaper3 points higher Overall · 50% less per output token
    Compare Claude Opus 5 with GPT-6 Astra

  3. GPT-5.6 Sol

    OpenAI

    Overall69
    Rank
    #5 Overall
    Best job
    #5 Agents
    Price, 1M tokens
    $4 in · $20 out
    Released
    Jul 9, 2026
    Cheaper16 points lower Overall · 60% less per output token
    Compare GPT-5.6 Sol with GPT-6 Astra

  4. Gemini 3.8 Flash

    Google DeepMind

    New
    Overall67
    Rank
    #6 Overall
    Best job
    #3 Reasoning
    Price, 1M tokens
    $0.75 in · $3.75 out
    Released
    Sep 2, 2026
    Cheaper18 points lower Overall · 93% less per output token
    Compare Gemini 3.8 Flash with GPT-6 Astra

  5. Gemini 3.7 Flash

    Google DeepMind

    Overall66
    Rank
    #7 Overall
    Best job
    #4 Reasoning
    Price, 1M tokens
    $0.75 in · $3.75 out
    Released
    Aug 13, 2026
    Cheaper19 points lower Overall · 93% less per output token
    Compare Gemini 3.7 Flash with GPT-6 Astra

  6. Kimi K3

    Moonshot

    Open weights
    Overall63
    Rank
    #8 Overall
    Best job
    #7 Coding
    Price, 1M tokens
    $3 in · $15 out
    Released
    Jul 16, 2026
    CheaperOpen weights22 points lower Overall · 70% less per output token
    Compare Kimi K3 with GPT-6 Astra

  7. Claude Opus 4.6

    Anthropic

    Overall59
    Rank
    #9 Overall
    Best job
    #2 Writing
    Price, 1M tokens
    $5 in · $25 out
    Released
    Feb 5, 2026
    Cheaper26 points lower Overall · 50% less per output token
    Compare Claude Opus 4.6 with GPT-6 Astra

  8. GPT-5.5

    OpenAI

    Overall59
    Rank
    #9 Overall
    Best job
    #5 Coding
    Price, 1M tokens
    $5 in · $30 out
    Released
    Apr 23, 2026
    Cheaper26 points lower Overall · 40% less per output token
    Compare GPT-5.5 with GPT-6 Astra

  9. Claude Opus 4.7

    Anthropic

    Overall57
    Rank
    #11 Overall
    Best job
    #3 Coding
    Price, 1M tokens
    $5 in · $25 out
    Released
    Apr 16, 2026
    Cheaper28 points lower Overall · 50% less per output token
    Compare Claude Opus 4.7 with GPT-6 Astra

  10. GLM-5.3

    Z.ai (Zhipu AI)

    Overall57
    Rank
    #11 Overall
    Best job
    #11 Coding
    Price, 1M tokens
    $1.40 in · $4.40 out
    Released
    Aug 14, 2026
    Cheaper28 points lower Overall · 91% less per output token
    Compare GLM-5.3 with GPT-6 Astra