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Models / Claude Sonnet 5.5 / Alternatives

Claude Sonnet 5.5 alternatives

Claude Sonnet 5.5 has no public price, so we cannot compare cost.

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

3 models score higher Overall, led by Claude Opus 5.5.

Updated Oct 14, 2026 · Method v1.2 · Higher score, lower price or open weights, best first

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Top 10 of 10 alternatives

  1. Claude Opus 5.5

    Anthropic

    New
    Overall92
    Rank
    #1 Overall
    Best job
    #1 Agents
    Price, 1M tokens
    $4 in · $20 out
    Released
    Sep 22, 2026
    Higher score7 points higher Overall
    Compare Claude Opus 5.5 with Claude Sonnet 5.5

  2. Claude Fable 5.1

    Anthropic

    Overall88
    Rank
    #2 Overall
    Best job
    #1 Math
    Price, 1M tokens
    $10 in · $50 out
    Released
    Sep 1, 2026
    Higher score3 points higher Overall
    Compare Claude Fable 5.1 with Claude Sonnet 5.5

  3. Claude Opus 5

    Anthropic

    Overall87
    Rank
    #3 Overall
    Best job
    #1 Coding
    Price, 1M tokens
    $5 in · $25 out
    Released
    Jul 24, 2026
    Higher score2 points higher Overall
    Compare Claude Opus 5 with Claude Sonnet 5.5

  4. Kimi K3

    Moonshot

    Open weights
    Overall63
    Rank
    #11 Overall
    Best job
    #8 Coding
    Price, 1M tokens
    $3 in · $15 out
    Released
    Jul 16, 2026
    Open weights22 points lower Overall
    Compare Kimi K3 with Claude Sonnet 5.5

  5. DeepSeek V4.1 Flash

    DeepSeek

    Open weights
    Overall51
    Rank
    #21 Overall
    Best job
    #14 Design
    Price, 1M tokens
    not listed
    Released
    Sep 9, 2026
    Open weights34 points lower Overall

  6. GLM-5.3-Flash

    Z.ai (Zhipu AI)

    Open weights
    Overall48
    Rank
    #23 Overall
    Best job
    #16 Coding
    Price, 1M tokens
    $0.15 in · $0.50 out
    Released
    Aug 20, 2026
    Open weights37 points lower Overall

  7. DeepSeek V4 Pro 0813

    DeepSeek

    Open weights
    Overall45
    Rank
    #26 Overall
    Best job
    #22 Design
    Price, 1M tokens
    not listed
    Released
    Aug 13, 2026
    Open weights40 points lower Overall

  8. GLM-5.2

    Z.ai (Zhipu AI)

    Open weights
    Overall40
    Rank
    #31 Overall
    Best job
    #18 Design
    Price, 1M tokens
    $1.40 in · $4.40 out
    Released
    Jun 16, 2026
    Open weights45 points lower Overall

  9. GLM-5.1

    Z.ai (Zhipu AI)

    Open weights
    Overall31
    Rank
    #35 Overall
    Best job
    #29 Writing
    Price, 1M tokens
    $1.40 in · $4.40 out
    Released
    Apr 7, 2026
    Open weights54 points lower Overall

  10. Inkling-Small

    Thinking Machines

    Open weights
    Overall7
    Rank
    #42 Overall
    Best job
    #46 Reasoning
    Price, 1M tokens
    not listed
    Released
    Jul 15, 2026
    Open weights78 points lower Overall