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Tax Agent Bench

Independent testVals AI · updated Oct 7, 2026

What it measures

Research-grade U.S. corporate tax questions answered with cited authority.

How to read it

A narrow, high-precision domain that punishes confident guessing.

Open at Vals AI
Best
77.6%
Claude Fable 5.1
Median
63.3%
GPT-6 Astra

Results

26 of 41 tracked models have a result.

Filter in explorer
  1. 1
    Claude Fable 5.1

    Anthropic · Max effort

    77.6%
  2. 2
    Gemini 4 ArgonLimited

    Google DeepMind · High effort

    76.2%
  3. 3
    Claude Sonnet 5.5

    Anthropic · Max effort

    73.4%
  4. 4
    GLM-5.3Open

    Z.ai · Max effort

    73.1%
  5. 5
    Muse Spark 1.3

    Meta · Max effort

    72.4%
  6. 6
    Claude Opus 5.5

    Anthropic · Max effort

    70.5%
  7. 7
    Kimi K3Open

    Moonshot AI · Max effort

    68.7%
  8. 8
    Gemini 3.8 Flash

    Google DeepMind · High effort

    66.8%
  9. 9
    Qwen3.8-Max

    Alibaba

    66.0%
  10. 10
    Grok 4.7

    SpaceXAI · xHigh effort

    65.6%
  11. 11
    GPT-5.6 Terra

    OpenAI · Max effort

    65.2%
  12. 12
    MiMo-V2.6-ProOpen

    Xiaomi

    64.9%
  13. 13
    Hy4 previewOpen

    Tencent

    63.7%
  14. 14
    GPT-6 Astra

    OpenAI · Max effort

    63.3%
  15. 15
    Mistral Large 4

    Mistral AI · High effort

    63.3%
  16. 16
    DeepSeek V4.1 FlashOpen

    DeepSeek · High effort

    62.5%
  17. 17
    GPT-6.1 Sol

    OpenAI · Max effort

    62.3%
  18. 18
    Claude Haiku 5.5

    Anthropic · Max effort

    62.2%
  19. 19
    MiMo-V2.6-FlashOpen

    Xiaomi

    59.9%
  20. 20
    Step 5 Preview

    StepFun

    59.5%
  21. 21
    GPT-6 Luna

    OpenAI · Max effort

    58.9%
  22. 22
    DeepSeek V4 ProOpen

    DeepSeek · Max effort

    58.7%
  23. 23
    MiniMax-M3Open

    MiniMax

    49.7%
  24. 24
    TM
    InklingOpen

    Thinking Machines Lab

    43.5%
  25. 25
    TM
    Inkling-SmallOpen

    Thinking Machines Lab

    41.5%
  26. 26
    Gemini 3.1 Pro

    Google DeepMind · High effort

    37.8%
15 tracked models without a result

Command A+, Gemini 3.5 Flash-Lite, Gemma 4 31B, GLM-5.3-Flash, gpt-oss-120b, Hy3, Kimi K2.7 Code, MAI-Thinking-1, Mistral Medium 3.5, Mistral Small 4, Muse Glimmer 30B, Nemotron 3 Ultra, Nova 2 Lite, Qwen3.8-27B, Qwen3.8-Flash.

Missing means the evaluator has not published a run, not that the model would score poorly.

Model Index

An independent snapshot of frontier SI models and how they perform on third-party benchmarks.

Data as of Oct 8, 2026

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Sources

Benchmark results come from Artificial Analysis, Arena, Vals AI and ARC Prize. Specifications and prices come from each lab's own documentation.

Not affiliated with any lab or evaluator. Names and logos are trademarks of their respective owners and are used only to identify them. Scores change often — check the linked source before making a decision that depends on one.

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