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tensor.news grades benchmarks and tags model claims by evidence status. Every fact carries a source record and provenance. Scores are framed as task performance under a disclosed harness, never as deployed capability.

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GPT-5.1 vs GPT-5.5

Verdict

GPT-5.5 leads 15–0 across 15 shared benchmarks.

GPT-5.1 0 · GPT-5.5 15 · higher isn't always better — see caveats.

Per-benchmark head-to-head

GPT-5.1GPT-5.5
  • 17.5
    APEX-Agents
    38.4
  • 72.8
    ARC-AGI
    95
  • 17.64
    ARC-AGI-2
    85
  • 32
    Chess Puzzles
    54
  • 17.3
    CL-bench Life
    22.2
  • 4.86
    CritPt
    27.14
  • 42.79
    DeepResearch Bench
    54.01
  • 83.5
    GPQA diamond
    92
  • 13.73
    GSO-Bench
    40.2
  • 88.6
    OTIS Mock AIME 2024-2025
    100
  • 43.84
    SimpleBench
    62.8
  • 48.9
    SimpleQA Verified
    63.1
  • 67.98
    SWE-Bench verified
    80.58
  • 47.6
    Terminal Bench
    84.7
  • 60.77
    WeirdML
    84.91
A higher number is not always a better model. Each score is task performance under a disclosed harness, and some of these benchmarks are saturated or scored under mixed harnesses. Follow any benchmark to its integrity grade before reading a win as decisive.

Follow the record

These models

  • GPT-5.188.6
  • GPT-5.5100

GPT-5.5 vs …

  • vs PowerMoE-3b
  • vs Claude Fable 5
  • vs Gemini 3.1 Pro
  • vs Llama 3.1-405B
  • vs phi-3-small 7.4B