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GPT-5.5 Pro vs Kimi K2.7 Code

Verdict

GPT-5.5 Pro leads 7–0 across 7 shared benchmarks.

GPT-5.5 Pro 7 · Kimi K2.7 Code 0 · higher isn't always better — see caveats.

Per-benchmark head-to-head

Reported scores — protocols may differ. How we compare

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GPT-5.5 ProKimi K2.7 Code

Capabilities

Math

Math: GPT-5.5 Pro leads 2–0 across 2 shared math benchmarks (largest gap: FrontierMath-Tier-4-v2-Private, 78.05 vs 12.2 — single evaluator).

4 reproduced

Reasoning

Reasoning: GPT-5.5 Pro leads 2–0 across 2 shared reasoning benchmarks (largest gap: SimpleQA Verified, 64.5 vs 39.2 — single evaluator).

4 reproduced

What the labs claim

Vendor claims — compare against the measured scores above. A claim is what a developer says about its own model, not an independent measurement.

GPT-5.5 Pro

General

  • “In GPT-5.5 Pro, early testers are seeing a significant step up in both the difficulty and quality of work ChatGPT can take on”
    openai.com2026

Reasoning

  • “GPT-5.5 Pro, designed for even harder questions and higher-accuracy work, is available to Pro, Business, and Enterprise users.”
    openai.com2026

Writing

  • “testers found GPT-5.5 Pro's responses significantly more comprehensive, well-structured, accurate, relevant, and useful”
    openai.com2026

Kimi K2.7 Code

No vendor claims on file for Kimi K2.7 Code.

A higher number is not always a better model. Each score is task performance under a disclosed harness. Of the 14 measurements across 7 shared benchmarks, 14 single-evaluator or undisclosed-protocol reports; 86% are independently reproduced. Kimi K2.7 Code pricing is cross-check disputed — weigh cost claims with the same caution as benchmark wins. Follow any benchmark to its integrity grade before reading a win as decisive.

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These models

Same tier

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