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GROMM: Generative Risk-neutral Option Market Models

Magnus Wiese, Hans Buehler, Blanka N. Horvath · 2026 · arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.16732 · cited by 0 works (OpenAlex) · open-access PDF

Indonesian

Kami menyajikan model pasar opsi Eropa yang statis dan dinamis tanpa arbitrase dengan interpolasi yang lancar antara harga opsi, berdasarkan kerangka kerja SANOS, dan membuktikan bahwa dinamiknya mengakui solusi yang kuat yang unik. Dalam semangat, itu adalah model stochastic untuk volatilitas lokal ketika yang terakhir digunakan sebagai representasi dari permukaan harga opsi Eropa, bukan sebagai model penetapan harga. Kami menggambarkan kekuatan pendekatan kami pada data S&P Index Option dari Januari 2022 hingga Agustus 2025. Kami menunjukkan bahwa kondisi awal model sesuai dengan bid/ask untuk lebih dari 95% dari harga opsi pasar yang relevan. Kami kemudian melatih dinamika model di bawah $\mathbb{P}$ dan $\mathbb{Q$ dan menunjukkan bahwa model ini benar-benar bebas dari arbitrase sementara sesuai dengan dinamika pasar dengan baik. Kami juga mengusulkan serangkaian tes BHW untuk meng

Machine translation (Meta M2M100); the English original follows.

Abstract

We present a statically and dynamically arbitrage-free European option market model with smooth interpolation between option prices, based on the SANOS framework, and prove that its dynamics admit a unique strong solution. In spirit, it is a stochastic model for local volatility when the latter is used as a representation of a European option price surface, not as a pricing model. We illustrate the strength of our approach on S&P Index Option data from January 2022 to August 2025. We show that the model's initial state fits within bid/ask for more than 95% of relevant market option prices. We then train the model dynamics under $\mathbb{P}$ and $\mathbb{Q}$ and show that the model is indeed free of arbitrage while fitting the dynamics of the market well. We also propose a range of BHW-tests to test for absence of arbitrage.

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Topics: Valuation of options, Econometrics, Call option, Economics, Implied volatility, Arbitrage

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