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GPT-5.6 Sol 1M Context: Codex Unlock Guide

This story is from 2026-09-02. It is preserved in the archive; the latest stories are on the live feed.

GPT‑5.6 Sol natively supports a 1,050,000‑token context window according to official OpenAI documentation. For a long time, Codex artificially capped this capability at 272K tokens for product‑level considerations. On August 17, 2026, OpenAI Codex engineer Tibo Duponchelle released a three‑line con…

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  1. 2026-09-02 09:33 · DEV Community — AI
    GPT-5.6 Sol 1M Context: Codex Unlock Guide

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