OpenAI Expands GPT-6.1 Sol Default Context to 500K Tokens with Free Long-Context Access and 1M Cap宝玉 (@dotey)T2Tools & Engineering

宝玉 (@dotey) · 10/12/2026, 08:11:48

Codex Default Context Doubles to 500k for GPT-6.1 Sol, Supporting 1M Max Window

By 宝玉 (@dotey)Original title: Codex 默认上下文以前大约是200k到300k之间，现在变成500k了，可以减少压缩频度；最大上下文长度可以到 1M

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Executive Summary

OpenAI increased the default context length for GPT-6.1 Sol in Codex from ~272k to 500k, an ~80% boost aimed at reducing compaction frequency in long-running tasks. The model supports a maximum context window of 1M, allowing users to manually override defaults.

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Codex 默认上下文以前大约是200k到300k之间，现在变成500k了，可以减少压缩频度；最大上下文长度可以到 1M

↳ 引用 @thsottiaux (Tibo): Day 7/

We have increased default context length for GPT-6.1 Sol to 500k when used through Codex & Work, up from 272k or an ~ 80% increase.

We will go higher in the future, but it helps reduce occurrence of compactions and with tasks that require keeping a lot of context and nuance over periods of time. It was carefully tested and is the new sweet spot for most of our users. You can still override it if you want to be higher our lower, with maximum context length of GPT-6.1 Sol of 1M.