OpenAI raises default context window for GPT-6.1 Sol to 500,000 tokens

OpenAI has expanded the default context length for GPT-6.1 Sol in Codex and ChatGPT Work from 272,000 tokens to 500,000 tokens, an 80-percent increase that aims to reduce information loss in long-context tasks. The upgrade, announced October 12 by Tibo Sottiaux, head of OpenAI Codex, comes less than two weeks after GPT-6.1 Sol's general release on September 29, 2026. While the new 500,000-token default represents a substantial boost for most workflows, it falls short of the model's full 1.05-million-token capacity, which users can manually configure if needed.