Unlocking ChatGPT's 1M Context Window: Costs Double After 272K Tokens
eyishazyer · x · 2026-08-17
Developer Tibo released the configuration to unlock the full 1M-token context window in ChatGPT, but highlighted a significant pricing trade-off.
- Pricing Threshold: Once input exceeds 272K tokens, the entire request is billed at 2x for input and 1.5x for output, not just the excess tokens.
- Availability: The feature works through regular ChatGPT accounts as well as API keys.
- Context: Such configurations typically remain undocumented until reverse-engineered, making this disclosure a genuine surprise.
Related event: Codex Users Unlock 1M Token Context for GPT-5.6 Sol with a Config Tweak(12 posts)→
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