OpenAI Restores 272K Context Windows to GPT-5.6 Sol, Terra and Luna in Codex After a Regression

OpenAI release notes via Releasebot·medium signal

OpenAI's July 18 release notes bundle Codex fixes that restore the full 272,000-token context window across GPT-5.6 Sol, Terra, and Luna — meaning the window had been silently degraded for some period beforehand. Anyone who benchmarked those models in Codex over the past weeks and found long-context performance underwhelming may have been measuring a truncated window rather than the model.