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Source Reddit r/ChatGPT reddit.com Forum
August 5, 2026 ai_technology community

Why does ChatGPT still use 5.5 Instant as the main chat model?

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Overview

According to the Artificial Intelligence benchmark, GPT-5.6 Luna Low is like 40 times cheaper and scores a 33 compared to 5.5 instant's 29. Even the non-reasoning version of GPT-5.6 Terra is 5 times cheaper with a score of 34. Why does ChatGPT keep using it as the main chat model? (not talking about codex) submitted by /u/RacketyTerror [link] [comments]

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