Modelpeers

GPT-6 Luna changelog

Every change to GPT-6 Luna that Modelpeers has recorded, newest first, each with the source it came from. The record starts Sep 22, 2026.

All (8)Releases (4)Breaking changes (2)Prices/limits (1)Quality (1)

September 2026

OpenAI Codex characterGPT-6 Luna character

GPT-6 Sol, GPT-6 Luna and OpenAI Codex

3 products from OpenAI

Quality report · Confirmed by the lab

OpenAI fixes an image encoding bug that degraded GPT-6 Sol and Luna image understanding

OpenAI's API changelog says a bug in image encoding degraded image understanding in GPT-6 Sol and GPT-6 Luna, and the fix improves visual tasks in the API and Codex, including computer use.

Who is affected:
Apps and Codex sessions that sent image inputs or used computer use with GPT-6 Sol or GPT-6 Luna after their September 22 release.
What to do:
Rerun evaluations and retry workflows that used image inputs with GPT-6 Sol or GPT-6 Luna.

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