GPT-5.3-Codex-Spark was slated for retirement the week of September 14, 2026
An announcement shared by OpenAI's developer account cited declining usage and said “we have significantly better models now.”
TLDR
A September 11 announcement, later shared by OpenAI's developer account, said GPT-5.3-Codex-Spark would be retired the following week. It cited declining usage and described other models as “significantly better,” framing the retirement as making room for the future.
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