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OpenAI
GPT-5.5 family
3 releases · Elo progression and succession lineage (D9)
Elo progression
Apr 2026
GPT-5.5
CLOSED
—
2634.5
Apr 2026
GPT-5.5 (High)
CLOSED
—
2560.2
Apr 2026
GPT-5.5 (xHigh)
CLOSED
—
2677.5