GPT-5.5 Pro
Proprietary
GPT-5.5's deep-reasoning tier: passes Gödel-style tests and has cracked open math conjectures. API-only premium model; included strictly as a frontier comparison anchor.
Provider
OpenAI
Parameters
Unknown
Context
400K
Released
2026-05-06
Benchmark Scores
mmlu93%
humaneval94.5%
Scores are approximate and may vary by quantization level.