GPT-5.2 Large Language Models Reasoning Models Added on April 13, 2026 Released December 11, 2025, GPT-5.2 addresses enterprise and developer workflows with three specialized variants: Instant (fast responses), VerifiedView tool →
o1 Large Language Models Reasoning Models Added on April 8, 2026 o1 is built around a single insight: some problems need deliberate, multi-step reasoning rather than pattern matching at scale. Before generVerifiedFreemiumView tool →