GPT-4 Turbo

GPT-4 Turbo is a multimodal large language model developed by OpenAI, released on November 6, 2023, at its first DevDay conference. It extends the GPT-4 architecture with a 128,000-token context window—roughly 300 pages of text—and knowledge updated to April 2023. OpenAI set aggressive pricing: $0.01 per 1,000 input tokens and $0.03 per 1,000 output tokens, a 3x and 2x reduction respectively versus standard GPT-4. GPT-4 Turbo matters now because it established a cost-performance baseline for frontier models in late 2023, forcing competitors to respond to its combination of extended context, multimodal input, and enterprise-viable pricing. However, its appearance under multiple aliases—including GPT-4, GPT-4-Turbo, and GPT-5 Turbo—in later records, with a 2026 first-seen date, highlights significant opacity in OpenAI’s versioning and naming conventions. This inconsistency complicates enterprise compliance audits, model deprecation timelines, and integration planning, directly impacting organizations that rely on accurate model registries for regulatory and operational reasons.