GPT-4o mini
OpenAI's 2024 cost-efficient model — superseded by GPT-6 Luna
Verdict
GPT-6 Luna is cheaper ($0.10/$0.50 against $0.15/$0.60), far more capable, and has roughly eight times the context window, so there is no remaining reason to pick this for a new build. Azure lists it as deprecated with an April 2027 retirement. Migrate when you next touch the pipeline.
Other Text Generation & Reasoning
- GPT-6 AstraProduction
OpenAI's most capable model — 1.05M context, 128K output
- GPT-6.1 SolProduction
The OpenAI default — near-Astra quality at a fifth of the price
- GPT-6 LunaProduction
OpenAI's efficient tier — $0.10/$0.50 with the full 1.05M context
- GPT-5.6Superseded
Previous OpenAI family — Sol/Terra/Luna tiers, superseded by GPT-6
- GPT-5Superseded
OpenAI's 2025 flagship — two families back now
- GPT-5 miniSuperseded
OpenAI's 2025 cost-efficient model — superseded by GPT-6 Luna