GPT-5 mini
OpenAI's 2025 cost-efficient model — superseded by GPT-6 Luna
Verdict
Was the default for classification, extraction, and simple chat through early 2026. At $0.25/$2.00 it now costs more than twice what GPT-6 Luna does ($0.10/$0.50) for an older model with a smaller context window. Fine to leave in a pipeline that meets its bar; pick Luna for anything new.
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Previous OpenAI family — Sol/Terra/Luna tiers, superseded by GPT-6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-4oSuperseded
OpenAI 2024 multimodal model — legacy, with retirement dates on Azure