OpenAI launches GPT‑5.6 family with cheaper, long‑context agents
OpenAI’s GPT‑5.6 family is now generally available in three tiers—Luna ($1/$6), Terra ($2.50/$15) and Sol ($5/$30) per million tokens—with a million‑token context window. Benchmarks show Sol beating Claude Fable 5 on long‑running agentic tasks while costing a quarter as much, and the API adds programmatic tool calling, multi‑agent support, and explicit prompt‑cache breakpoints.