GPT-5.6 Sol Terra Luna: Critical Chain Update July 2026
GPT-5.6 Sol is now generally available — and its three-tier pricing structure changes the fallback chain more decisively than any single model release this month has. OpenAI released the GPT-5.6 family on July 9, 2026, following a limited preview that began June 26. All three tiers are now in the API: Sol at $5 per … Read more