Lifecycle, licence, release, pricing and hosting changes to OpenAI GPT family (GPT-5 / GPT-4o / o3 / o4) in the AI Agent Infrastructure Landscape. https://mrpeppersdev.github.io/agent-infrastructure-landscape/feeds/openai-gpt-family-gpt-5-gpt-4o-o3-o4--openai-com.xml 2026-10-28T00:00:00Z AI Agent Infrastructure Landscape https://mrpeppersdev.github.io/agent-infrastructure-landscape/systems/openai-gpt-family-gpt-5-gpt-4o-o3-o4--openai-com#2026-10-28-ba5242f05d 2026-10-28T00:00:00Z

Latest release: “GPT-6 Sol / Luna / Instant in ChatGPT (2026-10-07); API flagship GPT-6 Astra (announced 2026-09-03, staged rollout)” → “GPT-6.1 Terra (2026-10-26; computer use) and GPT-6.1 Sol; earlier GPT-6 Sol / Luna / Instant in ChatGPT (2026-10-07) and API flagship GPT-6 Astra (announced 2026-09-03)”. Source change: https://github.com/MrPeppersDev/agent-infrastructure-landscape/pull/290

https://mrpeppersdev.github.io/agent-infrastructure-landscape/systems/openai-gpt-family-gpt-5-gpt-4o-o3-o4--openai-com#2026-10-26-80cd27834a 2026-10-26T00:00:00Z

License: “not applicable — not OSS” → “proprietary (API only)”. Latest release: “GPT-5 (2025-08), o4-mini, GPT-4.1 series” → “GPT-6 Sol / Luna / Instant in ChatGPT (2026-10-07); API flagship GPT-6 Astra (announced 2026-09-03, staged rollout)”. Pricing: “Pay-per-token API (GPT-5 $1.25/$10 per 1M; GPT-4o $2.50/$10; o3 $2/$8); ChatGPT Free + Plus ($20/mo) + Pro ($200/mo) + Team + Enterprise” → “API flagship GPT-6 Astra $10 input / $50 output per 1M tokens (Fast mode 2x price); ChatGPT Free / Go / Plus / Pro / Business / Enterprise plans”. Deployment: “Managed-only (OpenAI API + Microsoft Azure OpenAI)” → “Managed-only — OpenAI API + ChatGPT, also Microsoft Azure and AWS Bedrock (separate gpt-oss open-weight models exist)”. Source change: https://github.com/MrPeppersDev/agent-infrastructure-landscape/pull/258