Compare AI product timelines

Documented releases by product. Dates refer to official events; coverage is curated and may not include the latest version.

Oldest → newest. Columns are event dates; gaps between columns do not represent equal elapsed time. Coverage is curated, not complete.

Product	2026-07-09	2026-07-21	2026-08-13	2026-09-02	2026-09-03	2026-09-22	2026-09-28	2026-09-29	2026-09-30
Anthropic · Claude Sonnet	—	—	—	—	—	—	Claude Sonnet 5.5Release (see availability) Improved everyday coding and knowledge work at lower per-task cost.	—	—
OpenAI · GPT models	GPT-5.6General availability General availability of Sol/Terra/Luna across ChatGPT, Codex and API; gradual rollout over 24 hours.	—	—	—	GPT-6 AstraRelease (see availability) Flagship reasoning and coding; phased rollout beginning with limited organizations, not simultaneous all-plan access.	GPT-6 Sol and LunaRelease (see availability) Additional faster and lower-cost GPT-6 tiers; distinct from Astra and 6.1 Sol.	—	GPT-6.1 SolRelease (see availability) Improved coding/computer use/professional work; ChatGPT Work, Codex and API at launch, not Chat. API changelog confirms date.	—
Google · Gemini models	—	Gemini 3.6 FlashGeneral availability Stable production Flash, better coding/knowledge/multimodal efficiency; Lite/Cyber have separate availability.	Gemini 3.7 FlashGeneral availability GA with improved software engineering, web development and agent workflows.	Gemini 3.8 FlashGeneral availability Gemini API GA with stronger long-horizon coding; Flash Cyber separately restricted to trusted defenders.	—	—	—	—	Gemini 4 ArgonPreview / limited access Restricted rollout to trusted cyber defenders through Fairwind Program; not publicly or generally available.