Frontier lab releases, open-source checkpoints, multimodal systems, inference stacks, and model capability shifts.
OpenAI ships GPT‑5.6 Sol, Luna & Terra with 1M‑token context
OpenPromptZone reports that OpenAI released the GPT‑5.6 line (Sol, Luna, Terra) on the API with a 1M‑token context window and separate standard/Pro tiers.[2] These models extend GPT‑5.5’s frontier role and are positioned as general reasoning systems with long‑context workflows.[2][8]
Anthropic’s Claude Opus 5 becomes latest frontier release
OpenHarare Tech AI notes that Anthropic shipped Claude Opus 5 on July 24, 2026, making it the most recent frontier model on public trackers and following the earlier Claude Fable 5 and Sonnet 5 launches.[7][2] Prior Anthropic releases in this family introduced 1M‑token context and stepped‑up reasoning performance over Claude Opus 4.x.[11]
Open‑weight frontier surge: Inkling, Hunyuan HY3 and large MoE models
OpenAn AI Horizon weekly briefing highlights several recent open‑weight frontier‑scale releases, including Thinking Machines’ Inkling (975B‑parameter MoE, 41B active) and Tencent’s Hunyuan HY3 (295B‑parameter MoE, 21B active, 256k context, Apache 2.0).[12] These models join earlier open‑weight efforts such as ZAYA1‑8B and GLM‑5 that chase frontier capabilities with self‑hostable licenses.[9][11]
