Software.
GPT-5.6 reached full GA as a three-tier family — Sol $5/$30, Terra $2.50/$15, Luna $1/$6 per MTok — after a 12-day government-coordinated preview; GPT-5.4 retires Jul 23
OpenAI; Vellum benchmark analysis
xAI released Grok 4.5, an 'Opus-class' workhorse at $2/$6 per MTok co-trained with Cursor — 4th on the AA Intelligence Index, claiming ~4.2x fewer output tokens per SWE-Bench Pro task; not available in the EU at launch
xAI; TechCrunch
Tencent released Hy3 (295B MoE, 21B active) under clean Apache 2.0 at ~$0.20/$0.80 per MTok — and the community made it locally deployable in ~30 hours, with llama.cpp MTP speculative decoding measuring +40% throughput
Hugging Face model card; Simon Willison; llama.cpp PR #25395
Meta released Muse Spark 1.1 and opened the Meta Model API in public preview — the first frontier Meta model distributed through a first-party API rather than open weights or Meta's own apps
Meta AI
Gemini 3.5 Pro slipped again to a reported July 17 target after Google rebuilt the base model; the public API still lists no 3.5 Pro model ID
TechTimes; Google Gemini API model list
What this means
Four frontier-relevant releases in four days, and every closed launch priced against the open floor: Terra at half GPT-5.5's rate and Grok 4.5 at $2/$6 are responses to Apache-2.0 Hy3 economics and GLM 5.2's per-task parity. Architects should lock inference pricing during this window and re-benchmark at the task level — see the Model Pulse for the full architecture read, including why the harness now matters more than the rate card.