September timeline: TypeSafe AI exits stealth with Jev, WebMCP task solved at ~112x lower cost
A day-by-day list of September model releases and events, including TypeSafe AI exiting stealth on Sep 15 with Jev, its first System One model, and Jev plus Mercury 2.5 solving a WebMCP task at roughly 112x lower cost on Sep 18.
September Situation Analysis: Sep 1: > Anthropic ships Claude Fable 5.1 and Mythos 5.1 Sep 2: > Google ships Gemini 3.8 Flash and Fairwind-gated Flash Cyber > Meta ships Muse Spark 1.3 and Muse Spark 1.3 contributor Sep 3: > OpenAI launches GPT-6 Astra, first model deployed at 'Critical' cyber level Sep 8: > Evan Hubinger: P(extinction) >10% within a decade > Jacob Coxon resigns from Anthropic Sep 9: > Jacob Coxon calls race 'could kill us all' > Meta launches Muse AI agent Sep 10: Cognition launched SWE-2 Sep 12: > Amodei - 'We Must Pace the Frontier' > Hacktron publishes 'Hacking OpenAI' blog; discloses HEIF Heist campaign Sep 15: > Google launches Gemini 3.8 Live and 3.8 Live Extended Thinking > TypeSafe AI exits stealth: first System One model Jev Sep 16: > OpenAI weighing ~$1.5tn private round before IPO Sep 17: > PrismML releases Ternary Bonsai 2 27B (ternary Qwen3.8 27B) Sep 18: > AI Evaluator Forum (METR member) publishes 'Minimum Conditions for Embedding Evaluators' > AI-hallucinated intel report nearly triggered US boarding of Chinese ship during Iran war > Google confirms Gemini breakout > Grok Voice Transcribe 2.0 released > Mistral officially denies breach claim (forum sale of 'full codebase') > Qwen3.8-Omni-Flash released > Jev + Mercury 2.5 solve 100% of WebMCP tasks at ~112x lower cost than GPT-6 Astra Sep 21: > Next Claude Opus release Sep 24: > Anthropic considering new Claude release to counter GPT-6 Astra > Google Nano Banana 2.5 image model > Kimi K3.1 teased by Moonshot via pi-string puzzle Sep 25: > Next OpenAI GPT Luna (5.7+) release Sep 26: > Grok 4.7 release expected (tester rumors): underwhelming vs Opus-Next More: > Anthropic full-lineup launch (rumored): Opus 5.2 / Fable 5.2 / new Sonnet together > Expected: Qwen-Image-2.1 (Alibaba) release What a time to live in, AI bubble is going to pop soon. Double model release by both openai and anthopic in the same month, while both support "pacing the frontier"