Meta Muse Spark Open: The Most Capable US Open-Weight Model Now Runs on Macs
Meta releases Muse Spark Open: 816B parameters, 1M-token context, free weights, runs on two M5 Ultra Mac Studios, and $1.25 per million input tokens on OpenRouter.
AI models
Meta Muse Wonder: the First Frontier Model with Active Memory — Full Guide
Meta enters the frontier race with Muse Wonder: Active Memory, long-horizon focus, at 4 USD per million input tokens and 20 USD per million output tokens. The complete guide: numbers, pricing, and caveats.
Gemini 4 Argon: Google's Most Powerful Model Yet — and Its Surprising Catch
Google launches Gemini 4 Argon: 77.9% on long-horizon coding, $2 per million input tokens, 1M-token outputs — but initial access is limited to trusted cyber defenders.
Claude Sonnet 5.5: 30% Faster and Up to 30% Cheaper Than Sonnet 5
Anthropic released Claude Sonnet 5.5 on September 28, 2026: same listed price as Sonnet 5, over 30% faster, up to 30% cheaper per task, and second worldwide on the Intelligence Index behind Opus 5.5.
GPT-6.1 Sol: OpenAI's Near-Astra Model at a Fifth of the Price
OpenAI's GPT-6.1 Sol costs $2/$10 per million tokens with a 1.05M-token context window, lands one point below GPT-6 Astra on independent benchmarks, and cuts cost per task to under a quarter.
Claude Opus 5.5: Fable-Level Performance at 40% Lower Cost
Claude Opus 5.5 opens the Anthropic 5.5 family: Fable 5.1-level performance at 40% lower running cost, $4/$20 per million tokens, and 30% faster output than Opus 5.
OpenAI's GPT-6 Sol and Luna: Half the API Price, Fewer Mistakes
OpenAI's GPT-6 Sol and Luna cut API prices to half of the 5.6 series and halve mistakes in internal tests. Here is what each model does and when you get it in ChatGPT.
Grok 4.7 Launch: xAI's Coding Model Costs $2 per Million Tokens
Grok 4.7 is SpaceXAI's most capable model for coding and knowledge work, launched September 21, 2026 at $2 input / $6 output per million tokens — same price as Grok 4.6, with major gains.
OpenAI's GPT-Live-1 API: The Voice Model That Listens and Speaks at Once
OpenAI's GPT-Live-1 API brings full-duplex voice to developers at $0.05/minute: +30 points over GPT-Realtime-2.1, telephony support, and a swappable reasoning backend like GPT-6 Astra.
DeepSeek V4.1 Flash Launches at 70% Below V4 Pro: Pricing and Specs
DeepSeek V4.1 Flash cuts output pricing to $0.60 per million tokens off-peak — 70% below V4 Pro — with 1M context, 2,500 concurrency, and open weights on Hugging Face.