Image created with gemini-2.5-flash-image with claude-sonnet-4-5-20250929. Image prompt: A cinematic photograph of a modern smartphone displaying Twitter/X interface with two lit birthday candles emerging directly from the glowing screen, surrounded by swirling confetti in slate grey, deep blue, and rich red against a dark background with dramatic lighting, the candle flames reflecting in the glossy display creating a celebratory yet sophisticated tech aesthetic.
Grok 4 Fast | xAI https://x.ai/news/grok-4-fast
Grok Code Fast 1 | xAI https://x.ai/news/grok-code-fast-1
in my testing so far, i found grok-4-fast is to be fast af like 2x-3x fast (higher throughput, you can check exact numbers on openrouter) and takes much less reasoning time. it’s significantly weaker at instruction following than gpt-5-mini. the task i tested on was a large”” / X https://x.com/dejavucoder/status/1969383391029313598
The Grok-4-fast journey has been incredible—kicking off right after the Grok 4 launch in July. None of it happens without the absolute GOAT @s_tworkowski our incredibly talented teammates @LiTianleli @mycharmspace , and the unwavering backing from @Yuhu_ai_ . This kind of”” / X https://x.com/ShuyangGao62860/status/1969240703080546376
The new Grok 4 Fast seems to do well with creative coding challenges (“”create a visually interesting shader that can run in twigl, make it like the ocean in a storm””, “”make a futuristic starship panel for p5js””) for a small model but not quite as great in creative language tests https://x.com/emollick/status/1969477042203771150
With the new Grok 4 Fast, the price/performance curve for AI shifted again. I updated my chart to reflect I also think GPQA Diamond is likely maxed out (the tests themselves have errors, making it impossible to get to 100%), I am going to need to do this with a harder benchmark. https://x.com/emollick/status/1969845283816161726
Not to take away from Grok 4 Fast (which seems like a very good model) or from Artificial Analysis (one of the few organizations doing independent benchmarking), but the Intelligence Index is an average of pretty saturated benchmarks (aside from HLE), we really need better ones.”” / X https://x.com/emollick/status/1969270709361733942
Ashish Kumar, AI Lead for Optimus, has left Tesla to join Meta AI as a Research Scientist. https://x.com/TheHumanoidHub/status/1968841695820136852
GSA and xAI Partner on $0.42 per Agency Agreement to Accelerate Federal AI Adoption | GSA https://www.gsa.gov/about-us/newsroom/news-releases/gsa-xai-partner-to-accelerate-federal-ai-adoption-09252025
@techdevnotes Just as we will be the first to bring a Gigawatt of coherent training compute online, we will also be the first to 10GW, 100GW, 1TW, …”” / X https://x.com/elonmusk/status/1970358667422646709
xAI has released Grok 4 Fast – breaking through our intelligence vs cost frontier by achieving Gemini 2.5 Pro level intelligence at a ~25X cheaper cost Intelligence: @xai shared with us pre-release access to Grok 4 Fast. In reasoning mode, the model scores an impressive 60 on https://x.com/artificialanlys/status/1969180023107305846
Grok 4 Fast is out a multimodal reasoning model with a 2M context window that sets a new standard for cost-efficient intelligence Available for free on anycoder for vibe coding https://x.com/_akhaliq/status/1969431198859501622
Grok 4 Training Resource Footprint https://epochai.substack.com/p/grok-4-training-resource-footprint
Grok-4 Fast SVG test – not great https://x.com/scaling01/status/1969426187312156790
Team integrated @grok-4-fast-reasoning and @grok-coding-fast-1 this weekend. Fast as F…! More like Mach 4, not Grok 4. Congrats @xai team! 🇺🇸 https://x.com/ssankar/status/1970292424917574061
Paving the way for unlimited context windows. Introducing @zml_ai /attnd: sparse logarithmic attention, on CPU, over UDP, faster than GPU. https://x.com/steeve/status/1971126773204279495
Hiring for a new team building computer control agents. Join us to build Grok5 / macrohard later this year. DM me! Will send out a job post soon too.”” / X https://x.com/Yuhu_ai_/status/1970376941866991750
Elon Musk on X: “@yacineMTB Winning was never in the set of possible outcomes for Anthropic” / X
https://x.com/elonmusk/status/1970537297792651492
Elon Musk’s xAI raising $10 billion at $200 billion valuation: sources https://www.cnbc.com/2025/09/19/musks-xai-10-billion-at-200-billion-valuation.html
Musk says xAI is not raising capital after CNBC report on $10 billion funding https://finance.yahoo.com/news/xai-raises-10-billion-200-173421386.html?guccounter=2
The cost of intelligence continues to fall rapidly after new frontiers are reached: Grok 4 Fast brings the cost of the Intelligence Index >60 category down to just $0.2/$0.5 per million input/output tokens We track the lowest priced model for different tiers of intelligence to https://x.com/ArtificialAnlys/status/1970251031373390292
XAI OPENAI TRADE SECRETS LAWSUIT complaint2.pdf https://fingfx.thomsonreuters.com/gfx/legaldocs/byvreaygope/XAI%20OPENAI%20TRADE%20SECRETS%20LAWSUIT%20complaint2.pdf
Musk’s xAI sues OpenAI, alleging theft of trade secrets – Sherwood News https://sherwood.news/tech/musks-xai-sues-openai-alleging-theft-of-trade-secrets/
