xAI launches Grok 4.3, featuring “always-on reasoning”, 1M token context window, and low API pricing, and releases a voice cloning suite called Custom Voices
While Elon Musk faces off against his former colleague and OpenAI co-founder Sam Altman in court, Musk's rival firm xAI …
VentureBeat Carl Franzen
Related Coverage
- xAI drops Grok 4.3 with steep price cuts and an Imagine agent mode for creative projects The Decoder · Matthias Bastian
- Grok 4.3 Hacker News
- xAI's new Custom Voices feature turns a minute of speech into a usable voice clone The Decoder · Matthias Bastian
Discussion
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@veggie_eric
Eric Jiang
on x
When training Grok 4.3, we spoke directly with devs and businesses to understand what they actually needed: a model that's fast, affordable, and great at tool calling. The result is a daily driver that doesn't just look good on random benchmarks, but is actually useful in the re…
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@andonlabs
@andonlabs
on x
Grok 4.3 is a big regression from Grok 4.20 on Vending-Bench 2. It seems to have narcolepsy problems, preferring to sleep for multiple days in a row over taking actions. [image]
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@artificialanlys
@artificialanlys
on x
The release of Grok 4.3 places @xAI just above Muse Spark and Claude Sonnet 4.6 on the Intelligence Index, and a 4 points ahead of the latest version of Grok 4.20. Grok 4.3 improves its Artificial Analysis Intelligence Index score while reducing cost to run the benchmark suite.
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@arena
@arena
on x
Grok 4.3 by @xAI is now live in the Arena, landing across multiple leaderboards. At $1.25 / $2.50 price per 1M token, Grok 4.3 comes with more efficiency over Grok 4.20 (37.5% less for input, and 58.3% less for output).
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@adityagupta
Aditya Gupta
on x
great work by the team. 4.3 pushes the pareto (+4pts on AA and +13 for the same size as 4.20 ~0.5T) w/ knowledge work and coding improvements. ps: larger models being assembled in model factory.
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@kimmonismus
@kimmonismus
on x
Grok 4.3 is a very good model especially when you think its only 500m parameters! xAI's Grok 4.3 scores 53 on the Artificial Analysis Intelligence Index with ~40% lower input and ~60% lower output pricing vs Grok 4.20, making it one of the most cost-efficient models at its [image…
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@jshobrook
Jonathan Shobrook
on x
We beat Sonnet 4.6 with a 500B model. Bigger runs are on the way.
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@eliebakouch
Elie
on x
genuine question, why have a 500B total parameter flagship model when you have millions of H100s equivalent? i would expect them to train a bigger one first (once you have a stable training recipe ofc) and distill from it. a 500B training run is a matter of weeks at this scale
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@artificialanlys
@artificialanlys
on x
This release shows increased cost efficiency to run the Artificial Analysis Intelligence Index, with Grok 4.3 sitting comfortably on the Pareto frontier for intelligence versus cost