New models and versions, open weights, and changes in capability and pricing, with their evaluations.
Artificial Analysis evaluated SpaceXAI’s Grok Voice 3.0 using the Rex voice through the SpaceXAI Realtime API, reporting a #1 Speech to Speech Index score of 86.9, up from Grok Voice 2.0 at 81.3. It ranked #3 in arena preference and #1 in task success rate at 94.8%. Average time to first audio on Big Bench Audio was 0.81 seconds versus 0.70s for Grok Voice 2.0, while input audio pricing remained $4.80 per hour.
Artificial Analysis reports that Grok Imagine Video 1.5 Lite ranks #17 on both AA-Video-T2V v2.0 and AA-Video-T2V-Silent v2.0, ahead of Google's Veo 3.1 at about a third of its price. Its median generation time of 60.5 seconds for a 10 second 1080p clip places it on the quality and speed Pareto frontier. SpaceXAI prices 1080p output at $0.14 per second ($8.40 per minute), with availability through the SpaceXAI API, fal at the same prices, and Vercel AI Gateway.
Latent Space's AINews roundup of developments from September 24–25 says community feedback was positive after Opus 5.5 launched that week, especially for generating explainer videos with code.
Why it matters: The weekly roundup offers a quick look at model and agent-infrastructure developments, including community feedback on Opus 5.5's code-generated videos and how vendors position their new models.
Anthropic released Claude Opus 5.5, and about an hour later OpenAI released GPT-6 Sol and GPT-6 Luna. The author says GPT-6 Sol and Luna cost half as much as their GPT-5.6 counterparts.
Why it matters: The author tests several models released the same day, provides a full price table, and describes specific cases where reasoning levels failed.
