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The 6 top stories of the 120 AIBriefs curated today.
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Carbon tops the Artificial Analysis Intelligence Index v5.0 at 59, ahead of Claude Opus 5.5 and GPT-6 Astra, and leads 15 of 17 published benchmarks. Access starts with vetted cybersecurity defense firms via the Fairwind Program, not the public API; pricing is $2/M input and $10/M output tokens.
Genie 4 generates real-time interactive worlds with on-the-fly ambient sound, music, and dialogue, steerable mid-simulation via natural language. It builds on Gemini models — Gemini Omni anchors appearance and behavior — and is a research preview for trusted testers.
GPT-6.1 Terra replaces GPT-5.6 Terra at $1/M input and $5/M output tokens, with a 1.05M-token context and 128K max output. It scores 85.5% on MMMU-Pro vision at max effort, 1.2 points behind GPT-6 Astra, but only 50.3% on Terminal-Bench 4.0.
Anthropic, PBC filed a Form S-1 with the SEC for a proposed IPO of Class A common stock on the Nasdaq Global Select Market under the symbol "ANT"; share count and price range are not yet set. Coverage cites $417B in future AI spending commitments and a governance structure giving seven cofounders Class F shares with ~50.1% of voting power.
OpenAI released AI-generated results on the Kakeya conjecture, a refutation of the 1999 Exponential Time Hypothesis, and a physics finding it has not yet published. Each discipline got a different release strategy, with external "shepherds" deciding how to share the work.
The release covers 90 of the top 500 open problems per Proof of Atlas, organized into 372 families, with Lean formalizations on GitHub. Zvi Mowshowitz reports a single model averaged three hours of Pro-level compute per solution after being asked to try ~4,000 problems.
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