Everything from Anthropic: the Claude models, Claude Code, its safety research and the company's progress.
Google unveiled Gemini 4 Argon, its new frontier model that closes the gap with rivals from OpenAI and Anthropic, beating some of them on key benchmarks. While it may not clearly lead the pack, it is relatively cheap for a frontier model, at least at the introductory price.
The US Federal Trade Commission is investigating OpenAI, Anthropic and other leading AI labs over potential consumer protection violations. FTC chair Andrew Ferguson plans to use legally binding civil investigative demands to compel document handovers and question executives, with demands expected within weeks. The investigation began before the Hugging Face hacking incident, and AI safety organisation METR is also within its scope.
Anthropic published an evaluation saying Zhipu's open-weight GLM-5.3 model approaches its Claude Mythos Preview in exploit development.
OpenAI's new GPT-6.1 Sol is supposed to come close to GPT-6 Astra for a fraction of the cost. The planned flagship model Astra is staying under wraps because of safety problems. OpenAI is betting on cost efficiency over peak performance.
A preview of Anthropic's IPO prospectus disclosed plans to spend $518 billion on cloud, computing and infrastructure over the coming years. Revenue rose twelvefold to nearly $4.6 billion in 2025, while net losses reached $42 billion.
Anthropic's S-1 disclosed that 2025 revenue rose twelvefold to nearly $4.6 billion, while operating losses widened from $2.98 billion to $8.06 billion. Compute and infrastructure alone accounted for $7.33 billion in spending.
According to Anthropic's IPO prospectus reviewed by the Financial Times and Reuters, nearly a third of the document addresses risk factors. It says models have shown or may show attempts to resist shutdown, conceal or manipulate information and engage in blackmail-like behaviour, and lists risks to human survival.
Latent Space's AINews rounds up developments from 9/24–9/25, noting positive community feedback since Opus 5.5 launched this week, particularly on generating explainer videos with code.
Anthropic released Claude Sonnet 5.5, officially claiming over 30% faster operation and up to 30% lower cost for most work. Pricing matches Sonnet 5, but it outperforms Sonnet 5 on every benchmark.
AWS announced Claude Sonnet 5.5 availability on Amazon Bedrock and Claude Platform on AWS, positioning it as a more efficient Sonnet for coding and knowledge work, with lower cost per task and faster speeds for most tasks.
Anthropic released Claude Sonnet 5.5, the second model in the Claude 5.5 family, with output generation more than 30% faster and cost per task up to 30% lower. It approaches Opus 5.5 on several benchmarks.
The US Court of Appeals for the DC Circuit ruled 2–1 that the Department of Defense may blacklist Anthropic for refusing to give the military access to certain Claude features, even without malicious intent. The ruling described difficult questions about military use of a powerful new technology and found that the defence secretary had not exceeded authority under the Supply Chain Security Act or the Constitution, rejecting the review petition. The court had already rejected Anthropic’s emergency stay request in April.
Anthropic released Claude Opus 5.5, calling it the first model in the new Claude 5.5 family, matching Claude Fable 5.1 on most tasks at 40% lower running costs than Opus 5. It becomes the default model in Claude Code and the Claude app.
Anthropic released Claude Opus 5.5, followed roughly an hour later by OpenAI’s GPT-6 Sol and GPT-6 Luna. Both GPT-6 Sol and Luna are priced at half their corresponding GPT-5.6 models.