OpenAI releases GPT-5.5 with coding improvements; DeepSeek open-sources V4 with 1M-token context; Google plans up-to-$40B investment in Anthropic

OpenAI released GPT-5.5 featuring strong coding-oriented improvements, a system card discussing chain-of-thought monitorability and misalignment testing, and higher pricing than GPT-5.4. DeepSeek open-sourced DeepSeek V4 (Pro and Flash) with MoE scaling and 1M-token context via hybrid/compressed attention changes.

xAI launched Grok Voice Think Fast 1.0, claiming large benchmark leads for real-time voice agents (a type of AI that interacts through spoken language), and reported major Starlink customer-support automation and sales conversion impact. Tencent released Hunyuan 3 preview with weaker benchmark performance.

Google announced plans for up-to-$40 billion investment and 5GW compute commitment to Anthropic. Meta agreed to an AWS Gravitron chip deal, while China blocked Meta's $2 billion takeover of AI startup Manus. OpenAI revised its partnership agreement with Microsoft, capping revenue share payments.