OpenAI Realtime API GA and new `gpt-realtime` model, 20% cheaper than 4o

**OpenAI** launched the **gpt-realtime** model and **Realtime API** to GA, featuring advanced speech-to-speech capabilities, new voices (**Cedar**, **Marin**), image input, SIP telephony, and a ~20% price cut. Benchmarks show improvements over **gpt-4o-realtime** on BigBench and ComplexFuncBench. **xAI** introduced **Grok Code Fast 1**, a speed-optimized coding model integrated with popular IDEs, while **OpenAI Codex** received major upgrades for local and cloud development workflows. Google’s **Gemini CLI** improved multi-editor support, and new models like **Microsoft MAI-1-preview** and **MAI-Voice-1** were announced. *"The new all-in-one WebRTC API removes the ephemeral token step and supports video on the same connection,"* highlighting enhanced developer tooling.