Changelog

Grok 4.2 is the next major iteration of xAI's Grok series, advancing the model's reasoning, coding, and multimodal capabilities with architectural improvements over Grok 4 and 4.1. It is positioned as a more powerful and general-purpose frontier AI model in the Grok family with stronger deep reasoning and real-world task performance.

The full Qwen 3.5 series is provided at **Apertis Coding Plan** as well, Enjoy it.

Gemini 3.1 Flash Image Preview (also known as "Nano Banana 2") is Google's latest state-of-the-art image generation and editing model, delivering Pro-level visual quality at Flash-level speed. It combines strong contextual understanding with fast, cost-efficient inference, enabling high-quality image generation and seamless iterative editing. Optimized for both performance and accessibility, it makes advanced visual creation workflows faster and more scalable.

New feature: Cached responses now support streaming (SSE) delivery, covering ~80% of API traffic that uses stream: true.

• On cache hit, the system emits synthetic SSE chunks from the stored response — no upstream API call needed
• Content is split on rune boundaries (50 runes/chunk, 10ms intervals) to preserve multi-byte characters
• Proper X-Cache-Hit, X-Cached-Tokens, and X-Actual-Model headers on streaming cache hits
• Non-streaming cache hits continue to work as before (direct JSON response)

Cache Correctness Hardening

• Temperature guard: Only caches requests where temperature: 0 is explicitly present in the raw JSON body. Omitted temperature (Go zero value 0.0) is no longer falsely treated as

cacheable — providers default to ~1.0 for omitted values

• SSE error safety: If synthetic SSE emission fails mid-stream, the handler returns immediately instead of falling through to normal processing, preventing HTTP double-write

corruption

• Tool call exclusion: Responses containing tool_calls are excluded from cache storage since the SSE emitter only supports text content replay