For comparison on openrouter DeepSeek v4 Flash is slightly cheaper than Gemma 4 31b, more expensive than Gemma 4 26b, but it does support prompt caching, which means for some applications it will be the cheapest. Excited to see how it compares with Gemma 4.
I wonder why there aren't more open weights model with support for prompt caching on OpenRouter.
It is tricky to build good infrastructure for prompt caching.
Its as simple as telling your claude code to implement prompt caching!