Google: Gemma 3 4B (free)

google/gemma-3-4b-it:free

Created Mar 13, 202532,768 context

$0/M input tokens$0/M output tokens

Gemma 3 introduces multimodality, supporting vision-language input and text outputs. It handles context windows up to 128k tokens, understands over 140 languages, and offers improved math, reasoning, and chat capabilities, including structured outputs and function calling.

Google: Gemma 3 4B (free)

google/gemma-3-4b-it:free

Created Mar 13, 202532,768 context

$0/M input tokens$0/M output tokens

Sample code and API for Gemma 3 4B (free)

OpenRouter normalizes requests and responses across providers for you.

OpenRouter provides an OpenAI-compatible completion API to 400+ models & providers that you can call directly, or using the OpenAI SDK. Additionally, some third-party SDKs are available.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.