docs: add DeepInfra provider documentation

Author: roomote

docs/providers/deepinfra.md

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+---
+sidebar_label: DeepInfra
+description: Configure DeepInfra's high-performance AI models in Roo Code. Access Qwen Coder, Llama, and other open-source models with prompt caching and vision capabilities.
+keywords:
+  - deepinfra
+  - deep infra
+  - roo code
+  - api provider
+  - qwen coder
+  - llama models
+  - prompt caching
+  - vision models
+  - open source ai
+image: /img/social-share.jpg
+---
+
+# Using DeepInfra With Roo Code
+
+DeepInfra provides cost-effective access to high-performance open-source models with features like prompt caching, vision support, and specialized coding models. Their infrastructure offers low latency and automatic load balancing across global edge locations.
+
+**Website:** [https://deepinfra.com/](https://deepinfra.com/)
+
+---
+
+## Getting an API Key
+
+1. **Sign Up/Sign In:** Go to [DeepInfra](https://deepinfra.com/). Create an account or sign in.
+2. **Navigate to API Keys:** Access the API keys section in your dashboard.
+3. **Create a Key:** Generate a new API key. Give it a descriptive name (e.g., "Roo Code").
+4. **Copy the Key:** **Important:** Copy the API key immediately. Store it securely.
+
+---
+
+## Supported Models
+
+Roo Code dynamically fetches available models from DeepInfra's API. The default model is:
+
+* `Qwen/Qwen3-Coder-480B-A35B-Instruct-Turbo` (256K context, optimized for coding)
+
+Common models available include:
+
+* **Coding Models:** Qwen Coder series, specialized for programming tasks
+* **General Models:** Llama 3.1, Mixtral, and other open-source models
+* **Vision Models:** Models with image understanding capabilities
+* **Reasoning Models:** Models with advanced reasoning support
+
+Browse the full catalog at [deepinfra.com/models](https://deepinfra.com/models).
+
+---
+
+## Configuration in Roo Code
+
+1. **Open Roo Code Settings:** Click the gear icon (<Codicon name="gear" />) in the Roo Code panel.
+2. **Select Provider:** Choose "DeepInfra" from the "API Provider" dropdown.
+3. **Enter API Key:** Paste your DeepInfra API key into the "DeepInfra API Key" field.
+4. **Select Model:** Choose your desired model from the "Model" dropdown.
+   - Models will auto-populate after entering a valid API key
+   - Click "Refresh Models" to update the list
+
+---
+
+## Advanced Features
+
+### Prompt Caching
+
+DeepInfra supports prompt caching for eligible models, which:
+- Reduces costs for repeated contexts
+- Improves response times for similar queries
+- Automatically manages cache based on task IDs
+
+### Vision Support
+
+Models with vision capabilities can:
+- Process images alongside text
+- Understand visual content for coding tasks
+- Analyze screenshots and diagrams
+
+### Custom Base URL
+
+For enterprise deployments, you can configure a custom base URL in the advanced settings.
+
+---
+
+## Tips and Notes
+
+* **Performance:** DeepInfra offers low latency with automatic load balancing across global locations.
+* **Cost Efficiency:** Competitive pricing with prompt caching to reduce costs for repeated contexts.
+* **Model Variety:** Access to the latest open-source models including specialized coding models.
+* **Context Windows:** Models support context windows up to 256K tokens for large codebases.
+* **Pricing:** Pay-per-use model with no minimums. Check [deepinfra.com](https://deepinfra.com/) for current pricing.