Add readme

Author: fwang

README.md

@@ -0,0 +1,87 @@
+# Models.dev
+
+A comprehensive database of AI model specifications, pricing, and capabilities.
+
+## Contributing
+
+We welcome contributions to expand our model database! Follow these steps to add a new model:
+
+### Adding a New Model
+
+#### 1. Create Provider (if it doesn't exist)
+
+If the AI provider doesn't already exist in the `providers/` directory:
+
+1. Create a new folder in `providers/` with the provider's ID (e.g., `providers/newprovider/`)
+2. Add a `provider.toml` file with the provider information:
+
+```toml
+name = "Provider Name"
+```
+
+#### 2. Add Model Definition
+
+Create a new TOML file in the provider's `models/` directory where the filename is the model ID:
+
+```toml
+name = "Model Display Name"
+attachment = true  # or false - supports file attachments
+reasoning = false  # or true - supports reasoning/chain-of-thought
+temperature = true # or false - supports temperature parameter
+
+[cost]
+input = 3.00          # Cost per million input tokens (USD)
+output = 15.00        # Cost per million output tokens (USD)
+inputCached = 0.30    # Cost per million cached input tokens (USD)
+outputCached = 0.30   # Cost per million cached output tokens (USD)
+
+[limit]
+context = 200_000     # Maximum context window (tokens)
+output = 8_192        # Maximum output tokens
+```
+
+#### 3. Submit Pull Request
+
+1. Fork this repository
+2. Create a new branch for your changes
+3. Add your provider and/or model files
+4. Open a pull request with a clear description
+
+### Validation
+
+GitHub Actions will automatically validate your submission against our schema to ensure:
+
+- All required fields are present
+- Data types are correct
+- Values are within acceptable ranges
+- TOML syntax is valid
+
+### Schema Reference
+
+Models must conform to the following schema (defined in `app/schemas.ts`):
+
+**Provider Schema:**
+- `name`: String - Display name of the provider
+
+**Model Schema:**
+- `name`: String - Display name of the model
+- `attachment`: Boolean - Whether the model supports file attachments
+- `reasoning`: Boolean - Whether the model supports reasoning capabilities
+- `temperature`: Boolean - Whether the model supports temperature control
+- `cost.input`: Number - Cost per million input tokens (USD)
+- `cost.output`: Number - Cost per million output tokens (USD)
+- `cost.inputCached`: Number - Cost per million cached input tokens (USD)
+- `cost.outputCached`: Number - Cost per million cached output tokens (USD)
+- `limit.context`: Number - Maximum context window in tokens
+- `limit.output`: Number - Maximum output tokens
+
+### Examples
+
+See existing providers in the `providers/` directory for reference:
+- `providers/anthropic/` - Anthropic Claude models
+- `providers/openai/` - OpenAI GPT models
+- `providers/google/` - Google Gemini models
+
+### Questions?
+
+Open an issue if you need help or have questions about contributing.

providers/anthropic/models/claude-sonnet-4-20250514.toml

@@ -2,7 +2,6 @@ name = "Claude 4 Sonnet"
 attachment = true
 reasoning = false
 temperature = true
-temperature = true
 
 [cost]
 input = 3.00