Anthropic

Website: https://www.anthropic.com/

Obtaining Your API Key

1. Account Access: Navigate to the Anthropic Console. Register for a new account or log into your existing one.
2. Access API Keys Section: Proceed to the API keys area.
3. Generate New Key: Select "Create Key" and assign a meaningful name to your key (such as "Sypha").
4. Secure Your Key: Critical: Make sure to copy your API key right away. This will be your only opportunity to view it. Keep it in a safe location.

Available Models

The following Anthropic Claude models are compatible with Sypha:

• claude-haiku-4-5-20251001
• claude-opus-4-1-20250805
• claude-opus-4-20250514
• anthropic/claude-sonnet-4.5 (Recommended)
• claude-3-7-sonnet-20250219
• claude-3-5-sonnet-20241022
• claude-3-5-haiku-20241022
• claude-3-opus-20240229
• claude-3-haiku-20240307

For comprehensive information about each model's features and performance, consult Anthropic's Model Documentation.

Setting Up Sypha

1. Access Settings: Select the settings icon (⚙️) within the Sypha panel.
2. Choose Provider: Pick "Anthropic" from the available options in the "API Provider" menu.
3. Add API Key: Insert your Anthropic API key into the designated "Anthropic API Key" input field.
4. Choose Model: Pick your preferred Claude model from the available options in the "Model" menu.
5. (Optional) Alternative Base URL: Should you require a custom base URL for accessing the Anthropic API, enable "Use custom base URL" and provide the appropriate URL. This configuration is typically unnecessary for most users.

Extended Thinking

The "Extended Thinking" capability available in Anthropic models is engineered to enhance their reasoning abilities when tackling complex problems. This functionality enables the model to display its sequential thought process prior to providing a final response, offering transparency and facilitating more comprehensive analysis of challenging queries.

When extended thinking is activated in Sypha, the model produces thinking content blocks that reveal its internal reasoning process. These thought processes are subsequently integrated into the final response. Users of Sypha can enable this functionality by selecting the Enable Extended Thinking checkbox located beneath the model selection area after choosing a Claude Model from any provider.

Important Characteristics of Extended Thinking:

• Compatible Models: This capability is accessible for specific models, including Claude Opus 4, Claude Sonnet 4.5, and Claude Sonnet 3.7.
• Condensed Thinking (Claude 4): With Claude 4 and 4.5 models, the API provides a condensed version of the complete thinking process to optimize the balance between insight and efficiency while preventing potential misuse. Billing is based on the complete thinking tokens, not merely the condensed summary.
• Streaming: Both extended thinking responses and the thinking blocks support streaming functionality.
• Tool Integration & Prompt Caching: Extended thinking works in conjunction with tool use (necessitating the return of thinking blocks) and prompt caching (with particular behaviors related to cache invalidation and context management).

For in-depth information about extended thinking functionality, including API implementation examples, tool use integration, prompt caching details, and cost structure, please consult the official Anthropic documentation on Extended Thinking.

Additional Information and Recommendations

• Prompt Caching: The Claude 3 model lineup includes support for prompt caching, a feature that can substantially decrease both costs and response times when working with recurring prompts.
• Context Window: Claude models feature extensive context windows (200,000 tokens), enabling you to incorporate substantial amounts of code and contextual information within your prompts.
• Pricing: For current pricing details, visit the Anthropic Pricing page.
• Rate Limits: Anthropic enforces stringent rate limitations according to usage tiers. Should you frequently encounter rate limit restrictions, consider reaching out to Anthropic sales or utilizing Claude via an alternative provider such as OpenRouter or Requesty.