Anthropic Claude Configuration

Configure a Claude API key from Anthropic for use with RoostGPT.

Step 1: Create an Anthropic Account

1. Visit console.anthropic.com
2. Click "Sign Up" or "Get Started"
3. Complete registration with email verification

Step 2: Generate an API Key

1. Log into the Anthropic Console

2. Navigate to "API keys" in the left sidebar

3. Click "Create API key"

4. Configure:

   • Workspace: Select your workspace (or "Default")
   • Name: Enter a descriptive name (e.g., RoostGPT-Production)

   

5. Click "Add"

6. Copy the key immediately — it starts with sk-ant-api03- and is shown only once

Step 3: Add to RoostGPT

Web UI (Connector)

1. Click Connectors in the top navigation bar → AI Model
2. Select Claude AI
3. Paste your API key
4. Select your default model

CLI (.env file)

AI_TYPE=claude_ai
CLAUDE_AI_API_KEY=sk-ant-api03-...your_key...
CLAUDE_AI_MODEL=claude-sonnet-4-20250514

Recommended Models

Model	ID	Context	Output	Pricing	Best For
Claude Sonnet 4 (Primary)	claude-sonnet-4-20250514	200K–1M	64K	$3/1M in, $15/1M out	All RoostGPT tasks — best balance
Claude Opus 4.1 (Premium)	claude-opus-4-1-20250805	200K	32K	$15/1M in, $75/1M out	Most demanding tasks, critical analysis
Claude Haiku 3.5 (Budget)	claude-3-5-haiku-20241022	200K	8K	$0.25/1M in, $1.25/1M out	High-volume, speed-critical tasks

Start with claude-sonnet-4-20250514 — optimal balance of performance, speed, and cost for RoostGPT.

Model Feature Comparison

Feature	Sonnet 4	Opus 4.1	Haiku 3.5
Extended Thinking	✅	✅ (most advanced)	❌
Multimodal (Vision)	✅	✅	✅
Latency	Fast	Moderate	Fastest
SWE-bench Score	—	74.5%	—
Training Data	Mar 2025	Mar 2025	Jul 2024

Notes

• Claude models have a 200K default context window, expandable to 1M with a beta header (Sonnet 4)
• The large output capacity (64K tokens on Sonnet 4) is ideal for comprehensive code generation
• Extended thinking on Opus 4.1 is best for complex debugging and architecture-level reasoning