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Claude Sonnet 4 20250514

claude-sonnet-4-20250514

Claude Sonnet 4 20250514 is available on Swarms Cloud through our Agent Completions API, no separate provider account or API key required. Run it as a standalone agent with the Agent Completions API, enable tools, structured outputs, and autonomous loops, or orchestrate it inside multi-agent swarms alongside models from other providers. Claude Sonnet 4 20250514 also supports vision tasks: pass base64-encoded images and it can analyze, describe, and answer questions about them.

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Quick start

Get started with Claude Sonnet 4 20250514

1

Get your Swarms API key

Create an API key from your API keys dashboard or at swarms.world/platform/api-keys.

2

Set it in your environment

# .env
SWARMS_API_KEY="your-api-key"

# or export it in your shell
export SWARMS_API_KEY="your-api-key"
3

Run a single agent

Execute one agent with claude-sonnet-4-20250514 via the Agent Completions API.

Single agent completion

curl -X POST 'https://api.swarms.world/v1/agent/completions' \
  -H 'x-api-key: '"$SWARMS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "agent_config": {
    "agent_name": "Research Analyst",
    "description": "Expert in analyzing and synthesizing research data",
    "system_prompt": "You are a Research Analyst with expertise in data analysis and synthesis.",
    "model_name": "claude-sonnet-4-20250514",
    "max_loops": 1,
    "max_tokens": 8192,
    "temperature": 0.5
  },
  "task": "Analyze the impact of artificial intelligence on healthcare"
}'
4

Scale to a multi-agent swarm

Chain multiple agents on claude-sonnet-4-20250514 with the Swarm Completions API.

Multi-agent swarm

curl -X POST 'https://api.swarms.world/v1/swarm/completions' \
  -H 'x-api-key: '"$SWARMS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "name": "Research Swarm",
  "description": "A two-agent research and analysis pipeline",
  "swarm_type": "SequentialWorkflow",
  "task": "Research the latest developments in renewable energy and summarize the top 3 trends",
  "agents": [
    {
      "agent_name": "Researcher",
      "description": "Gathers and organizes source material",
      "system_prompt": "You are a meticulous researcher. Collect relevant facts and organize them clearly.",
      "model_name": "claude-sonnet-4-20250514",
      "max_loops": 1
    },
    {
      "agent_name": "Analyst",
      "description": "Synthesizes research into actionable insights",
      "system_prompt": "You are an analyst. Turn the research into a concise, actionable summary.",
      "model_name": "claude-sonnet-4-20250514",
      "max_loops": 1
    }
  ],
  "max_loops": 1
}'

Frequently asked questions

How do I use Claude Sonnet 4 20250514 with the Swarms API?

Set your SWARMS_API_KEY environment variable, then send a POST request to /v1/agent/completions with agent_config.model_name set to "claude-sonnet-4-20250514". The API works from Python, TypeScript, cURL, or any HTTP client.

Can I use Claude Sonnet 4 20250514 in a multi-agent swarm?

Yes. Pass "claude-sonnet-4-20250514" as the model_name of any agent in a POST to /v1/swarm/completions. You can mix it with other models across 17+ swarm architectures such as SequentialWorkflow, ConcurrentWorkflow, and HierarchicalSwarm.

How is Claude Sonnet 4 20250514 billed on Swarms Cloud?

Usage is billed per input and output token. See the Swarms Cloud pricing page for the token cost calculator and current rates.

Do I need a separate provider API key to use Claude Sonnet 4 20250514?

No. A single Swarms API key gives you access to every model in the catalog through one agent completions API, no separate provider accounts required.