Anthropic

Anthropic’s Claude models are widely regarded as the strongest option for instruction following and tool use. Pair Claude with a fast STT and TTS for voice agents that need to follow complex multi-turn flows reliably.

Get credentials

Sign in at https://console.anthropic.com.
Open API Keys in the sidebar (direct link: https://console.anthropic.com/settings/keys).
Click Create Key, name it, copy the sk-ant-... string.

Anthropic shows the key once. Store it before navigating away — you can’t retrieve it later, only revoke.

Configure in jambonz

In the portal: Account → LLM Services → + Add LLM Service → Anthropic.

API Key

stringRequired

The sk-ant-... secret from the Anthropic console.

Base URL

string

Defaults to https://api.anthropic.com. Override only for proxies or enterprise deployments.

Click Test to verify.

Use in an agent verb

1 session.agent({
2   llm: {
3     vendor: 'anthropic',
4     model: 'claude-haiku-4-5-20251001',
5     llmOptions: {
6       systemPrompt: 'You are a helpful voice assistant.',
7     },
8   },
9   stt: { vendor: 'deepgram', language: 'en-US' },
10   tts: { vendor: 'cartesia', voice: 'sonic-english' },
11   turnDetection: 'krisp',
12   bargeIn: { enable: true },
13   actionHook: '/agent-complete',
14 }).send();

Available Models

See Anthropic’s model catalog for the full list, capabilities, and current pricing. Common picks for voice agents:

Model	When to use
`claude-haiku-4-5-20251001`	Default for voice — fast, cheap, tool-capable, vision
`claude-sonnet-4-6`	Mid-tier; better reasoning than Haiku, lower latency than Opus
`claude-opus-4-7`	Highest-quality model; slower and more expensive

Quirks & errors

Vision support varies by model. Claude Sonnet and Opus accept image inputs; Claude Haiku 3.5 does not. Haiku 4.5 supports vision. If you need to pass images, double-check the model in the Anthropic model comparison.

401 invalid_api_key — the key was revoked or has typos. Regenerate at console.anthropic.com/settings/keys.

429 rate_limit_error — you’ve hit Anthropic’s per-minute or per-day rate limits. Reduce traffic or request a higher tier from Anthropic support. Note: Anthropic’s rate limits are stricter than OpenAI’s at equivalent tiers.