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Anthropic offers 15 models through Lava’s AI Gateway, supporting Chat Completions (Native). Authentication uses x-api-key. See the Anthropic API docs for provider-specific parameters.
Supports both managed (Lava’s API keys) and unmanaged (bring your own credentials) mode.

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Quick Start

const response = await fetch('https://api.lava.so/v1/forward?u=https%3A%2F%2Fapi.anthropic.com%2Fv1%2Fmessages', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': forwardToken,
  },
  body: JSON.stringify({
    model: 'claude-sonnet-4-6',
    messages: [{ role: "user", content: "Hello!" }],
  }),
});

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Chat Completions (Native)

Target URL: https://api.anthropic.com/v1/messages
Content Typeapplication/json
StreamingYes (set stream: true in request body)
ModelInput / 1M tokensOutput / 1M tokens
claude-opus-4-1$15.00$75.00
claude-opus-4-1-20250805$15.00$75.00
claude-opus-4-0$15.00$75.00
claude-opus-4-20250514$15.00$75.00
claude-opus-4-6$5.00$25.00
claude-opus-4-5$5.00$25.00
claude-opus-4-5-20251101$5.00$25.00
claude-sonnet-4-6$3.00$15.00
claude-sonnet-4-5$3.00$15.00
claude-sonnet-4-5-20250929$3.00$15.00
claude-sonnet-4-0$3.00$15.00
claude-sonnet-4-20250514$3.00$15.00
claude-haiku-4-5$1.00$5.00
claude-haiku-4-5-20251001$1.00$5.00
claude-3-haiku-20240307$0.25$1.25

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Next Steps

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