Anthropic

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Pay with credits (no Anthropic account)

import anthropic

client = anthropic.Anthropic(
    base_url="https://gateway.ngrok.ai",
    api_key="ng-xxxxx-g1-xxxxx",  # Access key
)

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}]
)

curl https://gateway.ngrok.ai/v1/messages \
  -H "Content-Type: application/json" \
  -H "x-api-key: ng-xxxxx-g1-xxxxx" \
  -H "anthropic-version: 2023-06-01" \
  -d '{"model": "claude-sonnet-4-6", "max_tokens": 1024, "messages": [{"role": "user", "content": "Hello!"}]}'

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Bring your own Anthropic key

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Explicit provider routing

message = client.messages.create(
    model="anthropic:claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}]
)

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Available models

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Parameters the gateway removes

• speed on every Claude model. Fast mode isn’t available through the gateway, so a request with "speed": "fast" runs and bills at standard speed.
• temperature, top_p, and top_k on the models that reject them: the Claude Fable models, Claude Opus 4.7 and later, Claude Sonnet 5 and later, and Claude Haiku 5.5.
• reasoning_effort on Chat Completions requests to every Claude model. To set the effort level, send an Anthropic Messages request to /v1/messages with output_config, which the gateway forwards.

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Fable 5.2

• Forces tool use with tool_choice.
• Sets thinking to enabled or disabled.
• Uses the computer_20251124 tool instead of computer_toolset_20260801.
• Edits the system prompt, the tools, or an earlier message, and then sends back a Claude Fable 5.2 thinking block.

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Files

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Next steps

• Access Keys
• Access Key Configurations
• Provider Keys