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Native Protocol Support

All Anthropic models on this site can be accessed via the native /v1/messages protocol. For example, to activate the 1M-token context, you can use the following request: 
curl https://api.highwayapi.ai/anthropic/v1/messages \
  -H "x-api-key: $API_KEY" \
  -H "anthropic-beta: context-1m-2025-08-07" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-20250514",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "Process this large document..."}
    ]
  }'

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Prompt caching

This site supports using Prompt caching via either the Anthropic protocol or the OpenAI-compatible protocol. For details, see the documentation Model Features - Prompt caching.

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Extended thinking

Currently, the thinking process can only be controlled via the Anthropic protocol. 
curl https://api.highwayapi.ai/anthropic/v1/messages \
     -H "x-api-key: $API_KEY" \
     -H "content-type: application/json" \
     -d \
'{
    "model": "claude-sonnet-4-20250514",
    "max_tokens": 16000,
    "thinking": {
        "type": "enabled",
        "budget_tokens": 10000
    },
    "messages": [
        {
            "role": "user",
            "content": "Are there an infinite number of prime numbers such that n mod 4 == 3?"
        }
    ]
}'

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Tools

Currently, only Bash and Text editor are supported. Computer use, Web fetch, Web search, and others are not supported yet. For usage, refer to the official documentation.

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Using Claude Code

See Third-Party Tool Configuration - Claude Code.