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AnyFast is fully compatible with the OpenAI Chat Completions API. If you’re already using the OpenAI SDK, switching to AnyFast requires only a base URL change — no code rewrite needed.

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Endpoint

POST https://www.anyfast.ai/v1/chat/completions

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Authentication

Include your AnyFast API key as a Bearer token: 
Authorization: Bearer YOUR_API_KEY

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Quick example

curl https://www.anyfast.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'

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Supported models

ProviderModels
Anthropicclaude-sonnet-4-6, claude-sonnet-4-5-20250929, claude-sonnet-4-20250514, claude-opus-4-6, claude-opus-4-5-20251101, claude-opus-4-1-20250805, claude-opus-4-20250514, claude-haiku-4-5-20251001, claude-3-7-sonnet-20250219, claude-3-5-sonnet-20241022
OpenAIgpt-5-4, gpt-5-3-codex, gpt-5-2, gpt-5-1, gpt-5, gpt-5-pro, gpt-5-mini, gpt-5-nano, gpt-4o, gpt-4o-mini, gpt-4-1, gpt-4
DeepSeekdeepseek-v3-2-speciale, deepseek-v3-2, deepseek-v3-1-terminus, deepseek-v3-1, deepseek-v3
Alibabaqwen3.5-397b-a17b, qwen3-coder-next, qwen3-coder, qwen3-235b-a22b, qwen3-32b, qwen3-14b, qwen2.5-72b-instruct
ByteDancedoubao-seed-2.0-pro, doubao-seed-2.0-code, doubao-seed-2.0-lite, doubao-seed-2.0-mini, doubao-seed-1-8-251228, doubao-seed-1-6-flash-250828, doubao-seed-1-6-251015, doubao-seed-1-6-lite-251015, doubao-seed-1-6-vision-250815, glm-4-7-251222
MiniMaxminimax-m2.5, minimax-m2.1
MoonShotkimi-k2.5
xAIgrok-3, grok-3-mini, grok-4-fast-reasoning, grok-4-fast-non-reasoning, grok-4-1-fast-reasoning, grok-4-1-fast-non-reasoning
Googlegemini-3.1-pro-preview, gemini-3-pro-preview, gemini-3-flash-preview, gemini-2.5-pro, gemini-2.5-flash, gemini-2.0-flash

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Features

  • Streaming — Set stream: true for real-time token streaming via SSE
  • Function calling — Use the tools and tool_choice parameters
  • JSON mode — Set response_format: { type: "json_object" }
  • Multi-turn conversations — Include full message history in messages