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MGModel Gate
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Messages

Request structures for Anthropic and OpenAI modes.

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Model Gate preserves the compatible Anthropic Messages and OpenAI Chat Completions request formats.

Anthropic Messages

{"model":"claude-opus-4.8","max_tokens":1024,"messages":[{"role":"user","content":"Hello"}]}

The endpoint also supports system prompts, thinking, tools, vision blocks, and prompt caching when supported by the model.

OpenAI Chat Completions

{"model":"claude-opus-4.8","messages":[{"role":"system","content":"You are a coding assistant."},{"role":"user","content":"Hello"}],"temperature":0.7,"max_tokens":1024}

Tool calling uses the standard OpenAI tools array. For streaming, see Streaming. To estimate Anthropic input size, use count_tokens.