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GPT-5.6 Luna
gpt-5.6-luna is the fast, cost-efficient GPT-5.6 tier for chat, classification, and lightweight agents. Send it OpenAI-compatible chat requests through SnapGen with one API key.

Price per 1M tokens

Confirm live rates on the GPT-5 model page before production rollout.
string
required
Set to gpt-5.6-luna.
array
required
Ordered system, user, and assistant messages.
boolean
default:"false"
Set to true to receive server-sent events. Include stream_options: { "include_usage": true } to request usage in the stream.
integer
Caps generated tokens, including reasoning. If you send max_tokens instead, the gateway forwards it as max_completion_tokens; when both are present, max_completion_tokens wins.

Request (curl)

Streaming example:
Responses API example:
For Chat Completions, read choices[0].message.content. For Responses, read output[].content[] items whose type is output_text, or the SDK output_text helper. See Chat Completions and Responses for streaming, function tools, and response fields.

Supported protocols

SnapGen forwards each protocol only to routes that serve it natively; it does not translate between protocols. Billing uses the input, output, and cached token counts the provider reports.