GPT-5.6 Luna Pro
openai/gpt-5.6-luna-proGPT-5.6 Luna Pro is the same GPT-5.6 Luna model, OpenAI's smallest GPT-5.6 tier, served in OpenAI's pro reasoning mode rather than as different weights. In pro mode the model performs more work on each request before returning a single final answer, which OpenAI says can improve reliability on difficult tasks at the expense of higher latency and token usage. Use it when Luna's speed tier is preferred but a particular request is hard; keep standard Luna for routine, high-volume traffic.
- Input price
- $0.20USD / 1M tokens
- Output price
- $1.20USD / 1M tokens
- Cache read
- $0.02USD / 1M tokens
- Cache write
- $0.25USD / 1M tokens
- Context window
- 1.1M
- Max output
- 128K
Specifications
- Input
- Text, image
- Output
- Text
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Choose either supported API with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/responses" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "openai/gpt-5.6-luna-pro",
"input": "Hello",
"max_output_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Questions
FAQ
How do I call OpenAI GPT-5.6 Luna Pro through SandBase?
Create a SandBase API key, then send requests with the model ID "openai/gpt-5.6-luna-pro" to Responses API (/v1/responses) or Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.
How much does OpenAI GPT-5.6 Luna Pro cost?
$0.20 per 1M input tokens and $1.20 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.
What is the context window of OpenAI GPT-5.6 Luna Pro?
1.1M tokens of context, with up to 128K output tokens per response.
Which features does OpenAI GPT-5.6 Luna Pro support?
OpenAI GPT-5.6 Luna Pro supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.
Do I need a separate OpenAI account?
No. One SandBase API key and balance gives you access to OpenAI GPT-5.6 Luna Pro and the other models in the catalog; you do not need to sign up with OpenAI separately.