OpenAI: gpt-5.6-luna
gpt-5.6-luna
1.1M context128K outReasoningToolsParallel toolsVisionFilesCacheStructuredWeb searchStreamingSystem msg
Released Jul 9, 2026Knowledge cutoff 2026Updated Jul 9, 2026
GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for its price tier.
Mode chatTokenizer GPTReasoning levels none, low, medium, high, maxModerated
Pricing
Input price
$0.03/ 1M tokens$1.0098% off
Output price
$0.15/ 1M tokens$6.0098% off
Compatible endpoints openai, anthropicVendor OpenAI
Performance
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Usage & Ranking
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Supported parameters
All providers = every upstream serving this model supports it. Some providers = depends on which upstream handles the request. Default = the value sent when you leave the parameter unset.
| Parameter | Providers | Default |
|---|---|---|
| frequency_penalty | Some providers | Not sent by default |
| include_reasoning | All providers | - |
| max_completion_tokens | Some providers | - |
| max_tokens | Some providers | - |
| presence_penalty | Some providers | Not sent by default |
| reasoning | All providers | - |
| reasoning_effort | All providers | - |
| repetition_penalty | Some providers | Not sent by default |
| response_format | All providers | - |
| seed | All providers | - |
| structured_outputs | All providers | - |
| temperature | Some providers | Not sent by default |
| tool_choice | All providers | - |
| tools | All providers | - |
| top_k | Some providers | Not sent by default |
| top_p | Some providers | Not sent by default |
