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OpenAI: GPT-5.6 Luna Pro API Pricing
GPT-5.6 Luna Pro is the same underlying model as [GPT-5.6 Luna](https://openrouter.ai/openai/gpt-5.6-luna), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
How much does OpenAI: GPT-5.6 Luna Pro cost for a real workload?
At 10M input + 2M output tokens per month, OpenAI: GPT-5.6 Luna Pro costs about $4.4 ($2 input + $2.4 output). Try your own volumes in the cost calculator.
What are cheaper alternatives to OpenAI: GPT-5.6 Luna Pro?
- Qwen: Qwen3.8 27B — $0.04 in / $1.35 out per 1M
- TheDrummer: Skyfall 36B V2 — $0.55 in / $0.8 out per 1M
- StepFun: Step 3.7 Flash — $0.2 in / $1.15 out per 1M
- Qwen: Qwen3 Next 80B A3B Thinking — $0.15 in / $1.2 out per 1M
- DeepSeek: DeepSeek V4 Pro 0423 — $0.4461 in / $0.8923 out per 1M
- Qwen: Qwen3.6 Flash — $0.1875 in / $1.125 out per 1M
Compare OpenAI: GPT-5.6 Luna Pro with other models
OpenAI: GPT-5.6 Luna Pro vs OpenAI: gpt-oss-20bOpenAI: GPT-5.6 Luna Pro vs OpenAI: gpt-oss-20b (batch)OpenAI: GPT-5.6 Luna Pro vs OpenAI: gpt-oss-120b (batch)OpenAI: GPT-5.6 Luna Pro vs OpenAI: GPT-5 Nano (batch)OpenAI: GPT-5.6 Luna Pro vs OpenAI: GPT-4.1 Nano (batch)OpenAI: GPT-5.6 Luna Pro vs OpenAI: GPT-6 Luna Pro (batch)
Frequently asked questions
How much does OpenAI: GPT-5.6 Luna Pro cost?
OpenAI: GPT-5.6 Luna Pro costs $0.2 per 1M input tokens and $1.2 per 1M output tokens (list price, snapshot October 21, 2026). At 10M input + 2M output tokens per month that is about $4.4.
What is the context window of OpenAI: GPT-5.6 Luna Pro?
OpenAI: GPT-5.6 Luna Pro has a context window of 1,050,000 tokens and can return up to 128,000 output tokens per response.
What are cheaper alternatives to OpenAI: GPT-5.6 Luna Pro?
Cheaper models include Qwen: Qwen3.8 27B ($0.04 in / $1.35 out), TheDrummer: Skyfall 36B V2 ($0.55 in / $0.8 out), StepFun: Step 3.7 Flash ($0.2 in / $1.15 out). See the full list on this page.
Is OpenAI: GPT-5.6 Luna Pro free to use?
No. OpenAI: GPT-5.6 Luna Pro is a paid model at $0.2 input / $1.2 output per 1M tokens. 20 free models are listed on the free models page.
Provider: openai · Model ID: openai/gpt-5.6-luna-pro · Modality: text+image+file->text · Price snapshot October 21, 2026, refreshed daily. How we collect prices