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OpenAI: GPT-6 Luna Pro API Pricing
GPT-6 Luna Pro is the same underlying model as [GPT-6 Luna](https://openrouter.ai/openai/gpt-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-6 Luna Pro cost for a real workload?
At 10M input + 2M output tokens per month, OpenAI: GPT-6 Luna Pro costs about $2 ($1 input + $1 output). Try your own volumes in the cost calculator.
What are cheaper alternatives to OpenAI: GPT-6 Luna Pro?
- PrismML: Ternary Bonsai 2 27B — $0.075 in / $0.5 out per 1M
- NVIDIA: Nemotron 3 Super — $0.08 in / $0.45 out per 1M
- ByteDance Seed: Seed-2.0-Mini — $0.1 in / $0.4 out per 1M
- Google: Gemini 2.5 Flash Lite — $0.1 in / $0.4 out per 1M
- OpenAI: GPT-4.1 Nano — $0.1 in / $0.4 out per 1M
- Z.ai: GLM 4.7 Flash — $0.0605 in / $0.4 out per 1M
Compare OpenAI: GPT-6 Luna Pro with other models
OpenAI: GPT-6 Luna Pro vs OpenAI: gpt-oss-20bOpenAI: GPT-6 Luna Pro vs OpenAI: gpt-oss-20b (batch)OpenAI: GPT-6 Luna Pro vs OpenAI: gpt-oss-120b (batch)OpenAI: GPT-6 Luna Pro vs OpenAI: GPT-5 Nano (batch)OpenAI: GPT-6 Luna Pro vs OpenAI: GPT-4.1 Nano (batch)OpenAI: GPT-6 Luna Pro vs OpenAI: GPT-6 Luna Pro (batch)
Frequently asked questions
How much does OpenAI: GPT-6 Luna Pro cost?
OpenAI: GPT-6 Luna Pro costs $0.1 per 1M input tokens and $0.5 per 1M output tokens (list price, snapshot October 21, 2026). At 10M input + 2M output tokens per month that is about $2.
What is the context window of OpenAI: GPT-6 Luna Pro?
OpenAI: GPT-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-6 Luna Pro?
Cheaper models include PrismML: Ternary Bonsai 2 27B ($0.075 in / $0.5 out), NVIDIA: Nemotron 3 Super ($0.08 in / $0.45 out), ByteDance Seed: Seed-2.0-Mini ($0.1 in / $0.4 out). See the full list on this page.
Is OpenAI: GPT-6 Luna Pro free to use?
No. OpenAI: GPT-6 Luna Pro is a paid model at $0.1 input / $0.5 output per 1M tokens. 20 free models are listed on the free models page.
Provider: openai · Model ID: openai/gpt-6-luna-pro · Modality: text+image+file->text · Price snapshot October 21, 2026, refreshed daily. How we collect prices