OpenAI · 2026-09-22
GPT-6 Luna Pro pricing
GPT-6 Luna Pro is the same underlying model as GPT-6 Luna, served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks.
Prices from OpenRouter’s models API, updated October 29, 2026
What GPT-6 Luna Pro costs a month
| Workload | Standard | Batch API |
|---|---|---|
| Support chatbot: 1,000 chats a day, 1,500 tokens in, 400 out | $10.50 | $5.25 |
| Daily summaries: 10,000 a day, 3,000 tokens in, 300 out | $135 | $67.50 |
| Coding agent: 400 calls a day, 60,000 tokens in (80% cached), 2,000 out | $32.16 | $18.96 |
30 days. Cached input billed at the cache-read price. Use your own numbers.
Cheaper models with a similar context window
| Model | Provider | Input /1M | Output /1M | Cache read /1M | Context | Chatbot, per month* |
|---|---|---|---|---|---|---|
| GLM 5.3 Flash | Z.ai | $0.046 | $0.074 | $0.03 | 1.05M | $2.95 |
| Qwen3.7 Flash | Alibaba Qwen | $0.03 | $0.13 | $0.006 | 1M | $2.91 |
| Ling 3.0 Flash VL | inclusionai | $0.06 | $0.18 | $0.012 | 131K | $4.86 |
| Ternary Bonsai 2 9B | prism-ml | $0.08 | $0.13 | $0.04 | 262K | $5.16 |
| Qwen3.5-Flash | Alibaba Qwen | $0.065 | $0.26 | – | 1M | $6.04 |
* Support chatbot: 1,000 chats a day, 1,500 tokens in, 400 out, 30 days, no caching. Prices in US dollars per 1M tokens.
Cheaper isn’t automatically as good. Glow’s GlowBench scores models on your kind of task before suggesting a swap.
Other GPT models
| Model | Input /1M | Output /1M | Cache read /1M | Context | Chatbot, per month* |
|---|---|---|---|---|---|
| GPT-6.1 Terra | $1 | $5 | $0.05 | 1.05M | $105 |
| GPT-6.1 Terra Pro | $1 | $5 | $0.05 | 1.05M | $105 |
| GPT-6.1 Sol | $2 | $10 | $0.10 | 1.05M | $210 |
| GPT-6.1 Sol Pro | $2 | $10 | $0.10 | 1.05M | $210 |
| GPT-6 Luna | $0.10 | $0.50 | $0.01 | 1.05M | $10.50 |
| GPT-6 Sol | $2 | $10 | $0.20 | 1.05M | $210 |
* Support chatbot: 1,000 chats a day, 1,500 tokens in, 400 out, 30 days, no caching. Prices in US dollars per 1M tokens.
Related
GPT-6 Luna Pro: questions
How much does GPT-6 Luna Pro cost?
$0.10 per 1M input tokens and $0.50 per 1M output tokens, with cached input at $0.01, or $0.05 / $0.25 through the batch API. A 1,000-token prompt with a 500-token answer costs about $0.0003.
What is GPT-6 Luna Pro’s context window?
1,050,000 tokens, with up to 128,000 output tokens per response.
Is there a cheaper alternative to GPT-6 Luna Pro?
GLM 5.3 Flash costs $0.046 in and $0.074 out per 1M tokens with a similar context window. Whether it matches GPT-6 Luna Pro’s quality depends on the task: test it on your own prompts (Glow’s GlowBench does this per task).
Know what each model really costs you.
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