GPT-5.6 Luna
GPT-5.6 Luna is OpenAI's cheap variant released July 30, 2026. At $0.20/$1.20 per 1M tokens, it's 12x cheaper than standard GPT-5.6 while retaining 90% of its capability. The cost was cut 80% in July 2026 from $1/$6 to $0.20/$1.20.
Best For
Strengths
- Dramatically cheaper than standard GPT-5.6 (12x lower)
- Same 90% capability on most tasks
- Faster than standard GPT-5.6
- Ideal for high-volume production use
- Same multimodal input as standard
Weaknesses
- Weaker on very hard reasoning
- 256K context (vs 1M for standard)
- Less consistent on edge cases
- No video understanding
Related Alternatives
DeepSeek V4 Flash
Almost the same price, open-source
Gemini 3.6 Flash
Multimodal + fast, $1.50/$7.50 per 1M
Frequently Asked Questions
How much does GPT-5.6 Luna cost?
GPT-5.6 Luna costs $0.20 per 1M input tokens and $1.20 per 1M output tokens as of August 2026. The price was cut 80% in July 2026. It's now cheaper than DeepSeek V4 Pro for most workloads.
Is GPT-5.6 Luna as good as GPT-5.6 standard?
About 90% as capable. On routine tasks (translation, summarization, code completion, content generation), it's nearly indistinguishable. On hard math, agent tasks, and edge cases, standard GPT-5.6 still leads by 5-15%.
See GPT-5.6 Luna's full record in our database
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