GPT-5.6 Luna

Released July 9, 2026 with the GPT-5.6 family. Luna is the fast, low-cost tier for high-volume workloads, with a ~1.05M-token context and 128K max output.

GPT-5.6 Luna strengths

• Fast and inexpensive for high-volume work
• Solid quality for classification, extraction and chat
• ~1.05M context / 128K max output
• Multimodal (text + image)
• Lowest-latency tier of the GPT-5.6 family

Pricing & context

Cost guide: a typical call of about 10K input + 2K output tokens costs roughly $0.022 at list prices. Worth modelling against cheaper tiers before committing high-volume traffic.

When to choose GPT-5.6 Luna

GPT-5.6 Luna is best for high-volume tasks like classification, extraction and chat where cost and speed matter most. For higher quality, step up to GPT-5.6 Terra.

GPT-5.6 Luna FAQ

How much does GPT-5.6 Luna cost?

GPT-5.6 Luna is priced at $1.00 per 1M input tokens and $6.00 per 1M output tokens (public API list price), with a ~1.05M-token context window. A typical 10K-input / 2K-output call costs roughly $0.022.

What is GPT-5.6 Luna best for?

GPT-5.6 Luna by OpenAI is best for high-volume tasks like classification, extraction and chat where cost and speed matter most.

How does GPT-5.6 Luna compare to GPT-5.6 Terra?

Luna is the cheapest, fastest GPT-5.6 tier ($1 / $6) for high-volume work; Terra ($2.50 / $15) offers higher quality for more demanding production tasks.

Is GPT-5.6 Luna multimodal?

Yes. GPT-5.6 Luna supports text and image input.

Tools that use GPT-5.6 Luna