What does GPT-5.6 Luna cost?

GPT-5.6 Luna is priced at $1.2 output and $0.2 input (USD per 1M tokens)

How large is the context window of GPT-5.6 Luna?

GPT-5.6 Luna has a 1.1M Tokens context window with up to 128K Tokens output.

Where can I access GPT-5.6 Luna?

Official channels: Website and API platform.

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OpenAI

GPT-5.6 Luna

BClosed

A new-generation model family released by OpenAI on July 9, 2026, in three tiers: the flagship Sol, the mainline Terra, and the lightweight Luna. Luna is designed for low cost and high throughput, with about 62% fewer factual errors than GPT-5.5 Instant. Permanent price cuts take effect from July 30: Luna down 80%, Terra down 20%; Sol adds a Fast mode (double the price, 2.5x the speed).

API Pricing

Input

$0.2

Output

$1.2

Cached input

—

Peak hours

—

USD / 1M tokens

※ Luna pricing; permanent cuts from July 30: Terra $2/$12 (-20%), Luna $0.2/$1.2 (-80%); Sol Fast mode 2x price for 2.5x speed

Price sourceopenrouter.ai ↗developers.openai.com ↗

No price change in the last two snapshots

Price history

12 snapshots · 2026-04-28 → 2026-08-17

Current: $0.6Period low: $0.6 (2026-04-28)Period high: $0.6 (2026-04-28)First tracked: $0.6 (2026-04-28)

Specifications

Context window: 1.1M Tokens
Max output: 128K Tokens
Input modalities: text · image · audio
License: Closed

Overall score

Total

54.3

Rank

#15

Tier

Data confidence

85%

Capability43

Scale35

Value85

Context75.7

Ecosystem43.5

Freshness47.8

Capabilities & use cases

Artificial Analysis Luna beats DeepSeek V4-Pro on cost-efficiency

Key capabilities

Three-tier lineup (Sol/Terra/Luna)
Sol Fast mode
Deep reasoning

Best for

Batch text processing
High-throughput agents
Enterprise-grade agents

Official links

Website ↗API platform ↗Pricing page ↗Open in comparator ↗

Same vendor

GPT-6.1 Sol GPT-6 Astra GPT-5.6 Sol GPT-6 Luna GPT-5.6 Terra GPT-5 Nano

FAQ

What does GPT-5.6 Luna cost?: GPT-5.6 Luna is priced at $1.2 output and $0.2 input (USD per 1M tokens)
How large is the context window of GPT-5.6 Luna?: GPT-5.6 Luna has a 1.1M Tokens context window with up to 128K Tokens output.
Where can I access GPT-5.6 Luna?: Official channels: Website and API platform.

Data is refreshed daily and cross-checked against two independent sources; please confirm pricing and specs on the vendor page.