AI Model Watch
Models / OpenAI

GPT-5.6 Luna

GA

Fast, cost-efficient 'Luna' tier of the GPT-5.6 family — built for high-volume tasks. GA on the API + Codex 2026-07-09. Text+image input, text output, full 1.05M context. PRICE CORRECTED 2026-08-08: we published $1.00/$0.10/$6.00 — 5x high on all three — against $0.20/$0.02/$1.20 stated on developers.openai.com/api/docs/pricing (Standard tier) and on the model page. Cache write $0.25/M. Prompts >272K input tokens are billed at 2x input / 1.5x output for the whole request (stated on the model page). Batch ~50% ($0.10/$0.01/$0.60).

GPT-5.6 Luna by OpenAI costs $0.2 per 1M input tokens and $1.20 per 1M output tokens ($0.45/1M blended), with a 1.1M (1.050.000-token) context window. It is generally available (GA), with a knowledge cutoff of 16 Feb 2026.

Last verified: 13 Aug 2026 · sourced from official provider documentation

Provider
OpenAI
Status
GA
Input price
$0.2 / 1M tokens
Output price
$1.20 / 1M tokens
Cached input
$0.02 / 1M tokens
Blended price
$0.45 / 1M tokens
Context window
1.050.000 tokens (1.1M)
Max output
128.000 tokens
Modality
text, image
Open weights
No — API only
Knowledge cutoff
2026-02-16
Released
9 Jul 2026
API string
gpt-5.6-luna

Source: OpenAI official documentation ↗

See also

Compare GPT-5.6 Luna head-to-head

GPT-5.6 Luna vs GPT-5.6 Cyber→

$0.45 vs $28.13 blended /M · same family

GPT-5.6 Luna vs GPT-5.6 Sol→

$0.45 vs $11.25 blended /M · same family

GPT-5.6 Luna vs GPT-5.6 Terra→

$0.45 vs $4.50 blended /M · same family

FAQ

GPT-5.6 Luna — questions & answers

How much does GPT-5.6 Luna cost?

GPT-5.6 Luna is priced at $0.2 per 1M input tokens and $1.20 per 1M output tokens ($0.45/1M blended at a 3:1 input-to-output ratio), with cached input at $0.02 per 1M tokens.

What is the context window of GPT-5.6 Luna?

GPT-5.6 Luna has a 1.050.000-token context window (1.1M), with up to 128.000 output tokens per request.

Is GPT-5.6 Luna deprecated?

No — GPT-5.6 Luna is generally available (GA) and not currently scheduled for deprecation or retirement in our tracker.

Does GPT-5.6 Luna support image or vision input?

Yes — GPT-5.6 Luna accepts image input. Listed modalities: text, image.

Can I self-host GPT-5.6 Luna?

No — GPT-5.6 Luna is proprietary. Its weights are not publicly released, so it is available only through OpenAI's API (or hosted partners), not for self-hosting.

What is the API model string for GPT-5.6 Luna?

The API model identifier for GPT-5.6 Luna is "gpt-5.6-luna" when calling OpenAI's API.

What is GPT-5.6 Luna's knowledge cutoff?

GPT-5.6 Luna's training knowledge cutoff is 16 Feb 2026.