OpenAI

GPT-5.6 Luna

CTX1.05M

91Quality

Reasoning · Vision · Tools

Input$0.20/M

Output$1.20/M

Cost-efficient GPT-5.6 model for fast, high-volume workloads

PaidProprietary945/1044

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OpenAITextCommon

GPT-5.6 Luna

Cost-efficient GPT-5.6 model for fast, high-volume workloads

gpt-5.6-luna

Type: Text
Quality: 91 · Top 9% on the Epoch Capabilities Index
Context window: 1,050,000 tokens
Max output: 128,000 tokens
Input price: $0.20 / 1M tokens
Output price: $1.20 / 1M tokens
Cache read: $0.02 / 1M tokens
Cache write: $0.25 / 1M tokens
Released: Jul 9, 2026
Knowledge cutoff: Feb 2026
Takes in: Text, Image, PDF
Puts out: Text
Reasoning: Yes
Tool calling: Yes
Structured output: Yes
File attachments: Yes
Access: Paid
License: Proprietary
Rarity: Common
Set number: 945/1044

Open OpenAI docs Quality 91 Where to run it 46 Evolution 1/2 Meet its creature Battle Solar Pro 4

Weights aren’t public. Use is governed by OpenAI’s terms. Specs from models.dev, last changed Oct 19, 2026. Official source: platform.openai.com.

How good is it?

Public leaderboard scores for GPT-5.6 Luna, refreshed daily from Epoch AI and LMArena.

Top 9% of the 277 models on the Epoch Capabilities Index: #25.

Quality is the share of a leaderboard’s models this one beats, from 0 to 100. Chat models are rated on Epoch AI’s Capabilities Index when it lists them, otherwise on LMArena; image and video models on LMArena’s image and video arenas.

Leaderboards

Epoch Capabilities Index#25 of 277
One number fitted from dozens of hard benchmarks, from science questions to agentic coding.156.3 index
LMArena Text#93 of 416
People compare two anonymous answers and vote for the better one.1,431 rating
Listed as gpt-5.6-luna-xhigh
LMArena Text · Coding#76 of 411
The text arena’s coding prompts only.1,466 rating
Listed as gpt-5.6-luna-xhigh
LMArena Text · Math#58 of 400
The text arena’s math prompts only.1,459 rating
Listed as gpt-5.6-luna-xhigh
LMArena Text · Creative writing#107 of 414
The text arena’s creative writing prompts only.1,396 rating
Listed as gpt-5.6-luna-xhigh
LMArena WebDev#54 of 145
Each model builds a web app from the same prompt; people pick the better one.1,519 rating
Listed as GPT-5.6 Luna (xHigh, Codex Harness)
LMArena Vision#58 of 165
Questions about images, voted by people.1,258 rating
Listed as gpt-5.6-luna-xhigh

Benchmarks Epoch AI runs

Scores from Epoch AI and LMArena, licensed CC BY 4.0. Boards list models under their own names, so a close match is shown with the name it was scored under. Credits

Where to run it

46 providers sell GPT-5.6 Luna through an API. Prices are per million tokens, cheapest first.

CheapestBothub$0.06 in · $0.37 out
Free to try1 providerKenari
From the labOpenAI$0.20 in · $1.20 out

API providers

Provider	Input	Output	Context
KenariFree`gpt-5-6-luna`	Free	Free	1.05M
BothubCheapest paid`gpt-5.6-luna`	$0.06	$0.37	1.05M
302.AI`gpt-5.6-luna`	$0.20	$1.20	1.05M
Aixy`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
Amazon Bedrock`global.openai.gpt-5.6-luna`	$0.20	$1.20	1.05M
Azure`gpt-5.6-luna`	$0.20	$1.20	1.05M
Boundless`gpt-5.6-luna`	$0.20	$1.20	262K
Cloudflare AI Gateway`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
CommandCode`gpt-5.6-luna`	$0.20	$1.20	1.05M
CrossModel`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M

Show 36 more providers

Provider	Input	Output	Context
DevPass (LLM Gateway)`gpt-5.6-luna`	$0.20	$1.20	1.05M
Eden AI`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
GitHub Copilot`gpt-5.6-luna`	$0.20	$1.20	1.05M
Impossibl`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
Kilo Gateway`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
LLM Gateway`azure/gpt-5.6-luna`	$0.20	$1.20	1.05M
LowRouter`auto/openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
Merge Gateway`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
NanoGPT`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
NEAR AI Cloud`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
Neon`gpt-5-6-luna`	$0.20	$1.20	1.05M
Ofox`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
OpenAIOfficial`gpt-5.6-luna`	$0.20	$1.20	1.05M
OpenCode`gpt-5.6-luna`	$0.20	$1.20	1.05M
OpenCode Go`gpt-5.6-luna`	$0.20	$1.20	1.05M
OpenRouter`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
Opper`gpt-5.6-luna`	$0.20	$1.20	1M
OrcaRouter`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
Prime Inference`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
Requesty`gpt-5.6-luna`	$0.20	$1.20	1.05M
Standard Compute`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
Venice AI`openai-gpt-56-luna`	$0.20	$1.20	1M
Vercel AI Gateway`openai/gpt-5.6-luna`	$0.20	$1.20	1.05M
Cortecs`gpt-5.6-luna`	$0.22	$1.32	1.05M
AI/ML API`openai/gpt-5.6-luna`	$0.26	$1.56	1.05M
routing.run`gpt-5.6-luna`	$0.70	$4.20	1M
Abacus`gpt-5.6-luna`	$1.00	$6.00	1M
AI-ROUTER`gpt-5.6-luna`	$1.00	$6.00	1.05M
AIHubMix`gpt-5.6-luna`	$1.00	$6.00	1.05M
Azure Cognitive Services`gpt-5.6-luna`	$1.00	$6.00	1.05M
Databricks`databricks-gpt-5-6-luna`	$1.00	$6.00	400K
Pioneer`gpt-5.6-luna`	$1.00	$6.00	1.05M
SAP AI Core`gpt-5.6-luna`	$1.00	$6.00	1.05M
Vivgrid`gpt-5.6-luna`	$1.00	$6.00	1.05M
ZenMux`openai/gpt-5.6-luna`	$1.00	$6.00	1.05M
Snowflake Cortex`openai-gpt-5.6-luna`	—	—	1.05M

From models.dev and Hugging Face, checked daily. Resellers’ listings can lag behind their price pages, so confirm with the provider before you commit.

Face off

Current text models from other labs at a similar output price.

GPT-5.6 Luna

GPT-5.6 Luna

How good is it?

Leaderboards

Benchmarks Epoch AI runs

Where to run it

API providers

Face off

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