GPT-5.6 Luna

Jul 2026
GPT-5.6 Luna
Compare in
on
$0.016per task?
$0.20 / $1.20per 1M in / outcache $0.02
113 tok/sfirst token in 2.2 s?
1.05Mcontext

Rankingat medium effort?

Alternatives?

History

2 versions
59.359.459.5Release dateARC-AGI-2 · Semi-private5.66
59.359.459.5Release dateARC-AGI-2 · Semi-private5.66

Benchmarks

all categories
Chat & Knowledge
MLCR-AA13.3#41
HealthBench Professional length-adjustedlab55.7
HealthBench length-adjustedlab55.8
HealthBench Hard length-adjustedlab32
HealthBench Consensus length-adjustedlab95.1
Coding
SciCode46.8#68
SWE-bench Pro (public)lab62.7
SWE-bench Pro (edition unstated)lab62.7
SWE-rebench · all · May 15, 2026 to July 1, 202643.6#6
SWE-rebench · Go · May 15, 2026 to July 1, 202654.3#6
SWE-rebench · Java · May 15, 2026 to July 1, 202641.9#6
SWE-rebench · Rust · May 15, 2026 to July 1, 202632.8#6
SWE-rebench · Python · May 15, 2026 to July 1, 202637#6
SWE-rebench · TypeScript · May 15, 2026 to July 1, 202652.5#6
Agents & Tool Use
Vision & Documents

FAQ

How much does GPT-5.6 Luna cost?›

$0.20 per 1M input tokens and $1.20 per 1M output tokens; cached input $0.02 per 1M. A typical benchmark task costs about $0.016 at medium effort.

Is GPT-5.6 Luna free to use?›

There is no free API; the cheapest paid price is $0.20 per 1M input tokens.

How good is GPT-5.6 Luna, and what is it best at?›

#100 of 336 in Chat & Knowledge, #64 of 134 in Coding, #57 of 135 in Agents & Tool Use, #68 of 197 in Writing & Language, #42 of 125 in Vision & Documents. Strongest at: Science.

Is GPT-5.6 Luna better than GPT-4.1 Nano?›

On ARC-AGI-2 · semi-private, GPT-5.6 Luna scores 59.5 vs 0 — higher.

How can I use GPT-5.6 Luna?›

Through the API of Amazon Bedrock, Azure, OpenAI.

What is the context window of GPT-5.6 Luna?›

1.05M tokens, with up to 128K output tokens.

When was GPT-5.6 Luna released? Is there a newer version?›

Released 2026-07-09. It has been superseded by GPT-6 Luna.

Is GPT-5.6 Luna open source?›

No, GPT-5.6 Luna is a closed model available through an API. The closest open-weights option here is DeepSeek V4.1 Flash 1017.

Can GPT-5.6 Luna read images?›

It accepts text and images, PDF files as input.

What is GPT-5.6 Luna?›

GPT-5.6 Luna is a closed language model from OpenAI, released Jul 2026, the successor to GPT-4.1 Nano.

What are the best alternatives to GPT-5.6 Luna?›

GLM 5.3 Flash (cheaper), GPT-6 Luna (better), DeepSeek V4.1 Flash 1017 (open weights).