GPT-5.6 Luna

Jul 2026
GPT-5.6 Luna
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$0.18per task?
$0.20 / $1.20per 1M in / outcache $0.02
178 tok/sfirst token in 82 s?
1.05Mcontext

Rankingat max effort?

Alternatives?

History

2 versions
293031Release dateChartography5.66
293031Release dateChartography5.66

Benchmarks

all categories
Chat & Knowledge
MLCR-AA19.4#24
HealthBench Professional length-adjustedlab55.7
HealthBench length-adjustedlab55.8
HealthBench Hard length-adjustedlab32
HealthBench Consensus length-adjustedlab95.1
Coding
SciCode53.6#36
SWE-bench Pro (public)lab62.7
SWE-bench Pro (edition unstated)lab62.7
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 $0.18 at max 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?›

#47 of 334 in Chat & Knowledge, #37 of 132 in Coding, #35 of 133 in Agents & Tool Use, #56 of 195 in Writing & Language, #29 of 124 in Vision & Documents. Strongest at: Agents & work tasks, Reasoning, Science, Long context, Vision.

Is GPT-5.6 Luna better than Muse Spark 1.2?›

On Chartography, GPT-5.6 Luna scores 31.4 vs 32.1 — about the same. It is 82% cheaper per task.

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 It has been superseded by GPT-6 Luna.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 Kimi K3.

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?›

GPT-6 Luna (cheaper), GPT-6 Sol (better), Kimi K3 (open weights).