GPT-5.6 Luna
GPT-5.6 LunaAlternatives?
CheaperGPT-6 Lunamax-4%-62%$0.068Function calling only with none · Chat Completions+3BetterGPT-6.1 Solmax+14%+306%$0.72Remove unsupported parameters+5
OpenKimi K3max-12%+1,022%$2.00Context: 1.05M → 1M+4Lower effortSame modellow-50%-94%$0.01BetterGPT-6 Solmax+9%+486%$1.04GPT-6 Lunamax-4%-62%$0.068Function calling only with none · Chat Completions+3GPT-6.1 Solmax+14%+306%$0.72Remove unsupported parameters+5GPT-6 Solmax+9%+486%$1.04GPT-5.6 Terramax+5%+684%$1.40Prompts with >272K input tokensGPT-5.6 Solmax+9%+1,015%$1.99
Gemini 4 Argonhigh+5%+1,016%*$1.99Context: 1.05M → 1M+3Kimi K3maxOpen-12%+1,022%$2.00Context: 1.05M → 1M+4
GLM 5.3maxOpen-16%+1,025%$2.01Context: 1.05M → 1M+5
DeepSeek V4 Pro 0813maxOpen-21%+278%$0.67Context: 1.05M → 1M+6GLM 5.2maxOpen-28%+726%$1.47Context: 1.05M → 1M+1Kimi K2.6unstatedOpen-30%+281%$0.95 / $4Context: 1.05M → 256KGPT-6.1 Solmax+14%+306%$0.72Remove unsupported parameters+5GPT-6 Astramax+14%+1,727%$3.26Monitoring can return HTTP 403+2GPT-6 Solmax+9%+486%$1.04GPT-5.6 Solmax+9%+1,015%$1.99GPT-5.5 Proxhigh+7%—$30 / $180GPT-5.6 Terramax+5%+684%$1.40Prompts with >272K input tokensGPT-5.5xhigh+4%+1,377%$2.63Prompts with >272K input tokensGPT-5.4 Pro (2026-03-05)same—$30 / $180No strict JSONAll OpenAI models →History
2 versionsBenchmarks
in Chat & KnowledgeFAQ
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 Wonder?›
On FrontierMath Tiers 1–3 (v2), GPT-5.6 Luna scores 82.1 vs 82.1 — about the same.
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 It has been superseded by GPT-6 Luna.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-6.1 Sol (better), Kimi K3 (open weights).