GPT-5.6 Luna
GPT-5.6 LunaAlternatives?
CheaperAgnes 2.5 Pro Beta+12%-67%$0.10 / $0.30Context: 1.05M → 1M
BetterMiMo v2.5 ProthinkingOpen+7%+23%$0.054Context: 1.05M → 1M+1OpenMiMo v2.6 Prothinking+48%+203%$0.13Context: 1.05M → 1M+4Lower effortSame modelmedium-23%-65%$0.016CheaperGPT-6 Lunahighsame-34%$0.029Function calling only with none · Chat Completions+3Agnes 2.5 Pro Beta+12%-67%$0.10 / $0.30Context: 1.05M → 1MGPT-6 Lunahighsame-34%$0.029Function calling only with none · Chat Completions+3
Hy3 previewthinkingOpen-17%-37%$0.18 / $0.60Context: 1.05M → 256K+2MiMo v2.5thinkingOpen-19%-57%$0.019Context: 1.05M → 1M
Claude Haiku 5.5low-19%-44%$0.024Context: 1.05M → 1M+6MiMo v2.5 ProthinkingOpen+7%+23%$0.054Context: 1.05M → 1M+1GPT-6 Lunamax+15%+54%$0.068Function calling only with none · Chat Completions+3Claude Haiku 5.5high+12%+81%$0.079Context: 1.05M → 1M+6GPT-6.1 Sollow+42%+197%$0.13Remove unsupported parameters+5MiMo v2.6 ProthinkingOpen+48%+203%$0.13Context: 1.05M → 1M+4MiMo v2.6 ProthinkingOpen+48%+203%$0.13Context: 1.05M → 1M+4
Kimi K3maxOpen+40%+4,448%$2.00Context: 1.05M → 1M+4
Step 5 PreviewthinkingOpen+39%+2,234%$1.03Context: 1.05M → 1M+3
Muse Spark OpenxhighOpen+31%+1,818%$0.84Context: 1.05M → 1M+2
DeepSeek V4.1 Flash 1017maxOpen+30%+496%$0.26Context: 1.05M → 1M+5GPT-6 Astrahigh+59%+3,823%$1.73Monitoring can return HTTP 403+2GPT-6.1 Solhigh+54%+626%$0.32Remove unsupported parameters+5GPT-5.6 Solhigh+38%+1,737%$0.81GPT-5.5high+35%+3,404%$1.54Prompts with >272K input tokensGPT-6 Solhigh+32%+748%$0.37GPT-5.3 Codexxhigh+27%—$1.75 / $14Context: 1.05M → 400K+1GPT-5.6 Terrahigh+15%+668%$0.34Prompts with >272K input tokensGPT-6 Lunahighsame-34%$0.029Function calling only with none · Chat Completions+3All 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 $0.044 at high 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?›
#71 of 334 in Chat & Knowledge, #48 of 132 in Coding, #47 of 133 in Agents & Tool Use, #56 of 195 in Writing & Language, #35 of 124 in Vision & Documents. Strongest at: Reasoning, Science, Long context.
Is GPT-5.6 Luna better than GPT-4.1 Nano?›
On Humanity's Last Exam, GPT-5.6 Luna scores 39.5 vs 3.8 — 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 MiMo v2.6 Pro.
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?›
Agnes 2.5 Pro Beta (cheaper), MiMo v2.5 Pro (better), MiMo v2.6 Pro (open weights).