GPT-5.6 Luna
GPT-5.6 LunaAlternatives?
CheaperGLM 5.3 FlashhighOpen+71%-47%$0.15 / $0.50Context: 1.05M → 1M+5BetterGPT-6 Lunahigh+7%-34%$0.029Function calling only with none · Chat Completions+3Lower effortSame modelmedium-75%-65%$0.016
BetterClaude Haiku 5.5xhigh×2.1+181%$0.12Context: 1.05M → 1M+6BetterGPT-6.1 Sollow×2.6+197%$0.13Remove unsupported parameters+5GLM 5.3 FlashhighOpen+71%-47%$0.15 / $0.50Context: 1.05M → 1M+5GPT-6 Lunahigh+7%-34%$0.029Function calling only with none · Chat Completions+3GPT-6 Lunahigh+7%-34%$0.029Function calling only with none · Chat Completions+3Claude Haiku 5.5xhigh×2.1+181%$0.12Context: 1.05M → 1M+6GPT-6.1 Sollow×2.6+197%$0.13Remove unsupported parameters+5GPT-6 Sollow+8%+202%$0.13GPT-5.6 Terramedium+28%+317%$0.18Prompts with >272K input tokensGLM 5.3 FlashmaxOpen×2.2+545%$0.28Context: 1.05M → 1M+5
DeepSeek V4 Pro 0813maxOpen×2.1+1,433%$0.67Context: 1.05M → 1M+6
Kimi K3maxOpen×2.1+4,448%$2.00Context: 1.05M → 1M+4
Qwen3.8 27BxhighOpen+45%+2,191%$1.01Context: 1.05M → 262K+5TInkling SmallxhighOpen+37%+42%$0.45 / $1.20Context: 1.05M → 256K+1GPT-6 Astrahigh×3.1+3,823%$1.73Monitoring can return HTTP 403+2GPT-6.1 Solhigh×3.1+626%$0.32Remove unsupported parameters+5GPT-5.6 Solhigh×2.9+1,737%$0.81GPT-5.5 Prohigh×2.9—$30 / $180GPT-5.5high×2.8+3,404%$1.54Prompts with >272K input tokensGPT-5.4 Proxhigh×2.8—$30 / $180No strict JSONGPT-6 Solhigh×2.4+748%$0.37GPT-5.4high×2.3—$2.50 / $15All 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 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 It has been superseded by GPT-6 Luna.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 GLM 5.3 Flash.
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).