GPT-5.6 Luna
GPT-5.6 LunaAlternatives?
CheaperGPT-6.1 Sollow+13%-27%$0.13Remove unsupported parameters+5
OpenKimi K3max-8%+1,022%$2.00Context: 1.05M → 1M+4Lower effortSame modelxhighsame-52%$0.085CheaperGPT-6 Sollowsame-26%$0.13CheaperGPT-6 Lunamax-5%-62%$0.068Function calling only with none · Chat Completions+3GPT-6.1 Sollow+13%-27%$0.13Remove unsupported parameters+5GPT-6 Sollowsame-26%$0.13GPT-6 Lunamax-5%-62%$0.068Function calling only with none · Chat Completions+3
MiMo v2.6 ProthinkingOpen-20%-25%$0.13Context: 1.05M → 1M+4
Claude Haiku 5.5xhigh-24%-31%$0.12Context: 1.05M → 1M+6GPT-6.1 Sollow+13%-27%$0.13Remove unsupported parameters+5GPT-5.6 Solmedium+9%+183%$0.50GPT-6 Astralow+27%+359%$0.82Monitoring can return HTTP 403+2
Muse Spark 1.3max+11%+800%$1.60Context: 1.05M → 1M+6Claude Opus 5.5high+20%+922%$1.82Context: 1.05M → 1M+6Kimi K3maxOpen-8%+1,022%$2.00Context: 1.05M → 1M+4MiMo v2.6 ProthinkingOpen-20%-25%$0.13Context: 1.05M → 1M+4Muse Spark OpenxhighOpen-22%+373%$0.84Context: 1.05M → 1M+2
DeepSeek V4.1 Flash 1017maxOpen-28%+47%$0.26Context: 1.05M → 1M+5
Qwen3.8 27BxhighOpen-32%+465%$1.01Context: 1.05M → 262K+5GPT-6.1 Solmax+29%+306%$0.72Remove unsupported parameters+5GPT-6 Astramax+29%+1,727%$3.26Monitoring can return HTTP 403+2GPT-5.6 Solmax+13%+1,015%$1.99GPT-6 Solmax+5%+486%$1.04GPT-5.6 Terramaxsame+684%$1.40Prompts with >272K input tokensGPT-6 Lunamax-5%-62%$0.068Function calling only with none · Chat Completions+3GPT-5.5medium-14%+406%$0.90Prompts with >272K input tokensGPT-5.5 Instant (June 2026)-16%+288%$0.69Context: 1.05M → 400KAll 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 Claude Fable 5?›
On GDP.pdf · AA all-pass, GPT-5.6 Luna scores 24 vs 24 — about the same. It is 98% 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-6.1 Sol (cheaper), Kimi K3 (open weights).