GPT-5.6 Luna
GPT-5.6 LunaAlternatives?
CheaperGPT-6 Lunanon-thinking×3-27%$0.011Function calling only with none · Chat Completions+3
OpenGLM 5.3max×83+12,758%$2.01Context: 1.05M → 1M+5Lower effortSame modelnon-thinkingsame-35%$0.01
CheaperLing 3.0 FlashthinkingOpensame-80%$0.06 / $0.18Context: 1.05M → 262K+1CheaperLing 3.0 Flash VLthinkingOpensame-80%$0.06 / $0.18Context: 1.05M → 262KGPT-6 Lunanon-thinking×3-27%$0.011Function calling only with none · Chat Completions+3Ling 3.0 FlashthinkingOpensame-80%$0.06 / $0.18Context: 1.05M → 262K+1Ling 3.0 Flash VLthinkingOpensame-80%$0.06 / $0.18Context: 1.05M → 262KLing 3.0 Flash FinthinkingOpensame-80%$0.06 / $0.18Context: 1.05M → 262K+1
Gemma 4 31BthinkingOpensame-64%$0.10 / $0.34Context: 1.05M → 256KGPT-6 Lunamedium×5+12%$0.017Function calling only with none · Chat Completions+3
Claude Haiku 5.5low×25+57%$0.024Context: 1.05M → 1M+6
MiMo v2.6 FlashthinkingOpen×45+300%$0.062Context: 1.05M → 1M+4GPT-6.1 Sollow×61+738%$0.13Remove unsupported parameters+5GPT-6 Sollow×18+751%$0.13GLM 5.3maxOpen×83+12,758%$2.01Context: 1.05M → 1M+5MiMo v2.6 ProthinkingOpen×69+754%$0.13Context: 1.05M → 1M+4
DeepSeek V4.1 Flash 1017maxOpen×67+1,580%$0.26Context: 1.05M → 1M+5Ling 3.1 FlashOpen×66+6,309%$1.00Context: 1.05M → 1M+1
Step 5 PreviewthinkingOpen×66+6,480%$1.03Context: 1.05M → 1M+3GPT-6 Astramedium×98+9,777%$1.54Monitoring can return HTTP 403+2GPT-6.1 Solmedium×95+1,270%$0.21Remove unsupported parameters+5GPT-6 Solmedium×37+1,485%$0.25GPT-5.6 Solmedium×29+3,138%$0.50GPT-5.5 Instant (June 2026)×25+4,333%$0.69Context: 1.05M → 400KGPT-5.5medium×10+5,681%$0.90Prompts with >272K input tokensGPT-6 Lunamedium×5+12%$0.017Function calling only with none · Chat Completions+3GPT-5.4 Minixhigh×4+2,768%$0.45Context: 1.05M → 400KAll OpenAI models →History
2 versionsBenchmarks
in CodingFAQ
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 $0.016 at medium 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?›
#98 of 334 in Chat & Knowledge, #62 of 132 in Coding, #55 of 133 in Agents & Tool Use, #56 of 195 in Writing & Language, #41 of 124 in Vision & Documents. Strongest at: Science.
Is GPT-5.6 Luna better than GPT-5.5 Instant (June 2026)?›
On Terminal-Bench 4.0, GPT-5.6 Luna scores 11.6 vs 12.6 — lower. 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 GLM 5.3.
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), GLM 5.3 (open weights).