GPT-5.6 Luna
GPT-5.6 LunaAlternatives?
CheaperGPT-6 Lunamax+4%-62%$0.068Function calling only with none · Chat Completions+3
BetterClaude Haiku 5.5max+12%+19%$0.21Context: 1.05M → 1M+6
OpenKimi K3max-20%+1,022%$2.00Context: 1.05M → 1M+4BetterGPT-6.1 Solmax+88%+306%$0.72Remove unsupported parameters+5BetterGPT-6 Solmax+37%+486%$1.04GPT-6 Lunamax+4%-62%$0.068Function calling only with none · Chat Completions+3Claude Haiku 5.5max+12%+19%$0.21Context: 1.05M → 1M+6GPT-6.1 Solmax+88%+306%$0.72Remove unsupported parameters+5GPT-6 Solmax+37%+486%$1.04GPT-5.6 Terramax+27%+684%$1.40Prompts with >272K input tokensGPT-5.6 Solmax+33%+1,015%$1.99Kimi K3maxOpen-20%+1,022%$2.00Context: 1.05M → 1M+4Kimi K2.6unstatedOpen-49%+281%$0.95 / $4Context: 1.05M → 256KGPT-6.1 Solmax+88%+306%$0.72Remove unsupported parameters+5GPT-6 Astramax+88%+1,727%$3.26Monitoring can return HTTP 403+2GPT-6 Solmax+37%+486%$1.04GPT-5.6 Solmax+33%+1,015%$1.99GPT-5.6 Terramax+27%+684%$1.40Prompts with >272K input tokensGPT-6 Lunamax+4%-62%$0.068Function calling only with none · Chat Completions+3GPT-5.5xhigh+4%+1,377%$2.63Prompts with >272K input tokensGPT-5.2 (2025-12-11)xhigh-10%—$1.75 / $14Context: 1.05M → 400KAll OpenAI models →History
2 versionsBenchmarks
in Agents & Tool UseFAQ
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 Opus 4.8?›
On Furniture Assembly, GPT-5.6 Luna scores 42.5 vs 42.5 — about the same. It is 96% 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 It has been superseded by GPT-6 Luna.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 Luna (cheaper), Claude Haiku 5.5 (better), Kimi K3 (open weights).