GPT-5.6 Lunalatest from openai
People use it to run fast online chats and classify text.
openai’s newest large language model, able to hold about 1050k tokens of context (roughly 788k words) in one conversation, working across text and image and file->text. You reach it through an API or through tools built on it. Built for anyone needing fast chat and text classification tools. openai describes it as: “GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series.” source ↗
Our tested score
Battle record
unfought
no battle yet — we don't guess
Forum sentiment — 90d to 12 Aug 2026
50%
developer-forum posts: 12 opinions in 112
stale — measured 41 days ago, not re-swept since
What people are posting (90 days)
Loudest post this quarter
“ChatGPT 5.6 for Web Design (Sol, Terra, Luna)”
Compare GPT-5.6 Luna against…
GPT-5.6 Terra · spreadsheets & ExcelGPT-5.3-Codex · spreadsheets & ExcelGPT-5.6 Sol · spreadsheets & ExcelGPT-5.5 · spreadsheets & ExcelGLM 5.2 · spreadsheets & ExcelQwen3.7 Max · spreadsheets & ExcelGrok 4.5 · spreadsheets & ExcelClaude Opus 4.8 · spreadsheets & ExcelDeepSeek V4 Flash · spreadsheets & ExcelGPT-5.6 Sol · essay writingGPT-5.5 · essay writingGPT-5.6 Terra · essay writingGPT-5.3-Codex · essay writingClaude Sonnet 5 · essay writingClaude Opus 4.6 · essay writingGrok 4.5 · essay writingQwen3.7 Max · essay writingGemini 3.1 Pro Preview · essay writingClaude Opus 4.8 · summarising documents
Every claim we hold (3)
- api price in per 1m0.2 USD/1M tokensOpenRouter API23 Sept 2026verified
- api price out per 1m1.2 USD/1M tokensOpenRouter API23 Sept 2026verified
- context length1050000 tokensOpenRouter API23 Sept 2026verified