aiintelligence

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
92/100 · Humanising AI text
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
91/100 · Book writing
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
93/100 · Health questions
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
92/100 · Legal questions
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
95/100 · Emotional support
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
93/100 · Travel planning
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
94/100 · Translation
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
94/100 · Creative writing
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
96/100 · Research
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
88/100 · CV writing
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
98/100 · Presentations
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
97/100 · Vibe coding
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
92/100 · Job applications
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
98/100 · Social posts
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
91/100 · Flashcards
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
93/100 · Coding
18 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
91/100 · Study notes
12 tasks, marked blind by 3 judges · 14 Aug 2026 · receipts
93/100 · Customer replies
12 tasks, marked blind by 3 judges · 14 Aug 2026 · receipts
98/100 · Maths
12 tasks, marked blind by 3 judges · 14 Aug 2026 · receipts
97/100 · Emails
12 tasks, marked blind by 3 judges · 14 Aug 2026 · receipts
98/100 · Extraction
12 tasks, marked blind by 3 judges · 13 Aug 2026 · receipts
97/100 · Summarising
12 tasks, marked blind by 3 judges · 13 Aug 2026 · receipts
91/100 · Essays
12 tasks, marked blind by 3 judges · 13 Aug 2026 · receipts
98/100 · Spreadsheets
12 tasks, marked blind by 3 judges · 13 Aug 2026 · receipts
API price (per 1M in/out)
$0.2 / $1.2
OpenRouter API17 Aug 2026
Battle record
unfought
no battle yet — we don't guess
Forum sentiment (90d)
50%
developer-forum posts: 12 opinions in 112
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)