LOADING DATASHEET
GROUNDED IN REAL HUMAN CONVERSATIONSYOUR BENCH
GPT 5.6 Luna
by OpenAI
CLOSEDHOSTEDFREE TO TRYCODING HELPWRITING HELPFAST RESPONSES
RANKED #31 OF 271 ASSISTANTS · OVERALL #47 OF 6,567 · VIBE SCORE 6.8 · 1,899 VOICES
A fast, versatile AI assistant designed for coding, writing, and handling long documents.
HAPPY9.3
320 mentions
SAD5.7
136 mentions
VIBE TRAJECTORY
26 weeks · 2,883 voices
QUIETLY DEGRADING
Recent vibe and chatter are both sliding.
HOW TO USE IT
Closed model. OpenAI hosts it, so you use it through an app or an API.
PREFER OPEN SOURCE? THE CROWD HAS PICKS
GPT 5.6 Luna is closed, so you rent it. These open-weight models can genuinely stand in for it. Download once, own forever.
- OPEN WEIGHTS5.4
Llama 4 MaverickMetaPick for a free, open-weight alternative with matching 1M context and superb coding.🏆 NEAR-PEER QUALITY💻 STRONG AT CODE❤️ CROWD FAVORITE2.1k VOICESMATCH★★★ - OPEN WEIGHTS6.8
Qwen3.6 35B A3BAlibabaPick to run a highly efficient, cheap multimodal agent locally on consumer hardware.🪶 RUNS ON LESS💸 COST EFFICIENT💻 STRONG AT CODE560 VOICESMATCH★★★ - OPEN WEIGHTS6.4Muse Glimmer 30BMetaPick for a highly dependable, private local agent with excellent visual understanding.🔒 PRIVATE & OFFLINE🏆 NEAR-PEER QUALITY🪶 RUNS ON LESS207 VOICESMATCH★★★
WHAT THE INTERNET SAYS
Users love GPT 5.6 Luna for its fast responses, strong coding support, and great value in long chats. However, some complain about frequent refusals, preachy replies, and service limits.
1599 POSTS · 300 COMMENTS · REDDIT · BLUESKY · HACKER NEWS · X · GITHUB · DEV.TO · DEV FORUMS · LEMMY · BLOG
PEOPLE LOVE
- People feel it is worth the money (19 mentions)
- Popular for coding help (15 mentions)
- Answers come back fast (8 mentions)
- Keeps up in long chats and big documents (4 mentions)
PEOPLE COMPLAIN ABOUT
- Refuses or lectures more than people like (8 mentions)
- Outages, errors, or limits get in the way (6 mentions)
TOPIC BY TOPIC
- PriceMOSTLY POSITIVE
19 thumbs up · 15 thumbs down
- Help with codeMOSTLY POSITIVE
15 thumbs up · 8 thumbs down
- Working when you need itMIXED FEELINGS
7 thumbs up · 6 thumbs down
- SpeedPEOPLE LOVE THIS
8 thumbs up · 1 thumbs down
- Saying no too muchA SORE SPOT
0 thumbs up · 8 thumbs down
- Long conversationsPEOPLE LOVE THIS
4 thumbs up · 1 thumbs down
- Getting facts rightPEOPLE LOVE THIS
3 thumbs up · 1 thumbs down
IN THEIR OWN WORDS
- FROM REDDIT >
“GPT 5.6 Luna is now Better than Google's Best Model and Cheaper than Google's Cheapest Model.”
- FROM X >
“codex basically gives you infinite gpt 5.6 luna max usage on the $20 chatgpt plus plan absolutely insane value imo claud.”
LOOKING FOR AN ALTERNATIVE?
Checked picks first: tags say why you would switch, stars say how fully each one stands in for GPT 5.6 Luna.
Gemini 3.7 Flash
Grok 4.6> SOURCES (12)
- REDDIT · 2026-08-17 · 1127 UPVOTESArtificial Analysis' Qwen3.8-27B benchmarks put it neck and neck with DeepSeek V4 and GPT-5.6 Luna Max
Artificial Analysis' Qwen3.8-27B benchmarks put it neck and neck with DeepSeek V4 and GPT-5.6 Luna Max
- REDDIT · 2026-07-05 · 877 UPVOTESGpt 5.6 discovered new math according to Sam Altman
Gpt 5.6 discovered new math according to Sam Altman
- REDDIT · 2026-07-31 · 784 UPVOTESNew DeepSeek V4-Flash achieves 50 on ArtificalAnalysis Index, 1 point below GLM-5.2 and GPT-5.6 Luna
New DeepSeek V4-Flash achieves 50 on ArtificalAnalysis Index, 1 point below GLM-5.2 and GPT-5.6 Luna
- X · 2026-08-16 · 718 UPVOTES🚨 THE AI BOOM HAS A MASSIVE PROBLEM NOBODY IS PRICING IN OpenAI just cut GPT-5.6 Luna by 80%, from $1 to $0.20 per mill
🚨 THE AI BOOM HAS A MASSIVE PROBLEM NOBODY IS PRICING IN OpenAI just cut GPT-5.6 Luna by 80%, from $1 to $0.20 per mill
- REDDIT · 2026-07-30 · 649 UPVOTESGPT‑5.6 Luna will cost 80% less, while GPT‑5.6 Terra will cost 20% less.
GPT‑5.6 Luna will cost 80% less, while GPT‑5.6 Terra will cost 20% less.
- REDDIT · 2026-07-30 · 622 UPVOTESOpenAI just cut GPT-5.6 Luna API pricing by 80% — the price/performance is insane
OpenAI just cut GPT-5.6 Luna API pricing by 80% — the price/performance is insane
- X · 2026-08-16 · 561 UPVOTESGPT-5.6 Luna Max scores 13.3 points above Sonnet 5 Max on DeepSWE v1.1 while Sonnet costs 44x as much. DeepSWE tests cod
GPT-5.6 Luna Max scores 13.3 points above Sonnet 5 Max on DeepSWE v1.1 while Sonnet costs 44x as much. DeepSWE tests cod
- REDDIT · 2026-07-30 · 530 UPVOTESOpenAI beats DeepSeek on price/performance after 80% Luna price cut
OpenAI beats DeepSeek on price/performance after 80% Luna price cut
- REDDIT · 2026-08-17 · 517 UPVOTESQwen3.8-27B lands next to DeepSeek V4 and GPT-5.6 Luna Max on the Artificial Analysis Benchmark. You can now run a near frontier model with…
Qwen3.8-27B lands next to DeepSeek V4 and GPT-5.6 Luna Max on the Artificial Analysis Benchmark. You can now run a near frontier model with just a RTX 3090.
- REDDIT · 2026-06-26 · 500 UPVOTESGpt 5.6 better than Mythos 5 that's really good
Gpt 5.6 better than Mythos 5 that's really good
- REDDIT · 2026-07-02 · 448 UPVOTESGpt 5.6 probably launching today or tomorrow
Gpt 5.6 probably launching today or tomorrow
- REDDIT · 2026-07-08 · 377 UPVOTESWhy Anthropic must reset Fable 5 limits before Thursday to stop OpenAI from stealing their power users
Why Anthropic must reset Fable 5 limits before Thursday to stop OpenAI from stealing their power users