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GPT-6 Luna 💰 Budget Pick

by OpenAI · Text & Chat · Code · Budget & Fast

OpenAI’s budget GPT-6 · default for Free & Go ChatGPT users since Oct 8 · AA Intelligence Index 28 · API $0.10/$0.50 per 1M tokens · 1M context.

88/100AIVerso score
#22 of 54in Text & Chat
Free in ChatGPT · API $0.10/$0.50 per 1MStarting price
YesFree tier
Try GPT-6 Luna →Compare with alternatives →

What is GPT-6 Luna?

GPT-6 Luna is OpenAI’s budget GPT-6 model for high-volume API use. It costs only cents per million tokens while still offering a 1M-token context and solid coding performance. Since October 8, 2026 it is also the default model for Free and Go users in ChatGPT.

Best for

GPT-6 Luna pricing

GPT-6 Luna has a free tier. Price: Free in ChatGPT · API $0.10/$0.50 per 1M.

Plans & prices

Prices as published by OpenAI. This page was last updated on November 13, 2026; prices and plans change often, so check the provider’s pricing page before you buy.

Check current GPT-6 Luna prices →

At a glance

ProviderOpenAI
CategoryText & Chat, Code, Budget & Fast
Starting priceFree in ChatGPT · API $0.10/$0.50 per 1M
Free tierYes
API accessYes
Open sourceNo
Context window1M tokens

Key facts

GPT-6 Luna benchmarks

LeaderboardResult
Artificial Analysis Intelligence Index v528 points

The Artificial Analysis Intelligence Index combines several independent evaluations of reasoning, knowledge, maths and coding — see our full AA Index v5 ranking.

Capability ratings

Math & Logice.g. AIME, MATH-500
84
Programminge.g. SWE-bench, LiveCodeBench
79
Reasoninge.g. GPQA, ARC
82
Knowledgee.g. MMLU-Pro
82
Long Contexte.g. MRCR, needle tests
88
Instruction Followinge.g. IFEval
86
Agent Capabilitye.g. Terminal-Bench, tool use
76

AIVerso capability ratings (0–100), an editorial summary informed by public benchmark results. Higher is better.

Strengths

Free tier available
Large 1M token context window
API access for developers

Limitations

Closed model — cannot be self-hosted

Best alternatives to GPT-6 Luna

Claude Fable 5.2
Anthropic · $8/$40 per 1M tokens — Higher score (99 vs 88)
99
Gemini 4 Carbon
Google · $2/$10 per 1M tokens (API, until Nov 30) — Higher score (98 vs 88)
98
Fugu Ultra v2
Sakana AI · $5/$30 per 1M tokens — Higher score (97 vs 88)
97
Kimi K3.1 Pro
Moonshot AI · Free – API · free tier — Higher score (95 vs 88)
95
Muse Wonder 1.0
Meta · $4/$20 per 1M tokens (API) — Higher score (93 vs 88)
93

🔗 Comparisons & guides

Best AI Chatbot 2026: Top 7 AI Assistants RankedBest-of guide
All AI modelsModel directory

❓ Frequently Asked Questions

What is GPT-6 Luna?

GPT-6 Luna is OpenAI’s budget GPT-6 model for high-volume API use. It costs only cents per million tokens while still offering a 1M-token context and solid coding performance. Since October 8, 2026 it is also the default model for Free and Go users in ChatGPT.

What is GPT-6 Luna best for?

GPT-6 Luna is a strong pick for: Very high-volume, cost-sensitive API tasks; Classification, extraction and summarisation; Replacing older small OpenAI models.

How does GPT-6 Luna perform in benchmarks?

GPT-6 Luna scores 28 on the Artificial Analysis Intelligence Index v5.

How much does GPT-6 Luna cost?

GPT-6 Luna starts at Free in ChatGPT · API $0.10/$0.50 per 1M. A free tier is available.

Is GPT-6 Luna free?

Yes — GPT-6 Luna has a free tier. Pricing: Free in ChatGPT · API $0.10/$0.50 per 1M.

What are the best alternatives to GPT-6 Luna?

The highest-rated AI chatbots & text models from other providers on AIVerso are Claude Fable 5.2 (99/100), Gemini 4 Carbon (98/100), Fugu Ultra v2 (97/100).

Does GPT-6 Luna have an API?

Yes, GPT-6 Luna can be used via an API.

Is GPT-6 Luna open source?

No, GPT-6 Luna is a closed, proprietary model from OpenAI.

How does AIVerso rate GPT-6 Luna?

GPT-6 Luna scores 88/100 on AIVerso and ranks #22 of 54 in Text & Chat. Scores combine public benchmark results, features and pricing; commissions never influence them.

How we rate: Scores and capability ratings are based on public benchmarks, provider documentation, features and pricing — not on commission rates. Prices can change; check the provider's site before buying. Last updated: November 13, 2026.