GPT-6.1 Sol vs GPT-6 Luna
GPT-6.1 Sol scores higher on the Models at Work leaderboard (82 vs 66 out of 100). GPT-6 Luna is about 20× cheaper per blended million tokens ($0.20 vs $4). On Artificial Analysis' independent Intelligence Index, GPT-6.1 Sol leads 52 to 38.
| GPT-6.1 Sol · OpenAI | GPT-6 Luna · OpenAI | |
|---|---|---|
| Leaderboard rank | #5 | #10 |
| Score (0–100) | 82 | 66 |
| Tier | Workhorse | Fast and cheap |
| Price per 1M tokens | $2 in · $10 out | $0.10 in · $0.50 out |
| Context window | 1M | 1M |
| Open weights | No | No |
| Artificial Analysis Intelligence Index | 52 | 38 |
| Humanity's Sixth Sense (Scale) | 46.6 | — |
| Best for | OpenAI-standardised teams, Agents API and Decisions API, Cost-controlled reasoning | ChatGPT Free and Go tier, Simple extraction, Cost floors |
Choose GPT-6.1 Sol if…
- you need openai-standardised teams
- you need agents api and decisions api
- you need cost-controlled reasoning
Near-Astra intelligence at a fifth of the price, which is OpenAI's own line and, for once, the index agrees.
Choose GPT-6 Luna if…
- you need chatgpt free and go tier
- you need simple extraction
- you need cost floors
OpenAI's ten-cent model: the one every ChatGPT Free user now has, and the one Haiku users keep comparing themselves to.
What practitioners say
GPT-6.1 Sol: The launch thread's title did the arguing: 'near-Astra for a fifth of the price' drew 955 comments, most of them about routing.
Questions people ask
Which is better, GPT-6.1 Sol or GPT-6 Luna?
GPT-6.1 Sol scores higher on the Models at Work leaderboard (82 vs 66 out of 100). GPT-6 Luna is about 20× cheaper per blended million tokens ($0.20 vs $4). On Artificial Analysis' independent Intelligence Index, GPT-6.1 Sol leads 52 to 38.
When should I choose GPT-6.1 Sol over GPT-6 Luna?
Choose GPT-6.1 Sol for openai-standardised teams, agents api and decisions api, cost-controlled reasoning. Near-Astra intelligence at a fifth of the price, which is OpenAI's own line and, for once, the index agrees.
When should I choose GPT-6 Luna over GPT-6.1 Sol?
Choose GPT-6 Luna for chatgpt free and go tier, simple extraction, cost floors. OpenAI's ten-cent model: the one every ChatGPT Free user now has, and the one Haiku users keep comparing themselves to.
Which is cheaper, GPT-6.1 Sol or GPT-6 Luna?
GPT-6.1 Sol costs $2 per million input tokens and $10 per million output tokens on OpenAI's list price (OpenAI API pricing, read Oct 10, 2026). GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens on OpenAI's list price (OpenAI API pricing, read Oct 10, 2026).
Scores come from the Models at Work leaderboard: Score is 0 to 100: 50% independent evals normalised within this table, 20% price-performance, 15% practitioner sentiment from Signals and community threads, 15% operational fit (context, speed, availability, open weights). Models within three points are a tie in practice. Vendor-published figures are labelled as such and never counted as independent. Prices are vendor list prices where published; blended figures assume three input tokens per output token.