← comparisons · head to head
GPT-6 Luna vs GPT-6.1 Sol
GPT-6.1 Sol scores higher than GPT-6 Luna on all 4 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6 Luna is at 31.4 and GPT-6.1 Sol at 88.2 (out of 100).
Scores as published by each board; table composed October 8, 2026.
Get the next launch alert, free →
Leaderboard by leaderboard
| Board | GPT-6 Luna | GPT-6.1 Sol | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,580.9 | 1,755.4 | GPT-6.1 Sol |
| LiveBench global average (0-100) | 72 | 81.6 | GPT-6.1 Sol |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 51.2 | 61.2 | GPT-6.1 Sol |
| Artificial Analysis intelligence index · measured runs only | 38.1 | 51.8 | GPT-6.1 Sol |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, GPT-6 Luna is at 26.5 (#27 of 35) and GPT-6.1 Sol at 82.4 (#6). GPT-6.1 Sol scores higher on all 3 coding boards that rate both.
| Coding board | GPT-6 Luna | GPT-6.1 Sol |
|---|---|---|
| LMArena · Coding | 1,508.4 | 1,545.3 |
| LiveBench · Coding | 65.1 | 68.8 |
| Vals Vibe Code Bench | 81.6 | 88.9 |
GPT-6 Luna at a glance
- Developer
- OpenAI
- Status
- Live since September 22, 2026
- API price
- $0.10 input / $0.50 output per 1M tokens · OpenAI, gpt-6-luna
- Context window
- 1.05M tokens
Live — Sep 22, in the API and ChatGPT (Free and Go too) the same day · the cheap, high-volume tier · models.dev lists gpt-6-luna on OpenAI's own API (read Sep 24).
OpenAI opens the Decisions API: GPT-6 Luna returns probabilities, choices and scores for $0.10 per million input tokens
2026-10-06 · OpenAI has opened a public beta of the Decisions API, a new endpoint (POST /v1/decisions) where the model answers a question about your input with a number or a label instead of writing text. GPT-6 Luna is the only model it runs.
GPT-6.1 Sol at a glance
- Developer
- OpenAI
- Status
- Live since September 29, 2026
- API price
- $2 input / $10 output per 1M tokens · OpenAI, gpt-6.1-sol
- Context window
- 1.05M tokens
Live — Sep 29, launched at DevDay · Ultrafast tier open to all API users Oct 8 at $12/$60 (six times standard, OpenAI's pricing page) · $2/$10 per 1M, cached input $0.10 (half of GPT-6 Sol's) · in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise and Edu, not yet in Chat · OpenAI says it nearly matches GPT-6 Astra on agentic coding, computer use and professional work at a fifth of Astra's price · Artificial Analysis Intelligence Index 52 at max effort, #10 of 221 reasoning models (read Sep 29) · 1.05M ctx as OpenRouter lists it, which also carries gpt-6.1-sol-pro (the same model in a pro reasoning mode) · Ultrafast (up to 8x faster in Codex) 'in the coming days' · our sweep read gpt-6.1-sol on OpenAI's public model docs at 17:23 UTC and fired at 17:24, about 20 minutes after the keynote.
GPT-6.1 Sol Ultrafast opens to every API user at $12 / $60, six times standard Sol
2026-10-08 · OpenAI's Ultrafast tier now covers GPT-6.1 Sol for every API user. OpenAI's API docs, read on October 8, say Ultrafast mode is "broadly available" for GPT-6 Astra and GPT-6.1 Sol and "available to all API users", with preview access for GPT-5.6 Sol.
GPT-6.1 Sol ships at DevDay at $2/$10, and OpenAI says it nearly matches Astra
2026-09-29 · OpenAI launched GPT-6.1 Sol at its DevDay keynote on September 29. It is available now in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise and Edu users, not yet in Chat, and in the API as gpt-6.1-sol.
GPT-6 Luna vs GPT-6.1 Sol: quick answers
Which is better, GPT-6 Luna or GPT-6.1 Sol?
It depends on what you measure. GPT-6.1 Sol scores higher than GPT-6 Luna on all 4 public leaderboards that rate both. GPT-6.1 Sol's widest lead is on LiveBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6 Luna is at 31.4 and GPT-6.1 Sol at 88.2 (out of 100).
Which is newer, GPT-6 Luna or GPT-6.1 Sol?
GPT-6.1 Sol. It went live on September 29, 2026, 7 days after GPT-6 Luna (September 22, 2026).
Which is cheaper, GPT-6 Luna or GPT-6.1 Sol?
GPT-6 Luna is cheaper on both input and output. On each vendor's own API, GPT-6 Luna is $0.10 input / $0.50 output per million tokens and GPT-6.1 Sol is $2 input / $10 output per million tokens. GPT-6 Luna's rate rises for prompts over 272K tokens; GPT-6.1 Sol's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-10-08.
Which has the bigger context window, GPT-6 Luna or GPT-6.1 Sol?
Neither. Both take 1.05M tokens.
How do GPT-6 Luna and GPT-6.1 Sol compare for coding?
On the ArtificialWatch coding index, GPT-6 Luna is at 26.5 (#27 of 35) and GPT-6.1 Sol at 82.4 (#6). GPT-6.1 Sol scores higher on all 3 coding boards that rate both.
Who makes GPT-6 Luna and GPT-6.1 Sol?
Both are from OpenAI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed October 8, 2026). Boards measure different things, so raw scores are only comparable within a row.
More comparisons
Hear the minute the next one drops. Free.
A free Chrome push the moment a new model answers on a public API, an email about 15 minutes later. Texts or a phone call on paid plans.
- Free forever
- No card
- Unsubscribe in one click
Also: the bench index · API pricing · the wire