← comparisons · head to head
GPT-6.1 Sol vs GPT-5.6
GPT-6.1 Sol scores higher than GPT-5.6 on all 6 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-6.1 Sol is at 88.2 and GPT-5.6 at 65.2 (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-6.1 Sol | GPT-5.6 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,755.4 | 1,618.3 | GPT-6.1 Sol |
| LiveBench global average (0-100) | 81.6 | 81.1 | GPT-6.1 Sol |
| SimpleBench AVG@5 % (private set) | 82.9 | 71.7 | GPT-6.1 Sol |
| LLM Stats LLM Stats Score · composite (0-100), their rendered top 15 | 53.9 | 53.5 | GPT-6.1 Sol |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 61.2 | 58 | GPT-6.1 Sol |
| Artificial Analysis intelligence index · measured runs only | 51.8 | 47 | 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-6.1 Sol is at 82.4 (#6 of 35) and GPT-5.6 at 76.5 (#10). GPT-6.1 Sol scores higher on 2 of the 3 coding boards that rate both and GPT-5.6 on 1.
| Coding board | GPT-6.1 Sol | GPT-5.6 |
|---|---|---|
| LMArena · Coding | 1,545.3 | 1,534.9 |
| LiveBench · Coding | 68.8 | 70.1 |
| Vals Vibe Code Bench | 88.9 | 80.5 |
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-5.6 at a glance
- Developer
- OpenAI
- Status
- Live since July 9, 2026
- API price
- $4 input / $20 output per 1M tokens · OpenAI, gpt-5.6
- Context window
- 1.05M tokens
Live — Sol · Terra · Luna since Jul 9 · repriced Jul 30: Luna −80%, Terra −20%.
Three ChatGPT leaks in five hours were one release note — and the line none of them quoted is the real change
2026-08-06 · Three separate leaks landed in five hours claiming three separate ChatGPT changes: an upgraded GPT-5.6 Sol for Plus and Pro, a new reasoning slider rolling out, and unlimited chats coming for free users. All three are real.
OpenAI cut Luna 80% — Azure kept the old price, so Luna costs 5× more on Azure than direct
2026-08-04 · OpenAI cut GPT-5.6 Luna by 80% on July 30. We covered it. What we did not check — and should have, because it is the number that actually lands on a bill — is whether the clouds passed it on.
GPT-6.1 Sol vs GPT-5.6: quick answers
Which is better, GPT-6.1 Sol or GPT-5.6?
It depends on what you measure. GPT-6.1 Sol scores higher than GPT-5.6 on all 6 public leaderboards that rate both. GPT-6.1 Sol's widest lead is on SimpleBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6.1 Sol is at 88.2 and GPT-5.6 at 65.2 (out of 100).
Which is newer, GPT-6.1 Sol or GPT-5.6?
GPT-6.1 Sol. It went live on September 29, 2026, 82 days after GPT-5.6 (July 9, 2026).
Which is cheaper, GPT-6.1 Sol or GPT-5.6?
GPT-6.1 Sol is cheaper on both input and output. On each vendor's own API, GPT-6.1 Sol is $2 input / $10 output per million tokens and GPT-5.6 is $4 input / $20 output per million tokens. GPT-6.1 Sol's rate rises for prompts over 272K tokens; GPT-5.6'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-6.1 Sol or GPT-5.6?
Neither. Both take 1.05M tokens.
How do GPT-6.1 Sol and GPT-5.6 compare for coding?
On the ArtificialWatch coding index, GPT-6.1 Sol is at 82.4 (#6 of 35) and GPT-5.6 at 76.5 (#10). GPT-6.1 Sol scores higher on 2 of the 3 coding boards that rate both and GPT-5.6 on 1.
Who makes GPT-6.1 Sol and GPT-5.6?
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