# GPT-6.1 Sol in the API: a meaningful step up in cost-performance **URL:** \ **Category:** Announcements\ **Tags:** codex, chatgpt, api, devday-2026\ **Created:** [September 30, 2026, 10:30pm UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388 "2026-09-30T22:30:59Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![VeitB](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/veitb/32/712987_2.png) [@VeitB](https://community.openai.com/u/VeitB)\ **Post date:** [September 30, 2026, 10:30pm UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/1 "2026-09-30T22:30:59Z")
![devday_under_10mb](https://us1.discourse-cdn.com/openai1/original/4X/8/d/5/8d5963c6d40da4afa7577c40f8e99a82043f836d.gif) GPT-6.1 Sol is one of the very interesting Dev Day releases for the API because of the price performance developers get from this model. GPT-6.1 Sol is getting close to Astra on complex work while costing less. The DevDay roundup puts that into perspective: improved coding and computer-use performance, with standard token prices at one-fifth of Astra’s. Compared with the original GPT-6 Sol, GPT-6.1 Sol keeps the same $2/M input and $10/M output pricing, while cutting cached input from $0.20/M to $0.10/M. On DeepSWE v1.1, GPT-6.1 Sol achieves 75.2% at high reasoning effort, surpassing GPT-6 Sol’s best score of 68.8% at maximum effort, at approximately 76% lower cost per task. ![HTZwCmmbEAArj5K](https://us1.discourse-cdn.com/openai1/original/4X/f/e/4/fe49520274ad19d70346154a20ea6314044985bd.png) On AutomationBench, GPT-6.1 Sol scores 31.7% at medium reasoning effort, up 4.8 percentage points from GPT-6 Sol at the same setting. On OSWorld 2.0’s offline set, it scores 71.4% versus Astra’s 73.5%, both at maximum reasoning effort, at roughly one-seventh of Astra’s cost per task. ![HTZwDesbIAAlkFw](https://us1.discourse-cdn.com/openai1/original/4X/c/7/7/c77cf0555faf148f9423544c8f54054779446ad4.png) ![HTZwDqSaoAA1t-Y](https://us1.discourse-cdn.com/openai1/original/4X/0/6/c/06c16dc30ba78e59ad5c467365e626e53fa49f23.png) For your most demanding work, choose Astra when maximizing quality matters most. For complex work you want to run more often, GPT-6.1 Sol gives you near-Astra performance at a substantially lower cost. GPT-6.1 Sol is available today in ChatGPT Work, Codex, and in the API. ---
**Author:** ![proflead](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/proflead/32/756842_2.png) [@proflead](https://community.openai.com/u/proflead)\ **Post date:** [October 1, 2026, 3:15pm UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/2 "2026-10-01T15:15:45Z")
Do you know when Sol 6.1 will be available outside the US? I still don’t see it in my ChatGPT desktop app. ---
**Author:** ![merefield](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/merefield/32/14812_2.png) [@merefield](https://community.openai.com/u/merefield)\ **Post date:** [October 1, 2026, 3:39pm UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/3 "2026-10-01T15:39:06Z")
> [@proflead](#): > > Do you know when Sol 6.1 will be available outside the US? FYI Here in the UK it is already the default model for Codex CLI This may be a ChatGPT rollout thing … ---
**Author:** ![VeitB](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/veitb/32/712987_2.png) [@VeitB](https://community.openai.com/u/VeitB)\ **Post date:** [October 1, 2026, 4:14pm UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/4 "2026-10-01T16:14:59Z")
Maybe updating to the latest version of the app is all that’s needed? The new model is rolling out to everyone at the same time across all surfaces. ---
**Author:** ![proflead](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/proflead/32/756842_2.png) [@proflead](https://community.openai.com/u/proflead)\ **Post date:** [October 2, 2026, 10:26am UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/5 "2026-10-02T10:26:05Z")
It’s super strange. I see only 2 models in the ChatGPT Chat (website). I see more models in ChatGPT Work (website). I don’t see Sol-6.1 in the ChatGPT Desktop App on Linux (version 26.915.31945). ![image](https://us1.discourse-cdn.com/openai1/original/4X/4/1/2/41238700c585d89247fc996882044ef1fff53a06.png) ![image](https://us1.discourse-cdn.com/openai1/original/4X/e/4/1/e412b94833eec1fc46d8d07535c1fe71ffdc5e21.png) ![image](https://us1.discourse-cdn.com/openai1/original/4X/9/8/d/98dd0b843afbff0d9ef2b1c6aabf8ab8e3f261b3.png) ---
**Author:** ![merefield](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/merefield/32/14812_2.png) [@merefield](https://community.openai.com/u/merefield)\ **Post date:** [October 2, 2026, 11:02am UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/6 "2026-10-02T11:02:18Z")
I’m in UK and on ChatGPT web I only see 5.6 Sol and 5.5 (“leaving 14th October”) - that date might be significant and might herald the loss of 5.5 but also the arrival of a replaced set - 6.1 Sol, perhaps? ---
**Author:** ![platypus](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/platypus/32/759972_2.png) [@platypus](https://community.openai.com/u/platypus)\ **Post date:** [October 2, 2026, 11:14am UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/7 "2026-10-02T11:14:19Z")
My understanding is that the latest models are not part of “Chat”. They are either in “Work” or in “Codex”. ---
**Author:** ![platypus](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/platypus/32/759972_2.png) [@platypus](https://community.openai.com/u/platypus)\ **Post date:** [October 2, 2026, 11:27am UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/9 "2026-10-02T11:27:43Z")
Ok looks like it’s a real issue and I’m not hallucinating. Basically Codex desktop seems to have removed 6.1 Sol, see here: [Custom provider catalog disappears after desktop update: existing Sol 6.1 chats show Custom (0.159.0-alpha.12.1) · Issue #50282 · openai/codex · GitHub](https://github.com/openai/codex/issues/50282) ---
**Author:** ![merefield](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/merefield/32/14812_2.png) [@merefield](https://community.openai.com/u/merefield)\ **Post date:** [October 8, 2026, 8:42am UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/10 "2026-10-08T08:42:43Z")
Rejoice ![image](https://us1.discourse-cdn.com/openai1/original/4X/f/5/a/f5a580bc270130f51272d302e6b3cd406b737fab.png) (Although it’s not marked 6.1, nor “Sol”) See: [GPT-6 and Intelligent UI in ChatGPT](https://community.openai.com/t/gpt-6-and-intelligent-ui-in-chatgpt/1404139) ---
**Author:** ![\_j](https://sea2.discourse-cdn.com/openai1/user_avatar/community.openai.com/_j/32/766292_2.png) [@\_j](https://community.openai.com/u/_j)\ **Post date:** [October 8, 2026, 8:50am UTC](https://community.openai.com/t/gpt-6-1-sol-in-the-api-a-meaningful-step-up-in-cost-performance/1402388/11 "2026-10-08T08:50:08Z")
> [@merefield](#): > > (Although it’s not marked 6.1, nor “Sol”) (although its not marked as any model size whatsoever, and you’ll be routed to whatever is thought to fulfill the task in a family that includes “sol” (“terra?”), “luna”, (and whatever else might be called “gpt-6”) or a model that has internal knobs to tweak on it - even “quick answers” based on input that will drop your customization and memory items also.) Now at least 5.6 can deliver 5.6-pro at its top-end of reasoning effort if that is your preference instead of a model switch.