# Replit and sonnet 4.5 **URL:** \ **Category:** Agent & Assistant\ **Tags:** using-replit, agent, announcement\ **Created:** [September 30, 2025, 4:03am UTC](https://replit.discourse.group/t/replit-and-sonnet-4-5/7343 "2025-09-30T04:03:40Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Gipity-Steve](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/gipity-steve/32/1431_2.png) [@Gipity-Steve](https://replit.discourse.group/u/Gipity-Steve)\ **Post date:** [September 30, 2025, 4:03am UTC](https://replit.discourse.group/t/replit-and-sonnet-4-5/7343/1 "2025-09-30T04:03:40Z")
Nice!!! But what will this do to the costs? ![image](https://canada1.discourse-cdn.com/flex010/uploads/replit/original/2X/f/f6c6aeffbe615900832977fda55edc55254875b4.jpeg) ---
**Author:** ![EthanTorbenson](https://avatars.discourse-cdn.com/v4/letter/e/ed8c4c/32.png) [@EthanTorbenson](https://replit.discourse.group/u/EthanTorbenson)\ **Post date:** [September 30, 2025, 5:29am UTC](https://replit.discourse.group/t/replit-and-sonnet-4-5/7343/2 "2025-09-30T05:29:52Z")
I’m finding it’s way cheaper, because it’s way better at actually solving the problems. It’s also technically the same cost as Sonnet 4.1 was ---
**Author:** ![Gipity-Steve](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/gipity-steve/32/1431_2.png) [@Gipity-Steve](https://replit.discourse.group/u/Gipity-Steve)\ **Post date:** [September 30, 2025, 5:40am UTC](https://replit.discourse.group/t/replit-and-sonnet-4-5/7343/3 "2025-09-30T05:40:37Z")
Great timing, as will be going for a big new build today/tomorrow. agent v3 (high mode) + sonnet 4.5 = I am expecting miracles 😊 ---
**Author:** ![jefftj86](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/jefftj86/32/1189_2.png) [@jefftj86](https://replit.discourse.group/u/jefftj86)\ **Post date:** [September 30, 2025, 6:30am UTC](https://replit.discourse.group/t/replit-and-sonnet-4-5/7343/4 "2025-09-30T06:30:04Z")
Siiick. Need all the help I can get now to catch up for hte last two weeks lost, good timing. ---
**Author:** ![danielgadus](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/danielgadus/32/1873_2.png) [@danielgadus](https://replit.discourse.group/u/danielgadus)\ **Post date:** [September 30, 2025, 6:45am UTC](https://replit.discourse.group/t/replit-and-sonnet-4-5/7343/5 "2025-09-30T06:45:41Z")
After short test and few prompts, the 4.5 was able to fix some bugs I had faced, which the previous model was not able to. Looks like is better 😉 I’m so glad for it so far 💪 ---
**Author:** ![shawn93](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/shawn93/32/1239_2.png) [@shawn93](https://replit.discourse.group/u/shawn93)\ **Post date:** [September 30, 2025, 2:02pm UTC](https://replit.discourse.group/t/replit-and-sonnet-4-5/7343/6 "2025-09-30T14:02:16Z")
This makes a lot of sense, I opened a new Agent chat last night on a feature I’ve been putting on hold because it’s been so tough to fix. One prompt and woke up this morning to it working! ---
**Author:** ![realfunnyeric](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/realfunnyeric/32/2150_2.png) [@realfunnyeric](https://replit.discourse.group/u/realfunnyeric)\ **Post date:** [September 30, 2025, 8:43pm UTC](https://replit.discourse.group/t/replit-and-sonnet-4-5/7343/7 "2025-09-30T20:43:55Z")
Did you go for it? ---
**Author:** ![Gipity-Steve](https://yyz2.discourse-cdn.com/flex010/user_avatar/replit.discourse.group/gipity-steve/32/1431_2.png) [@Gipity-Steve](https://replit.discourse.group/u/Gipity-Steve)\ **Post date:** [October 1, 2025, 4:59am UTC](https://replit.discourse.group/t/replit-and-sonnet-4-5/7343/8 "2025-10-01T04:59:12Z")
In trenches building native app for complete RAG chatbot -STOP- Attempting idea to launch in 3 days with Gipity AI Dev Kit, Replit high autonomy and Claude 4.5 -STOP- Fantastic experience during planning phase -STOP- Detailed 814 line PRD produced by agent -STOP- Single build prompt no longer viable, but build phase underway and trust levels high -STOP- Full report within days -STOP- Send coffee, supplies low -END MESSAGE-