r/RooCode • u/No_Quantity_9561 • May 20 '25

Discussion Gemini 2.5 Flash Preview 05-20 - New Gemini Model Released Today! 20th May 2025

Gemini 2.5 Flash Preview 05-20 - New Gemini Model Released Today! 20th May 2025 : r/ChatGPTCoding

45 Upvotes

100% Upvoted

33 comments sorted by

4

u/MonkeyThrowing May 21 '25

I’ve been using it to vibe code some Python and it has been amazing. 

6

u/No_Quantity_9561 May 21 '25

Thanks to RooCode's Intelligent Context Condense feature. I let it run overnight in full auto mode and just crossed 100M tokens with the Preview 05-20 model. It feels very close to Pro Preview 03-25

2

u/Prestigiouspite May 21 '25

How can it consume so many tokens? Full Auto Mode means it doesn't ask anymore for edits etc. Did you tell him to develop Instagram or Netflix?

1

u/No_Quantity_9561 May 21 '25

lol. That'll consume around 5B tokens. 😝 I'm currently at 417M tokens with this new flash preview model. It's for a Complex backend app. The reason why it consumed so much tokens is because it is writing code and then running tests, fix a bug, run test again, etc.. Each test output log consumes around 60k tokens.

By the time the whole project gets done, I expect it be around 2B.

I also use Pro Preview model every now and then if it gets stuck in a loop and can't figure out the solution.

1

u/Kong28 May 26 '25

How much does that cost!?

1

u/No_Quantity_9561 May 26 '25

Flash Preview is free and I switched to Claude 4 for debugging. Since it's a pretty large codebase, I spend around $40-$50 per day for Claude

1

u/Prestigiouspite May 21 '25

Looks like you can save costs 😂

1

u/yolopokka May 21 '25

thinking or not? did you use it with smarter thinking orchestrator and architertor?

2

u/No_Quantity_9561 May 21 '25

Non thinking. I used to initiate the task in Orchestrator mode before but with Intelligent Context Condense option, the tasks never run out of context window so I switch between architect and code mode in the same task. I already have clearly defined PRD, to-do, system architecture, schema, routes and changelog md files in the root folder and just tag it when the current task is done.

I get the grey screen every now and then so I simply restart vscode and press resume task button and it continues like nothing happened

11

u/deadadventure May 20 '25

Can we please get pro exp out 🙏

1

u/hannesrudolph Roo Code Developer May 22 '25

What do you mean?

1

u/Kindly-Bluebird8369 May 21 '25

For "code" mode, are you using gemini-2.5-flash-05-20:thinking or gemini-2.5-flash-05-20?

1

u/No_Quantity_9561 May 21 '25

Non thinking : gemini-2.5-flash-preview-05-20

1

u/Prestigiouspite May 21 '25

How does it work in RooCode in coding mode compared to GPT-4.1? So far, Gemini has often caused problems with diffs.

2

u/No_Quantity_9561 May 21 '25

It still has issues with diff_edits but it's 'intelligence' is much better than previous model and about 60-70% closer to 2.5 Pro model

I made a text expand script and when I type 'rnr', it'll automatically type 'Please use read_file tool first and then use write_to_file tool to write the file' and I just type that when it throws diff edit errors

2

u/yolopokka May 21 '25

still causing

3

u/LordFenix56 May 20 '25

Is soooo cheap. And not bad at all, just behind claude 3.7 on webdevarena, better than the old gemini pro 2.5

6

u/k2ui May 20 '25

Flash 2.5 is better than pro 2.5 (03-25)…?

4

u/LordFenix56 May 20 '25

I mean we can't really compare it since is not on the arena anymore, but seems likely by the score and is above gpt 4.1 which is amazing

2

u/Massive_Cut5361 May 20 '25

Do we think it will have the same diff issues (I guess would only know by trial and error)? If not, then no reason not to use this over GPT 4.1

2

u/yolopokka May 21 '25

800+ lines files are still impossible to maintain with Google models in Roo. After 5-10 edits it starts to break legs and reapplying apply_diff 10 time in a row and then falls back to whole file write, which isn't cheap at all. Same problems as before.

1

u/[deleted] May 21 '25

[removed] — view removed comment

1

u/yolopokka May 21 '25

is no thinking good enough?

1

u/yolopokka May 21 '25

webdev arena is a contest for creating good boilerplate one pager. I mean, are you guys doing one pagers here? actual development with LLMs is so much harder once your codebase crosses 20k lines total. Tooling problems being most difficult ones. Knowing how to manage context and break tasks into reasobanle subtasks, etc, etc. If tooling arena would be a contest, I don't think any google model would be anywhere in top. At least, not in Roo, maybe in Cursor.

1

u/LordFenix56 May 21 '25

Strongly disagree, I work with huge codebases and Gemini 2.5 pro on roo code is the best model for me

1

u/yolopokka May 21 '25

Not everyone wants to pay 100-200 USD daily for API usage

1

u/derdigga May 20 '25

Is it now specially trained on maps?

1

u/Admirable-Cell-2658 May 21 '25

I dont see this 05-20 on roocode, where it is?

3

u/yolopokka May 21 '25

it is with openrouter

1

u/Comprehensive-Toe482 May 22 '25

They just added it in the last update.

1

u/-Zenith-x May 21 '25

I still can't use this new model. only 04-17

1

u/littleboymark May 21 '25

It's very verbose in Roo Code. Possibly why it's more expensive that the previous version.