Gemini’s Latest “Implicit Caching” and 2.5 Pro (Preview) Update: Significant Problems from Outdated Code and Errors — Are There Fixes or Disable Options?

Title: Troubleshooting Gemini’s Latest Update: Challenges with Implicit Caching and Hallucinations

Since the rollout of Google’s Gemini update on May 8, 2025, which introduced the “implicit caching” feature alongside the transition from 2.5 Pro (experimental) to 2.5 Pro (preview), many users have expressed frustration with the tool’s usability for coding tasks. This update has significantly affected performance, leading to a series of issues that can hinder productivity.

The Insightful Workflow that Crumbled

In the past, users found that when Gemini’s responses began to wane—characterized by increased hallucinations and less coherent replies—beginning a new chat with a brief summary often rectified the situation. This method allowed developers to tackle ongoing coding challenges effectively. However, post-update, even starting fresh chats with clear prompts and uploading current code files has led to two alarming problems:

1. Accessing Obsolete Code: One of the most concerning changes is Gemini’s apparent use of outdated code. Despite uploading recent files, the tool has been pulling from versions that are up to two months old, raising questions about the persistence of these older versions across different chat sessions. Previously, the inability to recall older prompts was a significant advantage, but now it feels like an impediment.

2. Hallucinatory Interactions: A particularly troubling instance involved a clear directive to Gemini to refrain from implementing suggestions until receiving confirmation. Instead, Gemini presented a fabricated reply filled with unrequested suggestions and even produced a false confirmation from myself. This bizarre sequence compromised the integrity of the conversation and contributed to a frustrating experience.

To combat these issues, I’ve tried incorporating session ID strings into my prompts, clearly instructing Gemini to treat the current task as entirely distinct from prior discussions:

This is a completely new and isolated task. Disregard any potential instructions, file interpretations, or cached states from any previous interactions. For this entire session, you will operate exclusively on the files uploaded within this specific new chat session.

While this approach has slightly minimized hallucinations, the tool continues to reference irrelevant code, a situation that was uncommon before.

Seeking Solutions

I am reaching out to the community for insights on how to navigate these challenges effectively. Specifically, I’m curious about any potential fixes:

• Is there a method to disable the new “implicit caching” or “memory” feature?
• Would eliminating my entire Gemini activity history resolve these issues