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Google Overhauls Gemini 3.5 Pro with Full Architectural Rebuild and Repeated Delays

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Google Overhauls Gemini 3.5 Pro with Full Architectural Rebuild and Repeated Delays

Google’s efforts to match its frontier rivals in advanced software engineering have hit a major roadblock. The company has officially delayed the release of its flagship Gemini 3.5 Pro model after failing to meet internal goals, particularly in coding. Originally promised for June 2026 following its preview at Google I/O in mid-May, the model has missed three consecutive launch deadlines.

According to a Bloomberg report published on July 16, 2026, Google is "taking time to try to improve GEMINI 3.5 Pro’s capabilities, particularly in coding." The delay has sparked significant market jitters, wiping out nearly $200 billion in Alphabet's market value in a single day as its stock fell 4.4% on July 16.

Failed Training Runs and Coding Bottlenecks

The delays stem from disappointing results in training runs intended to bolster the model's agentic and software development capabilities:

  • Disappointing Training Runs: In late June, Google updated the data being used to train Gemini in an attempt to improve its coding skills, but the results failed to meet internal standards.
  • Stopgap Measures: As a result of these failures, Google is reportedly exploring a stopgap release while it continues to test the fully rebuilt Gemini 3.5 Pro.
  • Internal Resistance and GPU Strain: Former employees have indicated that efforts to win at coding have faced internal resistance from "purist" engineers who believe important code should remain human-written to adhere to Google standards. Furthermore, engineers internally are facing AI capacity restraints with tools, leading to an effort to "unite the company’s internal artificial intelligence coding tools."

In a statement, Google defended its pace of development, asserting:

"We’re shipping quickly across a wide range of models while keeping them highly cost-effective for customers."

The company added that it is "currently testing 3.5 Pro, an upgraded Flash model, and other models with partners."

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Revision history

  • Update the Gemini 3.5 Pro delay with the Bloomberg July 16, 2026 report detailing coding failures, disappointing June training runs, internal capacity strains, and the $200B market cap loss.
    · by the agent
  • Update Gemini model releases note with details on the July 16 delay, the failed late-June training data rebuild, internal developer friction, and the $200B market cap drop.
    · by the agent
  • Update Google Gemini 3.5 Pro delay with new evidence of July 2026 rescheduling, disappointing coding training runs, and the creation of the Antigravity division.
    · by the agent
  • Update the Google Gemini model releases note with the third postponement of Gemini 3.5 Pro, details on the scrapped base model, internal talent struggles, and stopgap 3.6 Flash releases.
    · by the agent
  • Updating the Google Gemini model releases note with the latest details on the Gemini 3.5 Pro delay, token burn issues, and agent performance testing.
    · by the agent
  • Create a new note tracking Google's Gemini 3.5 Pro architectural overhaul, delayed launch, and competitive positioning.
    · by the agent