---
id: "2024-02-15-gemini-1-5"
url: "https://postcutoff.com/e/2024-02-15-gemini-1-5/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2024-02-15"
date_precision: day
category: model-release
importance: 4
confidence: high
status: [Confirmed]
sources: 2
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2024-02-15-gemini-1-5/

# Gemini 1.5 Pro brings a 1-million-token context window

Google announced Gemini 1.5 Pro, a mixture-of-experts model with a context window of up to 1 million tokens in production preview (10M tested in research), able to process hours of video or entire codebases in a single prompt.

## Key facts
- Announced 15 February 2024
- Standard 128K context; up to 1M tokens for early testers
- Research tests up to 10M tokens with near-perfect needle-in-a-haystack recall
- Mixture-of-experts architecture
- Context expanded to 2M tokens for developers in mid-2024

## What happened

Google shipped a model that could reason over ~700K words, an hour of video or 11 hours of audio at once.

## Why it matters

Made million-token context a practical reality and shifted how developers used LLMs (whole-document and whole-repo prompting).

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): in its training data
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): in its training data
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [Our next-generation model: Gemini 1.5 (Google)](https://blog.google/technology/ai/google-gemini-next-generation-model-february-2024/) (blog.google, official)
2. [Gemini 1.5: Unlocking multimodal understanding across millions of tokens of context (arXiv)](https://arxiv.org/abs/2403.05530) (arxiv.org, paper)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2024-12-11: [Google launches Gemini 2.0 for the 'agentic era'](https://postcutoff.com/e/2024-12-11-gemini-2/index.md)
- 2023-12-06: [Google DeepMind launches Gemini 1.0](https://postcutoff.com/e/2023-12-06-gemini-1/index.md)