Gemini 1.5 Pro brings a 1-million-token context window
Confirmed
Importance: major (4 of 5)The takeaway
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.
Status
- Claim
Confirmed
- Our reporting
- High confidence
- Importance
- Major (4 of 5)
- Last verified
- 29 September 2026
Your AI and this story
- GPT-6 AstraIn its training data
- Claude Opus 5.5In its training data
- Gemini 4 HydrogenIn its training data
- Grok 4.7In its training data
It happened before the cutoffs of all four assistants, so it can be in their training data.
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).
Sources
2 sources from 2 sites. Numbers match the chips in the text.
2 sources: 2 primary
Primary
- Our next-generation model: Gemini 1.5 (Google)blog.google, official
- Gemini 1.5: Unlocking multimodal understanding across millions of tokens of context (arXiv)arxiv.org, paper
Changes
- Filed