Gemini 1.5 Pro
Announced Feb 15, 2024
Much longer inputs become possible
What could it do?
Process long collections of text and media within the supported context window.
What changed?
Google previewed a context window of up to one million tokens for selected developers and enterprise customers.
Long context
Longer inputs made it possible to explore much larger documents or media collections in one request.
Where it fell short
A larger input allowance is not a guarantee that every detail will be retrieved or interpreted correctly.
February 2024 announcement and limited preview, not general availability of every context length. Check sources
- Release stage
- Limited preview
- Highlighted capability
- Long context
- Preview ceiling
- Up to 1 million tokens
What this meant in practice
Context length measures input capacity. Accuracy measures whether the model uses that input correctly. Keeping those concepts separate prevents a larger context window from being mistaken for a proportional increase in intelligence.
Find evidence in a long document
Ask for the passage supporting an answer and its location. Check that quotation against the document. The useful output is an answer you can trace, not just a confident summary.
Common question
Does a million tokens mean a million words?
No. Tokens are pieces of text or other encoded input. Their relationship to words depends on the content and tokenizer.
Release facts were checked against the sources below. Performance claims belong to the developers; we have not independently tested these models. The million token context window was a limited preview at announcement.
Google: Introducing Gemini 1.5 Gemini team: Gemini 1.5 technical reportBenchmark results
A benchmark estimate, not a percentage or capability multiplier. Reasoning settings are not specified in this source table. Historical estimates can change in later snapshots.
Epoch AI methodology ↗Download the source snapshotChecked Oct 7, 2026 · CC BY 4.0One explicitly named variant per release. Scores come from the same Overall snapshot; preliminary entries and reported intervals are preserved. These are current ratings of earlier variants, not their launch day ratings.
Source: Text Arena ↗Download selected resultsChecked Oct 8, 2026