Gemini 2.5 Pro
Announced Mar 25, 2025
Reasoning across long and visual inputs
What could it do?
Use a thinking approach for reasoning and coding while processing text, images, audio and video.
What changed?
Google combined a stronger base model and further training with built in thinking capabilities.
Multimodal reasoning
The initial experimental release brought reasoning and a one million token context window into the same model.
Where it fell short
Results from an experimental version should not be silently assigned to a later stable version.
The March 25, 2025 experimental release, not every later Gemini 2.5 Pro version. Check sources
- Release stage
- Experimental
- Context at this release
- 1 million tokens
- Output focus
- Reasoning and code
What this meant in practice
“Thinking” describes a model’s approach, not a promise of correctness. For a useful comparison, record the exact version and the task conditions, then measure whether its answer solves the problem.
Inspect a large project
Ask which files are relevant to a bug before requesting a patch. Check the proposed file references and test the change. A large input window does not remove the need for a clear task.
Common question
Was the two million token window available at this launch?
The announcement described two million tokens as coming later; the initial release had one million.
Release facts were checked against the sources below. Performance claims belong to the developers; we have not independently tested these models.
Google: Gemini 2.5 experimental launchBenchmark 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