CatalogGoogle
Gemini 3.5 Flash
gemini-3.5-flash
51Index
ClosedGenerally available1M contextTextImageAudioVideo
Pick this when
Existing Gemini 3.5 traffic that has not moved.
Skip when
You can call 3.7 Flash. Same family, better score, promotional rate.
Previous Flash workhorse. Keep for compatibility, not as a new default.
Price
- Input / 1M
- $0.75
- Output / 1M
- $4.50
- Measured task
- $0.48
Still listed. Prefer 3.7 unless a pin requires 3.5.
Shape
- Context
- 1M
- Max output
- 64K
- Released
- 2026-05
- Tools
- Yes
- Reasoning
- Yes
Scores
Intelligence index51
GPQA Diamond79
Terminal-Bench 2.164
Agentic index31
- Arena
- —
- Speed
- 250/s
- GPQA
- 79.2%
- Term.
- 64.1%
- AA Index. The single number most people mean by “how smart.” It is a blend, so a specialist can lose here and still win the job you care about.
- GPQA. A clean test of hard reasoning. PhD experts sit around 65%. It says little about writing, tools, or taste.
- Term.. Closest public proxy for coding agents that live in a terminal. A high index score with a weak terminal score is a warning.
- Arena. Captures taste and usefulness that unit tests miss. Sample size varies by model, so treat gaps under ~100 Elo as noise.
Google · Mountain View. Gemini is natively multimodal. 3.7 Flash is the current pick for mixed media and long documents. 3.5 Pro is still slipping.