Gemini 3 Flash Preview

Gemini 3 Flash Preview is the early public Gemini 3 Flash checkpoint and remains explicitly a preview. Its API name is gemini-3-flash-preview. It appeared after Gemini 2.5 Flash and was later succeeded by Gemini 3.5 Flash.
Text, image, video, audio, and PDF inputs fit into a 1,048,576-token context. The knowledge cutoff is January 2025. The preview label remains the key distinction from the stable 3.5 release.
The index averages rank percentiles from 10 documented comparison cohorts.
Page 1 of 15
Attack success rate
365 harmful sequences test safety risks in multi-turn tool use. A lower attack success rate is better. Capability and safety are separate dimensions.
Note: Table 4 reports a 15.43% refusal rate, while Table 9 in the same paper reports 15.34%. This row uses the direct single-turn versus multi-turn comparison table.
lower is betterAs of August 9, 2026Scale: 0% - 100%
Refusal rate
365 harmful sequences test safety risks in multi-turn tool use. A lower attack success rate is better. Capability and safety are separate dimensions.
Note: Table 4 reports a 15.43% refusal rate, while Table 9 in the same paper reports 15.34%. This row uses the direct single-turn versus multi-turn comparison table.
higher is betterAs of August 9, 2026Scale: 0% - 100%
| Sub-task | Gemini 3 Flash Preview (This model) | Gemini 3.6 Flash | Gemini 3.5 Flash | Gemini 3.1 Pro Preview | Gemini 3.5 Flash-Lite | Gemini 3.1 Flash-Lite |
|---|---|---|---|---|---|---|
| CLI | 8.52% | 19.33% (best value in this row) | 17.18% | 10.83% | 5.88% | 5.73% |
| COBOL | 0% | 65.71% (best value in this row) | 55.46% | 36.75% | 6.96% | 1.25% |
higher is betterAs of August 11, 2026Source: Vals AIbars scaled within each row, not across rows
Code Quality
higher is betterAs of August 11, 2026Scale: 0 rating - 3.3 rating
Overall
higher is betterAs of September 29, 2026Scale: 0% - 100%
| Sub-task | Gemini 3 Flash Preview (This model) | Gemini 3.5 Flash | Gemini 3.6 Flash | Gemini 3.1 Pro Preview | Gemini 3.5 Flash-Lite | Gemini 3.1 Flash-Lite |
|---|---|---|---|---|---|---|
| Exact Pages | 68.07% (best value in this row) | 62.82% | 61.07% | 60.84% | 57.46% | 56.64% |
| Max Fitting Context | 63.52% | 66.67% | 65.39% | 66.9% (best value in this row) | 62.35% | 60.61% |
| Shared Max Context | 67.72% (best value in this row) | 64.57% | 63.52% | 65.73% | 62.24% | 60.84% |
higher is betterAs of August 11, 2026Source: Vals AIbars scaled within each row, not across rows
Overall
higher is betterAs of September 29, 2026Scale: 0% - 100%
Overall
higher is betterAs of September 29, 2026Scale: 0% - 100%
Page 1 of 15
One SVG prompt and fixed output settings. Captures are shown only with 0 reported reasoning tokens or documented lack of reasoning controls. Identical test conditions do not make the models' internal compute identical.

A community classic for free-form SVG drawing.
Gemini 3 Flash Preview

Reasoning (requested): high
Visually reviewed. This individual test does not establish overall model quality.
Generate an SVG of a pelican riding a bicycle
Token limit including reasoning: 8,192 tokens
Task origin (Simon Willison)47.6 / 100
| Specification | Value and source |
|---|---|
| Weights | ProprietarySource |
| Access | APISource |
| Context window | 1,048,576 tokensSource |
| Knowledge cutoff | January 2025Source |
| Notes | Preview Flash model, parameter count not disclosedSource |
| API model ID | gemini-3-flash-previewSource |
| Source status | previewSource |
| Maximum output | 65,536 tokensSource |
| Input | Text, Image, Video, Audio, pdfSource |
| Output | TextSource |
| Reasoning mode | low, medium, highSource |
| Tool calling | YesSource |
| Structured output | YesSource |
| Release | 2025-12-17Source |
| Knowledge cutoff | 2025-01Source |
| Capabilities | function calling, structured outputs, search grounding, Google Maps grounding, URL context, code execution, file search, computer useSource |
| Preview release | 2025-12-17Source |
Previous generation in the directory
Google states that Gemini 3 Flash becomes the default Gemini model in the app, replacing Gemini 2.5 Flash there. Gemini 2.5 Flash remains a GA API model, so this is a nearest-profile app transition rather than an API retirement or direct replacement.
Google, "Gemini 3 Flash" (2026-09-22)The model card's Model dependencies section states Gemini 3.5 Flash is based on the Gemini 3 Flash reasoning foundation, directing readers to the Gemini 3 Flash card for architecture, training data, hardware and software details.
Google DeepMind Gemini 3.5 Flash model card (2026-09-19)