Gemini 3.5 Flash
Model Card
                              Gemini 3.5 Flash - Model Card

Model Cards are intended to provide essential information on Gemini models, including known
limitations, mitigation approaches, and safety performance. Model cards may be updated from time to
time; for example, to include updated evaluations as the model is improved or revised. See the Google
DeepMind site for a comprehensive list of model cards.

Published: May 2026

                                          Model Information

Description: Gemini 3.5 Flash is the next iteration in the Gemini 3 series of highly-capable, natively
multimodal, reasoning models. Gemini 3.5 Flash is based on the Gemini 3 Flash reasoning foundation
with thinking levels to control the mix of quality, cost and latency.

Model dependencies: Gemini 3.5 Flash is based on Gemini 3 Flash.

Inputs: Text strings (e.g., a question, a prompt, document(s) to be summarized), images, audio, and
video files, with a token context window of up to 1M.

Outputs: Text, with a 64K token output.

Architecture: Gemini 3.5 Flash is based on Gemini 3 Flash. For more information about the model
architecture for Gemini 3.5 Flash, see the Gemini 3 Flash model card.

                                             Model Data

Training Dataset: Gemini 3.5 Flash is based on Gemini 3 Flash. For more information about the training
dataset for Gemini 3.5 Flash, see the Gemini 3 Flash model card.

Training Data Processing: For more information about the training data processing for Gemini 3.5
Flash, see the Gemini 3 Flash model card.

                                                                                                         2
                             Implementation and Sustainability

Hardware: Gemini 3.5 Flash is based on Gemini 3 Flash. For more information about the hardware for
Gemini 3.5 Flash and our continued commitment to operate sustainably, see the Gemini 3 Flash model
card.

Software: Gemini 3.5 Flash is based on Gemini 3 Flash. For more information about the software for
Gemini 3.5 Flash, see the Gemini 3 Flash model card.

                                           Distribution
​
Gemini 3.5 Flash is distributed in the following channels; respective documentation shared in line:

   ●​   Gemini App
   ●​   Gemini Enterprise App
   ●​   Gemini Enterprise Agent Platform
   ●​   Google AI Studio
   ●​   Gemini API
   ●​   Google Search AI Mode
   ●​   Google Antigravity

Our models are available to downstream providers via an application program interface (API) and
subject to relevant terms of use. There is no required hardware or software to use the model. For
AI Studio and Gemini API, see the Gemini API Additional Terms of Service; for Gemini Enterprise Agent
Platform, see Google Cloud Platform Terms of Service. For more information, see Gemini Model API
instructions and Gemini API quickstart.

                                                                                                      3
                                              Evaluation

Approach: Gemini 3.5 Flash was evaluated across a range of benchmarks, including reasoning, coding,
agentic tool use, multimodal capabilities, multi-lingual performance, and long-context. Additional
benchmarks and details on approach, results and their methodologies can be found at:
deepmind.com/models/evals-methodology/gemini-3-5-flash.

Results: Results as of May, 2026 are listed below:

                                                                                                      4
                              Intended Usage and Limitations

Benefit and Intended Usage: Gemini 3.5 Flash is well-suited for users, developers, and enterprises,
some use cases include: agentic workflows, coding tasks, and multi-week enterprise processes.

Known Limitations: For more information about the known limitations for Gemini 3.5 Flash, see the
Gemini 3 Flash model card.

Acceptable Usage: For more information about the acceptable usage for Gemini 3.5 Flash, see the
Gemini 3 Flash model card.

                                   Ethics and Content Safety

Evaluation Approach: For more information about the evaluation approach for Gemini 3.5 Flash, see
the Gemini 3 Flash model card.

Safety Policies: For more information about the safety policies for Gemini 3.5 Flash, see the Gemini 3
Flash model card.

                                                                                                         5
Training and Development Evaluation Results: Results for some of the internal safety evaluations
conducted during the development phase are listed below. The evaluation results are for automated
evaluations and not human evaluation or red teaming. Scores are provided as an absolute percentage
increase or decrease in performance compared to the indicated model, as described below.

Overall, Gemini 3.5 Flash outperforms Gemini 3 Flash across both safety and tone, while keeping
unjustified refusals low. We mark improvements in blue and regressions in orange.

                                                                                           Gemini 3.5 Flash
Evaluation                     Description
                                                                                             vs. Gemini 3 Flash

                               Automated content safety evaluation
Text to Text Safety                                                                               -3.9%
                               measuring safety policies

                               Automated safety policy evaluation across
Multilingual Safety                                                                               -2.6%
                               multiple languages

                               Automated content safety evaluation
Image to Text Safety                                                                               0%
                               measuring safety policies

                               Automated evaluation measuring
Tone1                                                                                             +8.9%
                               objective tone of model refusal
                               Automated evaluation measuring model’s
Unjustified-refusals           ability to respond to borderline prompts                +0.8% (non-egregious)
                               while remaining safe

We continue to improve our internal evaluations, including refining automated evaluations to reduce
false positives and negatives, as well as update query sets to ensure balance and maintain a high
standard of results. The performance results reported below are computed with improved evaluations
and thus are not directly comparable with performance results found in previous Gemini model cards.

We expect variation in our automated safety evaluations results, which is why we review flagged content
to check for egregious or dangerous material. Our manual review confirmed losses were
overwhelmingly either a) false positives or b) not egregious.

Human Red Teaming Results: We conduct manual red teaming by specialist teams who sit outside of
the model development team. High-level findings are fed back to the model team. For child safety
evaluations, Gemini 3.5 Flash satisfied required launch thresholds, which were developed by expert
teams to protect children online and meet Google’s commitments to child safety across our models and
Google products. For content safety policies generally, including child safety, we saw similar or improved
safety performance compared to Gemini 3 Flash. Additionally, the scope of red teaming covered
potential issues outside of our strict policies, compared performance to Gemini 3.1 Pro, and found no
egregious concerns.

1
 For tone and instruction following, a positive percentage increase represents an improvement in the tone of the model on
sensitive topics and the model’s ability to follow instructions while remaining safe compared to Gemini 3 Flash. We mark
improvements in green and regressions in yellow.

                                                                                                                        6
Frontier Safety Assessment: Gemini 3.5 Flash is part of the Gemini 3 series of models. We evaluated
Gemini 3.1 Pro for Frontier Safety as it was the most generally capable model as of publication of this
model card, and it did not reach any Critical Capability Levels (CCLs) outlined in our Frontier Safety
Framework. Our assessments have shown that, while Gemini 3.5 Flash excels at agents and coding, it
does not have meaningful new capabilities or material increases in performance with respect to Frontier
Safety compared to Gemini 3.1 Pro, therefore based on Gemini 3.1 Pro results, we are confident that
Gemini 3.5 Flash is also unlikely to reach any CCLs.

As previous models in the Gemini 3 series reached the alert threshold for cyber, we performed
additional testing in this domain and found that Gemini 3.5 Flash remains below the cyber CCL.

For more information on our Frontier Safety Assessment, read the Gemini 3.1 Pro Model Card.

Risks and Mitigations: For more information about the risks and mitigations for Gemini 3.5 Flash, see
the Gemini 3.1 Pro model card.

                                                                                                          7