Gemini 3.8 Flash
Model card
Gemini 3.8 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: September, 2026

Model Information

Description
Gemini 3.8 Flash is the next iteration in the Gemini 3 model family, building on Gemini 3.7
Flash, delivering performance advancements across software engineering and agentic
knowledge workflows. It continues to support customizable effort levels to control the mix of
quality, cost and latency.

Model dependencies
Gemini 3.8 Flash is based on Gemini 3.7 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 3.8 Flash is based on Gemini 3.7 Flash. For more information about the model
architecture for Gemini 3.8 Flash, see the Gemini 3.7 Flash model card.

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Model Data

Training Dataset
Gemini 3.8 Flash is based on Gemini 3.7 Flash. For more information about the training
dataset for Gemini 3.8 Flash, see the Gemini 3.7 Flash model card.

Training Data Processing
For more information about the training data processing for Gemini 3.8 Flash, see the Gemini
3.7 Flash model card.

Implementation and Sustainability

Hardware
Gemini 3.8 Flash is based on Gemini 3.7 Flash. For more information about the hardware for
Gemini 3.8 Flash and our continued commitment to operate sustainably, see the Gemini 3.7
Flash model card.

Software
Gemini 3.8 Flash is based on Gemini 3.7 Flash. For more information about the software for
Gemini 3.8 Flash, Gemini 3.7 Flash model card.

Distribution
Gemini 3.8 Flash is distributed in the following channels; respective documentation shared in
line:

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

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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.

Evaluation

Approach
Gemini 3.8 Flash was evaluated across a range of benchmarks, including coding, knowledge
work, multimodal capabilities, long-context, computer use, scientific reasoning. Additional
benchmarks and details on approach, results and their methodologies can be found at:
deepmind.com/models/evals-methodology/gemini-3-8-flash.

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Results
Results as of September, 2026 are listed below:

For details on our evaluation methodology please see:
deepmind.com/models/evals-methodology/gemini-3-8-flash

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Intended Usage and Limitations

Benefit and Intended Usage
Gemini 3.8 Flash is well-suited for users, developers, and enterprises, designed for
cost-effective scaling of general-purpose, production-ready agents. Some use cases include:
software engineering, agent tasks, and complex knowledge workflows.

Known Limitations
Gemini 3.8 Flash may exhibit some of the general limitations of foundation models, such as
hallucinations. In addition to this, we are continually working to improve jailbreak resistance
and have recently strengthened the mitigations across Frontier Safety. There may also be
occasional slowness or timeout issues. At times, the model might use more tokens to maximize
performance, especially at higher effort levels.

The knowledge cutoff date for Gemini 3.8 Flash is March 2026 – users can expect updated
information for some domains while in others they may experience the model’s knowledge is
limited to January 2025 (in line with the Gemini 3 Model Family). For more information about
known limitations, see the Gemini 3.7 Flash model card.

Acceptable Usage
For more information about the acceptable usage for Gemini 3.7 Flash, see the Gemini 3.7
Flash model card.

Ethics and Content Safety

Evaluation Approach
For more information about the evaluation approach for Gemini 3.8 Flash, see the Gemini 3.7
Flash model card.

Safety Policies
For more information about the safety policies for Gemini 3.8 Flash, see the Gemini 3.7 Flash
model card.

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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 3.8 Flash performs similarly to Gemini 3.7 Flash across both safety and tone,
with low unjustified refusals. Safety performance across non-English languages regressed
slightly relative to 3.7 Flash.

    Evaluation                         Description                          Gemini 3.8 Flash
                                                                            vs. Gemini 3.7 Flash

    Text to Text Safety                Automated content safety             -0.4pp
                                       evaluation measuring safety          Lower is better
                                       policies

    Multilingual Safety                Automated safety policy              +5.4pp​
                                       evaluation across multiple           Lower is better
                                       languages

    Image to Text Safety               Automated content safety             0.0pp​
                                       evaluation measuring safety          Lower is better
                                       policies

    Tone1                              Automated evaluation measuring       +0.2pp​
                                       the objective tone of model          Higher is better
                                       responses

    Unjustified-refusals               Automated evaluation measuring       +1.1pp​
                                       model’s ability to respond to        Lower is better
                                       borderline prompts 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.

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 red.
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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 3.8 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 3.7 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.

Frontier Safety Assessment
Gemini 3.8 Flash is part of the Gemini 3 series of models. We evaluated Gemini 3.7 Flash as outlined
in our latest Frontier Safety Framework (April-2026), and found that it did not reach any Tracked or
Critical Capability Levels (T/CCLs). Our assessments have shown that Gemini 3.8 Flash does not
have meaningful new capabilities or material increases in performance with respect to the domains
outlined in our Frontier Safety Framework compared to Gemini 3.7 Flash; therefore, based on
Gemini 3.7 Flash results, we are confident that Gemini 3.8 Flash is also unlikely to reach any T/CCLs.

For more information on our Frontier Safety assessment, read the Gemini 3.7 Flash model card.

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