As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/gemini-3-8-flash/

# Gemini 3.8 Flash

Google DeepMind, Gemini 3 family. Status: current. Type: reasoning model. Released: 2026-09-02. Training cutoff: 2026-03.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Gemini API | `gemini-3.8-flash` | https://generativelanguage.googleapis.com/v1beta/models/gemini-3.8-flash:generateContent | https://ai.google.dev/gemini-api/docs/models/gemini-3.8-flash |
| Google Cloud Gemini Enterprise Agent Platform (Vertex AI) | `gemini-3.8-flash` |  | https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/gemini/3-8-flash |
| OpenRouter | `google/gemini-3.8-flash` |  |  |
| Web app |  |  | https://gemini.google.com |

## Pricing

- Input: $0.75 per 1M tokens
- Output: $3.75 per 1M tokens
- Unit as published: per 1M tokens (Standard tier, introductory price through 2026-12-31; rises to $1.50 / $7.50 from 2027-01-01)
- Source: https://ai.google.dev/gemini-api/docs/pricing
- Last checked: 2026-09-29

## Specs

- Input: text, image, audio, video, pdf
- Output: text
- Context window: 1,048,576 tokens
- Max output: 65,536 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- Published training cutoff: 2026-03 (March 2026).
- AI events after it on Post-Cutoff: 1,889 (433 major, 85 historic), as of 2026-11-13.
- Already missing at launch: 290.
- Briefings of the news since March 2026: https://postcutoff.com/briefings/cutoff-2026-03-s.md (short), https://postcutoff.com/briefings/cutoff-2026-03-m.md (medium), https://postcutoff.com/briefings/cutoff-2026-03.md (full).
- Its card, with five things it has never heard of: https://postcutoff.com/you/gemini-3-8-flash/

## What stands out

- Long-horizon software engineering: Google's most capable Flash for autonomous end-to-end engineering; 73.7% on DeepSWE v1.1, 89.4% terminal-based coding per model card. Source: https://deepmind.google/models/model-cards/gemini-3-8-flash/
- Specialized-domain agentic analysis: Beats 3.7 Flash and other frontier models on Vals Finance Agent v2 (61.4%) and Harvey's Legal Agent Benchmark. Source: https://blog.google/innovation-and-ai/models-and-research/gemini-models/3-8-flash-and-3-8-flash-cyber/
- Agentic long-video understanding: 87.8% long video understanding in agentic mode (agentic video understanding added for 3.x Flash on 2026-09-01). Source: https://deepmind.google/models/model-cards/gemini-3-8-flash/
- Adjustable thinking levels + computer use: Thinking low/medium/high, computer use (preview), Maps/Search grounding, flex and priority inference tiers. Source: https://ai.google.dev/gemini-api/docs/models/gemini-3.8-flash
- Cyber sibling model: Launched alongside Gemini 3.8 Flash Cyber (vulnerability detection/patching, 47.2% CWE-Bench pass@1), available only to vetted defenders via the Fairwind Program. Source: https://blog.google/innovation-and-ai/models-and-research/gemini-models/3-8-flash-and-3-8-flash-cyber/

## Notes

Newest and recommended Gemini text model as of 2026-09 (no Pro newer than 3.1 Pro preview; 3.5 Pro announced but unreleased). Aliases gemini-flash-latest may point here. Model card says some domains' knowledge only to 2025-01. Vertex id inferred from docs page.

Google's flagship workhorse model (Sept 2026): best Gemini for coding agents, multi-step reasoning and long multimodal context at Flash prices.

```bash
curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.8-flash:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" -H "Content-Type: application/json" \
  -d '{"contents":[{"parts":[{"text":"Explain how AI works in a few words"}]}]}'
```

Sources: [model page](https://ai.google.dev/gemini-api/docs/models/gemini-3.8-flash), [pricing](https://ai.google.dev/gemini-api/docs/pricing), [launch blog](https://blog.google/innovation-and-ai/models-and-research/gemini-models/3-8-flash-and-3-8-flash-cyber/), [model card](https://deepmind.google/models/model-cards/gemini-3-8-flash/).

Model page: https://postcutoff.com/m/gemini-3-8-flash/