# Gemini 3.8 Flash

> Google's newest Flash tier, GA 2026-09-02 — significant gains over 3.7 Flash on software engineering and agentic tasks. 1M context, 64K output, text, image, audio, video and file input, reasoning, tool calling, structured outputs.

Human version: https://kymaapi.com/models/gemini-3.8-flash
Live JSON: `GET https://kymaapi.com/v1/models` (no auth required)

## Facts

- **Model ID**: `gemini-3.8-flash`: pass this as `model` in the request body
- **Creator**: Google
- **Released**: 2026-09-02
- **Context window**: 1M tokens
- **Max output**: 66K tokens per response, a hard ceiling, not a default
- **Price**: $1.013 in / $5.063 out per 1M, prompt caching supported (cached rate not published)
- **Capabilities**: tools, vision, reasoning, caching

## Call it

```bash
curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer $KYMA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gemini-3.8-flash", "messages": [{"role": "user", "content": "Hello"}]}'
```

## Positioning

Google's newest Flash tier, generally available since September 2, 2026 — the same 1M-token context and 64K output ceiling as 3.7 Flash, at the same list rate, with Google's largest Flash-to-Flash gains on software engineering and agentic tasks.

## About

Gemini 3.8 Flash is Google's September 2026 Flash-tier release. It accepts text, image, audio, video and file input and returns text, with reasoning, tool calling and structured outputs on one request. Google's model card puts the knowledge cutoff at March 2026.

Against 3.7 Flash the shape is unchanged — 1,048,576 tokens of context and 65,536 tokens of output — and the difference is quality: Google positions it as its most intelligent Flash model, with the biggest gains on software engineering, long-horizon agentic work and multimodal understanding.

On Kyma it serves through an OpenAI-compatible endpoint with automatic failover to a second independent route. Prompt caching is supported and repeated prefixes bill at this model's cached input rate. Every response carries the exact request cost in usage.cost and names the model that answered in the X-Kyma-Model header.

## Use cases

- **Agentic coding at Flash cost**, Multi-step tool use over a large repository, with reasoning and structured outputs, at the Flash tier's price and latency.
- **Long-form structured extraction**, Reads a 1M-token corpus and emits tens of thousands of tokens of schema-constrained JSON in a single response.
- **Whole-document translation and rewriting**, The 64K output ceiling fits an entire long document's rewritten text without splitting the job into chunks.
- **Multimedia review**, Takes video, audio, images and files alongside a text prompt and returns a long written analysis in one pass.

## Not ideal for

Do not reach for this when a short reply is all you need and cost is the deciding factor — the cheaper Flash tiers answer the same short prompts, and the large output ceiling buys nothing you will use.

## Pick something else when

- You need the cheapest 1M-context tier and replies stay short → `gemini-3.5-flash-lite`
- You want the previous Flash generation at the same list rate → `gemini-3.7-flash`
- You need a frontier-tier model rather than a Flash tier → `claude-fable-5.1`, `gpt-5.6-sol`

## See also

- All models: https://kymaapi.com/models.md
- Pricing: https://kymaapi.com/pricing.md
- Other models by Google: https://kymaapi.com/models?q=Google