KymaKyma
Google

Google

Gemini 3.8 Flash

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.

Modalities

Text+Image → Text

Below release

Not established

Weights

Not published

Where it sits in the catalogue Kyma measures

Every number against every text model Kyma prices per token — a stated rule, not a chosen line-up.

Price · input#37/70

$1.013

output $5.063

median $0.977 · best $0.0494

Price · output#44/70

$5.063

per 1M tokens generated

median $3.531 · best $0.2164

Availability · 30d—

Not measured yet

7 observations since 2026-09-03

median 96.2% · best 100.0%

Throughput—

Not measured

probe median, one fixed prompt

median 40.8 tok/s · best 308.3 tok/s

Response time—

Not measured

probe median, to a complete answer

median 2.50 s · best 0.52 s

Context

1.05M

max output 65,536

published by Google, not measured here

Tick above each rail is this model, below it the other 69. Dashed rule is the field median, solid is its best. Better is left; the axis stops at the 90th percentile, so a few models sit past its right edge.

Usage

How much this model is actually called here.

Rank

#110

of 113 active models

Tokens served

22

all-time

Platform share

0.0%

of all tokens

Pricing

Pay per token. Cached input bills at this model’s own cached rate, listed below.

$1.013$2.026 /1M input$5.063$10.126 /1M output
50% off· ends Sep 10Returns to $2.026 /1M input and $10.126 /1M output on Sep 10.
Hobby10 req/day · 2K in / 500 out
~$1.37/mo
Production1,000 req/day · 2K in / 500 out
~$137/mo
Scale20,000 req/day · 2K in / 500 out
~$2,735/mo
+ Estimate your workload
1,000
2,000
500

Estimated monthly cost

$137

$4.56 / day on Gemini 3.8 Flash

Same workload on:

Gemini 3.5 Flash Lite$74.92-45%
Gemini 3.1 Pro$405+196%

Estimates use list pricing. Actual bills depend on real token counts, and every response includes its exact cost.

When to use Gemini 3.8 Flash

Updated 2026-09-03

Where this model earns its cost — and where it doesn't.

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.

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.

How it compares

Against the peers people actually weigh it against.

SpecGemini 3.8 FlashGemini 3.5 Flash LiteGemini 3.1 Pro
Input /1M$1.013$0.405$2.70
Output /1M$5.063$3.375$16.20
Context1M1M1M
ToolsYesYesYes
ReasoningYesYesYes
ThroughputNot measured56.6 tok/s95.5 tok/s

Quick start

Up and running in under two minutes.

  1. 1

    Create an API key

    Sign up and grab a key from the dashboard — $0.50 free credit, no card required.

    Get API key →
  2. 2

    Make your first request

    Drop in your key and send a chat completion — fully OpenAI-compatible.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-3.8-flash",
    "messages": [
      {"role": "user", "content": "Explain prompt caching in one paragraph."}
    ]
  }'
  3. 3

    Stream responses

    Add "stream": true to receive tokens as they arrive.

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

FAQ

Common questions about this model.

What is the context window of Gemini 3.8 Flash?

Gemini 3.8 Flash has a 1M-token context window — roughly 1542 pages of text in a single request.

How much does the Gemini 3.8 Flash API cost?

$1.013 per 1M input tokens and $5.063 per 1M output tokens (on offer until Sep 10, then $2.026/$10.126). No subscription; you pay only for what you use.

Does Gemini 3.8 Flash support function calling?

Yes — Gemini 3.8 Flash supports tool/function calling and structured outputs (JSON mode), so it works with agent frameworks out of the box.

Are the weights for Gemini 3.8 Flash publicly available?

No. Google does not publish Gemini 3.8 Flash's weights — it is reachable through an API rather than as a file you can download and run (https://deepmind.google/models/model-cards/gemini-3-8-flash/, read 2026-09-03). That is Google's decision about their own product, not a limitation of Kyma.

Is Gemini 3.8 Flash ever served below the precision its creator released it at?

Kyma cannot say, and for this model nobody can. Google does not publish Gemini 3.8 Flash's weights, so there is no released checkpoint whose precision a route could be measured against. We publish "not established" rather than reading a low format as a downgrade: on several models in this catalogue a low format is exactly how the creator ships it.

How do I use Gemini 3.8 Flash?

Kyma is OpenAI-compatible: point your SDK's base URL at https://kymaapi.com/v1, use your Kyma API key, and set the model to gemini-3.8-flash. Signing up is free and includes $0.50 of credit — no card required.

How is this different from Gemini 3.7 Flash?

Same context (1M tokens), same output ceiling (64K), same input set and same list price. The difference is the model itself: Google reports its largest Flash-to-Flash gains on software engineering and agentic tasks. If 3.7 Flash already does the job, nothing forces a move; new work should start on 3.8.

Is the current price permanent?

No. Google publishes a launch rate through December 31, 2026 and a higher list rate after that; the Pricing table on this page shows the promotional rate, the date it is promised through, and the list rate it returns to.

Does prompt caching work on this model?

Yes. Repeated prompt prefixes bill at this model's cached input rate, and the saving is reported per request in usage.cache_discount.

Start with $0.50 free credit — no card required.Create account →

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