Gemini 3.8 Flash API Pricing & Monthly Cost Simulator
Verified 2026 unit economics for Google Gemini 3.8 Flash (google/gemini-3.8-flash): $0.825/1M uncached input, $0.083/1M cached prefix read, and $4.125/1M output across a 1,048,576-token context window (released 2026-09-02).
Uncached Input (/1M)
$0.825
Cached Prompt Read (/1M)
$0.083 (-90%)
Output Completion (/1M)
$4.125
50% Batch API (In / Out)
$0.412 / $2.063
Interactive 30-Day Monthly Spend Simulator
Live Unit-Cost & Prompt Cache Slider (Gemini 3.8 Flash)
google/gemini-3.8-flash
Estimated 30-day spend
$153.45/mo
Cost per 1,000 calls
$5.1150
Monthly savings vs 0% cache
$44.55/mo
Technical Limits & API Capabilities
Context window
1,048,576
Max output tokens
65,536
Workload tier
Coding & Agent
Input modalities
text, image, video, file, audio
Tool Calling: Yes
JSON Schema Strict: Yes
Reasoning Tokens: Supported
50% Batch API: Available
Same-Category 2026 Model Alternatives (Coding & Agent)
| Model | Provider | Input / Cached ($/1M) | Output ($/1M) | Context / Max Out |
|---|---|---|---|---|
| Gemini 3.8 Flash | $0.825 / $0.083 | $4.125 | 1,048,576 / 65,536 | |
| Gemini 4 Hydrogen | $1.5 / $0.075 | $7.5 | 1,048,576 / 943,718 | |
| Gemini 4 Carbon | $2 / $0.1 | $10 | 1,048,576 / 943,718 | |
| Muse Ember | Meta | $0.1 / $0.004 | $0.5 | 1,048,576 / 943,718 |
| GPT-6.1 Terra | OpenAI | $1 / $0.05 | $5 | 1,050,000 / 128,000 |
| MiniMax M3.1 Flash | MiniMax | $0.15 / $0.015 | $0.6 | 1,048,576 / 524,288 |
| Muse Spark Open | Meta | $1.25 / $0.15 | $4.25 | 1,048,576 / 943,718 |
Head-to-Head Matchups Featuring Gemini 3.8 Flash
- Gemini 4 Argon vs Gemini 3.8 Flash — $2 vs $0.825 / 1M
- Gemini 3.8 Flash vs Claude Haiku 5.5 — $0.825 vs $0.1 / 1M
Frequently Asked Questions
How much does Gemini 3.8 Flash cost per 1 million tokens in 2026?
Gemini 3.8 Flash by Google is billed at $0.825 per 1M uncached input tokens, $0.083 per 1M cached input read tokens (90% cache discount), and $4.125 per 1M output tokens.
What are the context window and max output token limits for Gemini 3.8 Flash?
Gemini 3.8 Flash supports a 1,048,576-token input context window and up to 65,536 completion output tokens per request, accepting text, image, video, file, audio inputs.
Does Gemini 3.8 Flash support strict JSON Schema outputs, tool calling, and Batch API?
Gemini 3.8 Flash capability profile: tool calling = Supported, strict JSON Schema structured outputs = Supported, reasoning mode = Supported, and 50% asynchronous Batch API = Supported.