Which is cheaper, DeepSeek V4 Pro and Gemini 3.8 Flash?

Gemini 3.8 Flash has the lowest input price. Per 1M input tokens: DeepSeek V4 Pro from $1.74 and Gemini 3.8 Flash from $0.75.

Which is smarter, DeepSeek V4 Pro and Gemini 3.8 Flash?

Gemini 3.8 Flash scores highest on the Artificial Analysis Intelligence Index: DeepSeek V4 Pro 23.1 and Gemini 3.8 Flash 30.5.

Can I switch between DeepSeek V4 Pro and Gemini 3.8 Flash without changing my code?

Yes. All of them are served through FastRouter's OpenAI-compatible API, so switching is a change of the model parameter (deepseek/deepseek-v4-pro, google/gemini-3.8-flash).

DeepSeek V4 Pro vs Gemini 3.8 Flash

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Estimate monthly cost for these models

DeepSeek V4 Pro DeepSeekdeepseek/deepseek-v4-pro

Gemini 3.8 Flash Googlegoogle/gemini-3.8-flash

Creator

DeepSeek

Google

Released

Apr 24, 2026

Sep 2, 2026

Context window

1.05M

Max output

384K

66K

Input / 1MLowest provider price

$1.74$1.74–$2.40 across 3

$0.75

Output / 1MLowest provider price

$3.48$3.48–$4.80 across 3

$3.75

Providers

IntelligenceArtificial Analysis index

23.1

30.5

LatencyMedian time to first token

4.9s

—

ThroughputMedian tokens per second

<1 t/s

—

Accepts

Text

Text, Image, Audio, Video, Files

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

DeepSeek V4 Pro vs Gemini 3.8 Flash: summary

DeepSeek V4 Pro and Gemini 3.8 Flash are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

DeepSeek V4 Pro, from DeepSeek, has a 1,048,576-token context window, costs from $1.74/1M input and $3.48/1M output tokens across 3 providers and scores 23.1 on the Artificial Analysis Intelligence Index.

Gemini 3.8 Flash, from Google, has a 1,048,576-token context window, costs from $0.75/1M input and $3.75/1M output tokens across 2 providers and scores 30.5 on the Artificial Analysis Intelligence Index.

Gemini 3.8 Flash is the cheapest on input, 2.3× cheaper than the next model and Gemini 3.8 Flash scores highest for intelligence.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="deepseek/deepseek-v4-pro", messages=[...]) # or client.chat.completions.create(model="google/gemini-3.8-flash", messages=[...])

Full API docs

Frequently asked questions

More comparisons

Benchmark scores sourced from ArtificialAnalysis