Which is cheaper, DeepSeek V4 Pro and Gemini 3.5 Flash-Lite?

Gemini 3.5 Flash-Lite has the lowest input price. Per 1M input tokens: DeepSeek V4 Pro from $1.74 and Gemini 3.5 Flash-Lite from $0.30.

Which is smarter, DeepSeek V4 Pro and Gemini 3.5 Flash-Lite?

DeepSeek V4 Pro scores highest on the Artificial Analysis Intelligence Index: DeepSeek V4 Pro 23.1 and Gemini 3.5 Flash-Lite 11.7.

Which is faster, DeepSeek V4 Pro and Gemini 3.5 Flash-Lite?

DeepSeek V4 Pro has the highest median throughput on FastRouter: DeepSeek V4 Pro <1 t/s and Gemini 3.5 Flash-Lite <1 t/s.

Can I switch between DeepSeek V4 Pro and Gemini 3.5 Flash-Lite 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-3.5-flash-lite).

DeepSeek V4 Pro vs Gemini 3.5 Flash-Lite

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 3.5 Flash-Lite Googlegoogle/gemini-3.5-flash-lite

Creator

DeepSeek

Google

Released

Apr 24, 2026

Jul 21, 2026

Context window

1.05M

Max output

384K

66K

Input / 1MLowest provider price

$1.74$1.74–$2.40 across 3

$0.30

Output / 1MLowest provider price

$3.48$3.48–$4.80 across 3

$2.50

Providers

IntelligenceArtificial Analysis index

23.1

11.7

LatencyMedian time to first token

4.9s

1.4s

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 3.5 Flash-Lite: summary

DeepSeek V4 Pro and Gemini 3.5 Flash-Lite 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 3.5 Flash-Lite, from Google, has a 1,048,576-token context window, costs from $0.30/1M input and $2.50/1M output tokens across 2 providers and scores 11.7 on the Artificial Analysis Intelligence Index.

Gemini 3.5 Flash-Lite is the cheapest on input, 5.8× cheaper than the next model, DeepSeek V4 Pro scores highest for intelligence and DeepSeek V4 Pro has the highest throughput.

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-3.5-flash-lite", messages=[...])

Full API docs

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More comparisons

Benchmark scores sourced from ArtificialAnalysis