Which is cheaper, Gemini 3.5 Flash-Lite and Kimi K3.1 Pro?

Gemini 3.5 Flash-Lite has the lowest input price. Per 1M input tokens: Gemini 3.5 Flash-Lite from $0.30 and Kimi K3.1 Pro from $2.00.

Can I switch between Gemini 3.5 Flash-Lite and Kimi K3.1 Pro 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 (google/gemini-3.5-flash-lite, moonshotai/kimi-k3.1-pro).

Gemini 3.5 Flash-Lite vs Kimi K3.1 Pro

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

Estimate monthly cost for these models

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

Kimi K3.1 Pro MoonshotAImoonshotai/kimi-k3.1-pro

Creator

Google

MoonshotAI

Released

Jul 21, 2026

Oct 23, 2026

Context window

1.05M

Max output

66K

1.05M

Input / 1MLowest provider price

$0.30

$2.00

Output / 1MLowest provider price

$2.50

$10.00

Providers

IntelligenceArtificial Analysis index

11.7

46.0

LatencyMedian time to first token

1.4s

—

ThroughputMedian tokens per second

<1 t/s

—

Accepts

Text, Image, Audio, Video, Files

Text, Image

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Gemini 3.5 Flash-Lite vs Kimi K3.1 Pro: summary

Gemini 3.5 Flash-Lite and Kimi K3.1 Pro are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

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.

Kimi K3.1 Pro, from MoonshotAI, has a 1,048,576-token context window, costs $2.00/1M input and $10.00/1M output tokens and scores 46.0 on the Artificial Analysis Intelligence Index.

Gemini 3.5 Flash-Lite is the cheapest on input, 6.7× cheaper than the next model and Kimi K3.1 Pro 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="google/gemini-3.5-flash-lite", messages=[...]) # or client.chat.completions.create(model="moonshotai/kimi-k3.1-pro", messages=[...])

Full API docs

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More comparisons

Benchmark scores sourced from ArtificialAnalysis