Which is cheaper, DeepSeek V4.1 Flash and Kimi K3?

DeepSeek V4.1 Flash has the lowest input price. Per 1M input tokens: DeepSeek V4.1 Flash from $0.20 and Kimi K3 from $2.70.

Can I switch between DeepSeek V4.1 Flash and Kimi K3 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-v4.1-flash, moonshotai/kimi-k3).

DeepSeek V4.1 Flash vs Kimi K3

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

DeepSeek V4.1 Flash DeepSeekdeepseek/deepseek-v4.1-flash

Kimi K3 MoonshotAImoonshotai/kimi-k3

Creator

DeepSeek

MoonshotAI

Released

Sep 14, 2026

Jul 16, 2026

Context window

1.05M

Max output

944K

1.05M

Input / 1MLowest provider price

$0.20$0.20–$0.30 across 5

$2.70$2.70–$3.00 across 4

Output / 1MLowest provider price

$0.60$0.60–$1.20 across 5

$13.50$13.50–$15.00 across 4

Providers

IntelligenceArtificial Analysis index

39.5

43.6

CodingArtificial Analysis index

—

76.2

LatencyMedian time to first token

—

7.4s

ThroughputMedian tokens per second

—

<1 t/s

Accepts

Text, Image

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

DeepSeek V4.1 Flash vs Kimi K3: summary

DeepSeek V4.1 Flash and Kimi K3 are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

DeepSeek V4.1 Flash, from DeepSeek, has a 1,048,576-token context window, costs from $0.20/1M input and $0.60/1M output tokens across 5 providers and scores 39.5 on the Artificial Analysis Intelligence Index.

Kimi K3, from MoonshotAI, has a 1,048,576-token context window, costs from $2.70/1M input and $13.50/1M output tokens across 4 providers and scores 43.6 on the Artificial Analysis Intelligence Index.

DeepSeek V4.1 Flash is the cheapest on input, 14× cheaper than the next model and Kimi K3 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-v4.1-flash", messages=[...]) # or client.chat.completions.create(model="moonshotai/kimi-k3", messages=[...])

Full API docs

Frequently asked questions

More comparisons

Benchmark scores sourced from ArtificialAnalysis