Which is cheaper, Kimi K3.1 Pro and Inkling Small?

Inkling Small has the lowest input price. Per 1M input tokens: Kimi K3.1 Pro from $2.00 and Inkling Small from $0.45.

Which has the larger context window, Kimi K3.1 Pro and Inkling Small?

Kimi K3.1 Pro has the largest context window: Kimi K3.1 Pro 1,048,576 tokens and Inkling Small 524,288 tokens.

Which is smarter, Kimi K3.1 Pro and Inkling Small?

Kimi K3.1 Pro scores highest on the Artificial Analysis Intelligence Index: Kimi K3.1 Pro 46.5 and Inkling Small 12.9.

Can I switch between Kimi K3.1 Pro and Inkling Small 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 (moonshotai/kimi-k3.1-pro, thinkingmachines/inkling-small).

Kimi K3.1 Pro vs Inkling Small

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

Estimate monthly cost for these models

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

Inkling Small Thinking Machinesthinkingmachines/inkling-small

Creator

MoonshotAI

Thinking Machines

Released

Oct 23, 2026

Jul 30, 2026

Context window

1.05M

524K

Max output

1.05M

262K

Input / 1MLowest provider price

$2.00

$0.45

Output / 1MLowest provider price

$10.00

$1.20

Providers

IntelligenceArtificial Analysis index

46.5

12.9

Accepts

Text, Image

Text, Image, Audio

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

Kimi K3.1 Pro vs Inkling Small: summary

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

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 46.5 on the Artificial Analysis Intelligence Index.

Inkling Small, from Thinking Machines, has a 524,288-token context window, costs $0.45/1M input and $1.20/1M output tokens and scores 12.9 on the Artificial Analysis Intelligence Index.

Inkling Small is the cheapest on input, 4.4× cheaper than the next model, Kimi K3.1 Pro has the largest context window 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="moonshotai/kimi-k3.1-pro", messages=[...]) # or client.chat.completions.create(model="thinkingmachines/inkling-small", messages=[...])

Full API docs

Frequently asked questions

More comparisons

Benchmark scores sourced from ArtificialAnalysis