Which is cheaper, Kimi K3 and GPT-6.1 Sol?

GPT-6.1 Sol has the lowest input price. Per 1M input tokens: Kimi K3 from $2.70 and GPT-6.1 Sol from $2.00.

Which has the larger context window, Kimi K3 and GPT-6.1 Sol?

GPT-6.1 Sol has the largest context window: Kimi K3 1,048,576 tokens and GPT-6.1 Sol 1,050,000 tokens.

Which is smarter, Kimi K3 and GPT-6.1 Sol?

GPT-6.1 Sol scores highest on the Artificial Analysis Intelligence Index: Kimi K3 43.6 and GPT-6.1 Sol 51.8.

Can I switch between Kimi K3 and GPT-6.1 Sol 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, openai/gpt-6.1-sol).

Kimi K3 vs GPT-6.1 Sol

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

Kimi K3 MoonshotAImoonshotai/kimi-k3

GPT-6.1 Sol OpenAIopenai/gpt-6.1-sol

Creator

MoonshotAI

OpenAI

Released

Jul 16, 2026

Sep 29, 2026

Context window

1.05M

Max output

1.05M

128K

Input / 1MLowest provider price

$2.70$2.70–$3.00 across 4

$2.00

Output / 1MLowest provider price

$13.50$13.50–$15.00 across 4

$10.00

Providers

IntelligenceArtificial Analysis index

43.6

51.8

CodingArtificial Analysis index

76.2

—

LatencyMedian time to first token

7.4s

—

ThroughputMedian tokens per second

<1 t/s

—

Accepts

Text, Image

Text, Image, Files

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

Kimi K3 vs GPT-6.1 Sol: summary

Kimi K3 and GPT-6.1 Sol 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, 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.

GPT-6.1 Sol, from OpenAI, has a 1,050,000-token context window, costs $2.00/1M input and $10.00/1M output tokens and scores 51.8 on the Artificial Analysis Intelligence Index.

GPT-6.1 Sol is the cheapest on input, 1.4× cheaper than the next model, GPT-6.1 Sol has the largest context window and GPT-6.1 Sol 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", messages=[...]) # or client.chat.completions.create(model="openai/gpt-6.1-sol", messages=[...])

Full API docs

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More comparisons

Benchmark scores sourced from ArtificialAnalysis