Gemini 4 Argon 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
Metric
Gemini 4 ArgonGooglegoogle/gemini-4-argon
Kimi K3.1 ProMoonshotAImoonshotai/kimi-k3.1-pro
Creator
Google
MoonshotAI
Released
Oct 13, 2026
Oct 23, 2026
Context window
1.05M
1.05M
Max output
66K
1.05M (best)
Input / 1MLowest provider price
$2.00
$2.00
Output / 1MLowest provider price
$10.00
$10.00
Providers
2 (best)
1
IntelligenceArtificial Analysis index
50.4 (best)
46.0
Accepts
Text, Image, Audio, Video, Files
Text, Image
Produces
Text
Text
Tool calling
Yes
Yes
Structured output
No
Yes
Reasoning
No
No

Gemini 4 Argon vs Kimi K3.1 Pro: summary

Gemini 4 Argon 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 4 Argon, from Google, has a 1,048,576-token context window, costs from $2.00/1M input and $10.00/1M output tokens across 2 providers and scores 50.4 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 4 Argon 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-4-argon", messages=[...]) # or client.chat.completions.create(model="moonshotai/kimi-k3.1-pro", messages=[...])
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Benchmark scores sourced from ArtificialAnalysis