LLM Reference

Gemini 3.1 Pro Preview vs Kimi K2 Thinking Turbo

Gemini 3.1 Pro Preview (2026) and Kimi K2 Thinking Turbo (2025) are general-purpose language models from Google DeepMind and Moonshot AI. Gemini 3.1 Pro Preview ships a 1m-token context window, while Kimi K2 Thinking Turbo ships a 262k-token context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

Gemini 3.1 Pro Preview is safer overall; choose Kimi K2 Thinking Turbo when provider fit matters.

Decision scorecard

Local evidence first
SignalGemini 3.1 Pro PreviewKimi K2 Thinking Turbo
Best formultimodal apps, tool-calling agents, and long-context analysisgeneral production evaluation
Decision fitCoding, RAG, and AgentsLong context
Context window1m262k
Cheapest output$12/1M tokens$8/1M tokens
Provider routes5 tracked1 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose Gemini 3.1 Pro Preview when...
  • Gemini 3.1 Pro Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Gemini 3.1 Pro Preview has broader tracked provider coverage for fallback and route flexibility.
  • Gemini 3.1 Pro Preview uniquely exposes Vision, Multimodal, and JSON / Tool use in local model data.
  • Local decision data tags Gemini 3.1 Pro Preview for Coding, RAG, and Agents.
Choose Kimi K2 Thinking Turbo when...
  • Kimi K2 Thinking Turbo has the lower cheapest tracked output price at $8/1M tokens.
  • Local decision data tags Kimi K2 Thinking Turbo for Long context.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Kimi K2 Thinking Turbo

Gemini 3.1 Pro Preview

$4,600

Cheapest tracked route/tier: Google AI Studio

Kimi K2 Thinking Turbo

$2,920

Cheapest tracked route/tier: Vercel AI Gateway

Estimated monthly gap: $1,680. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Gemini 3.1 Pro Preview -> Kimi K2 Thinking Turbo
  • Provider overlap exists on Vercel AI Gateway; start route-level A/B tests there.
  • Kimi K2 Thinking Turbo is $4/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Vision, Multimodal, and JSON / Tool use before moving production traffic.
Kimi K2 Thinking Turbo -> Gemini 3.1 Pro Preview
  • Provider overlap exists on Vercel AI Gateway; start route-level A/B tests there.
  • Gemini 3.1 Pro Preview is $4/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Gemini 3.1 Pro Preview adds Vision, Multimodal, and JSON / Tool use in local capability data.

Specs

Specification
Released2026-02-192025-11-06
Context window1m262k
Parameters—1T (32B active)
ArchitectureDecoder Only-
LicenseProprietaryMITOSI-approved
OpennessProprietaryOpen source
WeightsNot releasedUnknown
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff2025-01-

Pricing and availability

Pricing attributeGemini 3.1 Pro PreviewKimi K2 Thinking Turbo
Input price
0-200,001t
$2/1M tokens
200,001t+
$4/1M tokens
$1.15/1M tokens
Output price
0-200,001t
$12/1M tokens
200,001t+
$18/1M tokens
$8/1M tokens
Providers
Google AI StudioGCP Vertex AIOpenRouterReplicate APIVercel AI Gateway
Vercel AI Gateway

Capabilities

CapabilityGemini 3.1 Pro PreviewKimi K2 Thinking Turbo
VisionYesNo
MultimodalYesNo
ReasoningNoNo
JSON / Tool useYesNo
Structured outputsYesNo
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

No shared benchmark scores are currently available for this pair.

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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.