Gemini 3.1 Pro Preview Custom Tools vs Kimi K2 Thinking Turbo
Gemini 3.1 Pro Preview Custom Tools (2026) and Kimi K2 Thinking Turbo (2025) are general-purpose language models from Google DeepMind and Moonshot AI. Gemini 3.1 Pro Preview Custom Tools 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.
Kimi K2 Thinking Turbo is ~74% cheaper at $1.15/1M; pay for Gemini 3.1 Pro Preview Custom Tools only for long-context analysis.
Decision scorecard
Local evidence first| Signal | Gemini 3.1 Pro Preview Custom Tools | Kimi K2 Thinking Turbo |
|---|---|---|
| Best for | multimodal apps and long-context analysis | general production evaluation |
| Decision fit | RAG, Long context, and Vision | Long context |
| Context window | 1m | 262k |
| Cheapest output | $12/1M tokens | $8/1M tokens |
| Provider routes | 1 tracked | 1 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Gemini 3.1 Pro Preview Custom Tools has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 3.1 Pro Preview Custom Tools uniquely exposes Vision, Multimodal, and Structured outputs in local model data.
- Local decision data tags Gemini 3.1 Pro Preview Custom Tools for RAG, Long context, and Vision.
- 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.
Gemini 3.1 Pro Preview Custom Tools
$4,600
Cheapest tracked route/tier: OpenRouter
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
- No overlapping tracked provider route is sourced for Gemini 3.1 Pro Preview Custom Tools and Kimi K2 Thinking Turbo; plan for SDK, billing, or endpoint changes.
- 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 Structured outputs before moving production traffic.
- No overlapping tracked provider route is sourced for Kimi K2 Thinking Turbo and Gemini 3.1 Pro Preview Custom Tools; plan for SDK, billing, or endpoint changes.
- Gemini 3.1 Pro Preview Custom Tools is $4/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Gemini 3.1 Pro Preview Custom Tools adds Vision, Multimodal, and Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-01-01 | 2025-11-06 |
| Context window | 1m | 262k |
| Parameters | — | 1T (32B active) |
| Architecture | Decoder Only | - |
| License | Proprietary | MITOSI-approved |
| Openness | Proprietary | Open source |
| Weights | Not released | Unknown |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2025-01 | - |
Pricing and availability
| Pricing attribute | Gemini 3.1 Pro Preview Custom Tools | Kimi K2 Thinking Turbo |
|---|---|---|
| Input price | $2/1M tokens | $1.15/1M tokens |
| Output price | $12/1M tokens | $8/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 3.1 Pro Preview Custom Tools | Kimi K2 Thinking Turbo |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | No | No |
| JSON / Tool use | No | No |
| Structured outputs | Yes | No |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
Continue comparing
- Gemini 3.1 Pro Preview Custom Tools vs Mistral Nemotron
- Grok 4.3 vs Kimi K2 Thinking Turbo
- DeepSeek V4 Flash vs Kimi K2 Thinking Turbo
- Gemini 3.1 Pro Preview Custom Tools vs Kimi K2.6
- DeepSeek V4 Pro vs Kimi K2 Thinking Turbo
- Gemini 3.1 Pro Preview Custom Tools vs Qwen3.6-27B
- Gemini 3.1 Pro Preview Custom Tools vs GPT-5.5
- GPT-5.5 vs Kimi K2 Thinking Turbo
Popular comparisons for Gemini 3.1 Pro Preview Custom Tools
- Gemini 3.1 Pro Preview Custom Tools vs Kimi K2.6
- Gemini 3.1 Pro Preview Custom Tools vs Qwen3.6-27B
- Gemini 3.1 Pro Preview Custom Tools vs GPT-5.5
- Gemini 3.1 Pro Preview Custom Tools vs Xiaomi MiMo-V2.5-Pro
- Gemini 3.1 Pro Preview Custom Tools vs GPT-5.5 Pro
- Gemini 3.1 Pro Preview Custom Tools vs Qwen3-Max
Popular comparisons for Kimi K2 Thinking Turbo
Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.