Kimi K2 Instruct vs Mistral Large 3 675B Instruct
Kimi K2 Instruct (2025) and Mistral Large 3 675B Instruct (2025) are frontier reasoning models from Moonshot AI and MistralAI. Kimi K2 Instruct ships a 131k-token context window, while Mistral Large 3 675B Instruct ships a 128k-token context window. On pricing, Mistral Large 3 675B Instruct costs $0.50/1M input tokens versus $0.57/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Mistral Large 3 675B Instruct is safer overall; choose Kimi K2 Instruct when reasoning depth matters.
Decision scorecard
Local evidence first| Signal | Kimi K2 Instruct | Mistral Large 3 675B Instruct |
|---|---|---|
| Best for | reasoning-heavy apps and provider-routed production | multimodal apps and provider-routed production |
| Decision fit | RAG, Long context, and Classification | Coding, RAG, and Agents |
| Context window | 131k | 128k |
| Cheapest output | $2.30/1M tokens | $1.50/1M tokens |
| Provider routes | 5 tracked | 5 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Kimi K2 Instruct has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Kimi K2 Instruct uniquely exposes Reasoning in local model data.
- Local decision data tags Kimi K2 Instruct for RAG, Long context, and Classification.
- Mistral Large 3 675B Instruct has the lower cheapest tracked output price at $1.50/1M tokens.
- Mistral Large 3 675B Instruct uniquely exposes Vision and Multimodal in local model data.
- Local decision data tags Mistral Large 3 675B Instruct for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Kimi K2 Instruct
$1,031
Cheapest tracked route/tier: Vercel AI Gateway
Mistral Large 3 675B Instruct
$775
Cheapest tracked route/tier: AWS Bedrock
Estimated monthly gap: $256. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on NVIDIA NIM and Vercel AI Gateway; start route-level A/B tests there.
- Mistral Large 3 675B Instruct is $0.80/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning before moving production traffic.
- Mistral Large 3 675B Instruct adds Vision and Multimodal in local capability data.
- Provider overlap exists on NVIDIA NIM and Vercel AI Gateway; start route-level A/B tests there.
- Kimi K2 Instruct is $0.80/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Vision and Multimodal before moving production traffic.
- Kimi K2 Instruct adds Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-05 | 2025-12-01 |
| Context window | 131k | 128k |
| Parameters | 1T total, 32B active (MoE) | 675B |
| Architecture | decoder only | decoder only |
| License | MIT(OSI) | Mistral License |
| Openness | Open source | Open weights |
| Commercial use | Commercial use allowed | Non-commercial only |
| Knowledge cutoff | - | 2024-11 |
Pricing and availability
| Pricing attribute | Kimi K2 Instruct | Mistral Large 3 675B Instruct |
|---|---|---|
| Input price | $0.57/1M tokens | $0.50/1M tokens |
| Output price | $2.30/1M tokens | $1.50/1M tokens |
| Providers |
Capabilities
| Capability | Kimi K2 Instruct | Mistral Large 3 675B Instruct |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | Yes | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | Yes | Yes |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: Mistral Large 3 675B Instruct, multimodal input: Mistral Large 3 675B Instruct, and reasoning mode: Kimi K2 Instruct. Both models share structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Kimi K2 Instruct lists $0.57/1M input and $2.30/1M output tokens on the cheapest tracked provider, while Mistral Large 3 675B Instruct lists $0.50/1M input and $1.50/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Mistral Large 3 675B Instruct lower by about $0.29 per million blended tokens. Availability is 5 providers versus 5, so concentration risk also matters.
Choose Kimi K2 Instruct when reasoning depth and larger context windows are central to the workload. Choose Mistral Large 3 675B Instruct when vision-heavy evaluation and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions.
FAQ
Which has a larger context window, Kimi K2 Instruct or Mistral Large 3 675B Instruct?
Kimi K2 Instruct supports 131k tokens, while Mistral Large 3 675B Instruct supports 128k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Kimi K2 Instruct or Mistral Large 3 675B Instruct?
Mistral Large 3 675B Instruct is cheaper on tracked token pricing. Kimi K2 Instruct costs $0.57/1M input and $2.30/1M output tokens. Mistral Large 3 675B Instruct costs $0.50/1M input and $1.50/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Kimi K2 Instruct or Mistral Large 3 675B Instruct open source?
Kimi K2 Instruct is listed under MIT. Mistral Large 3 675B Instruct is listed under Mistral License. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Kimi K2 Instruct or Mistral Large 3 675B Instruct?
Mistral Large 3 675B Instruct has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Kimi K2 Instruct or Mistral Large 3 675B Instruct?
Mistral Large 3 675B Instruct has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Kimi K2 Instruct and Mistral Large 3 675B Instruct?
Kimi K2 Instruct is available on Fireworks AI, Together AI, NVIDIA NIM, Vercel AI Gateway, and Novita AI. Mistral Large 3 675B Instruct is available on AWS Bedrock, NVIDIA NIM, Mistral AI Studio, Microsoft Foundry, and Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-06-04. Data sourced from public model cards and provider documentation.