Kimi K2 Thinking Turbo vs Mistral Magistral Small 2509
Kimi K2 Thinking Turbo (2025) and Mistral Magistral Small 2509 (2025) are general-purpose language models from Moonshot AI and MistralAI. Kimi K2 Thinking Turbo ships a 262k-token context window, while Mistral Magistral Small 2509 ships a not-yet-sourced context window. On pricing, Mistral Magistral Small 2509 costs $0.50/1M input tokens versus $1.15/1M 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 Magistral Small 2509 is ~130% cheaper at $0.50/1M; pay for Kimi K2 Thinking Turbo only for provider fit.
Decision scorecard
Local evidence first| Signal | Kimi K2 Thinking Turbo | Mistral Magistral Small 2509 |
|---|---|---|
| Best for | general production evaluation | provider-routed production |
| Decision fit | Long context | General |
| Context window | 262k | — |
| Cheapest output | $8/1M tokens | $1.50/1M tokens |
| Provider routes | 1 tracked | 2 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Kimi K2 Thinking Turbo has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Local decision data tags Kimi K2 Thinking Turbo for Long context.
- Mistral Magistral Small 2509 has the lower cheapest tracked output price at $1.50/1M tokens.
- Mistral Magistral Small 2509 has broader tracked provider coverage for fallback and route flexibility.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Kimi K2 Thinking Turbo
$2,920
Cheapest tracked route/tier: Vercel AI Gateway
Mistral Magistral Small 2509
$775
Cheapest tracked route/tier: AWS Bedrock
Estimated monthly gap: $2,145. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Vercel AI Gateway; start route-level A/B tests there.
- Mistral Magistral Small 2509 is $6.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Provider overlap exists on Vercel AI Gateway; start route-level A/B tests there.
- Kimi K2 Thinking Turbo is $6.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-11-06 | 2025-09-01 |
| Context window | 262k | — |
| Parameters | 1T (32B active) | 24B |
| Architecture | - | - |
| License | MITOSI-approved | Apache 2.0OSI-approved |
| Openness | Open source | Open source |
| Weights | Unknown | Unknown |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: permitted | Commercial use: permitted |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Kimi K2 Thinking Turbo | Mistral Magistral Small 2509 |
|---|---|---|
| Input price | $1.15/1M tokens | $0.50/1M tokens |
| Output price | $8/1M tokens | $1.50/1M tokens |
| Providers |
Capabilities
| Capability | Kimi K2 Thinking Turbo | Mistral Magistral Small 2509 |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | No | No |
| JSON / Tool use | No | No |
| Structured outputs | No | 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.
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.