Kimi K2.5 (OpenRouter) vs Mistral: Mistral Medium 3.5: API Cost Comparison
Compare the API pricing, context windows, features, and real-world cost projections for Kimi K2.5 (OpenRouter) (OpenRouter) and Mistral: Mistral Medium 3.5 (Mistral AI). Use the interactive calculator below to compute your exact monthly cost based on your token usage and request volume.
Prices verified May 6, 2026
Interactive Cost Calculator
Fills in typical token counts for a workload type
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Showing costs for 2 models. Cheapest: Kimi K2.5 (OpenRouter) at $15.50/month.
| Alert | |||||||
|---|---|---|---|---|---|---|---|
BestKimi K2.5 (OpenRouter) | OpenRouter | $15.50 | $0.001550 | $4.50 | $11.00 | 70.5% | Alerts coming soon |
Mistral: Mistral Medium 3.5 | Mistral AI | $52.50 | $0.005250 | $15.00 | $37.50 | — | Alerts coming soon |
Monthly Cost Comparison
Price Comparison at a Glance
All prices are in USD per 1 million tokens ($/M tokens). Lower is cheaper.
| Pricing Type | Kimi K2.5 (OpenRouter) | Mistral: Mistral Medium 3.5 | Cheaper |
|---|---|---|---|
| Input (standard) | $0.45/M | $1.50/M | Kimi K2.5 (OpenRouter) |
| Output | $2.20/M | $7.50/M | Kimi K2.5 (OpenRouter) |
Prices last verified: 2026-03-10 – 2026-05-06
Cost Breakdown by Usage Volume
Estimated monthly costs at different request volumes, assuming 1,000 input tokens and 500 output tokens per request. Adjust in the calculator above for your specific use case.
| Volume | Kimi K2.5 (OpenRouter)Monthly | Mistral: Mistral Medium 3.5Monthly | Kimi K2.5 (OpenRouter)Per request | Mistral: Mistral Medium 3.5Per request |
|---|---|---|---|---|
| 1K requests/mo | $1.55 | $5.25 | $0.001550 | $0.005250 |
| 10K requests/mo | $15.50 | $52.50 | $0.001550 | $0.005250 |
| 100K requests/mo | $155.00 | $525.00 | $0.001550 | $0.005250 |
| 1M requests/mo | $1,550.00 | $5,250.00 | $0.001550 | $0.005250 |
Green values indicate the lower-cost option at each volume tier. Cost per request is calculated at 1,000 input + 500 output tokens using standard (non-batch, non-cached) pricing.
Price History
Input price per 1M tokensWhen to Choose Kimi K2.5 (OpenRouter)
by OpenRouter
- Document summarization
- General chatbot
- RAG / Semantic search
Input / 1M tokens
$0.45/M
Output / 1M tokens
$2.20/M
Context window
262,144
Tier
mid
When to Choose Mistral: Mistral Medium 3.5
by Mistral AI
- General chatbot
Input / 1M tokens
$1.50/M
Output / 1M tokens
$7.50/M
Context window
262,144
Tier
mid
Key Differences Beyond Price
Cost is only one factor in choosing an AI model. Context window size, rate limits, supported features, and latency all affect whether a model fits your use case.
| Capability | Kimi K2.5 (OpenRouter) | Mistral: Mistral Medium 3.5 |
|---|---|---|
| Context window | 262,144 tokens | 262,144 tokens |
| Max output tokens | 65,535 tokens | 4,096 tokens |
| Performance tier | Mid | Mid |
| Vision / image input | No | Yes |
| Function calling | Yes | Yes |
| JSON mode | Yes | Yes |
| Prompt caching | No | No |
| Batch API (50% discount) | No | No |
| Extended reasoning | No | Yes |
| Fine-tuning | No | No |
Kimi K2.5 (OpenRouter) notes
OpenRouter offers 200+ models — showing top 15 unique models not available from other listed providers. Prices include OpenRouter markup.
Frequently Asked Questions
Is Kimi K2.5 (OpenRouter) cheaper than Mistral: Mistral Medium 3.5?
At standard usage (1,000 input tokens, 500 output tokens, 100,000 requests/month), Kimi K2.5 (OpenRouter) costs $155.00/month versus $525.00/month for Mistral: Mistral Medium 3.5 — a 70% saving. Your actual savings will vary based on your token profile; output-heavy workloads amplify differences in output pricing.
Which model has a larger context window, Kimi K2.5 (OpenRouter) or Mistral: Mistral Medium 3.5?
Both Kimi K2.5 (OpenRouter) and Mistral: Mistral Medium 3.5 have the same context window: 262,144 tokens.
Do Kimi K2.5 (OpenRouter) and Mistral: Mistral Medium 3.5 support the Batch API?
Neither Kimi K2.5 (OpenRouter) nor Mistral: Mistral Medium 3.5 currently supports a batch API with discounted pricing. For batch-eligible alternatives, consider models from OpenAI, Anthropic, or Google that include batch API support.
Which model offers better prompt caching?
Neither Kimi K2.5 (OpenRouter) nor Mistral: Mistral Medium 3.5 currently supports prompt caching. For prompt-caching capable alternatives, consider Claude models from Anthropic or GPT-4o from OpenAI.
What are the best use cases for Kimi K2.5 (OpenRouter) vs Mistral: Mistral Medium 3.5?
Both models are well-suited for General chatbot. Kimi K2.5 (OpenRouter) is particularly strong for Document summarization, RAG / Semantic search. Mistral: Mistral Medium 3.5 is favored for similar workflows. At the same quality level, the lower-cost model is usually preferable; use this page's calculator to compare total monthly spend at your volume.
What is the cost per request for Kimi K2.5 (OpenRouter) vs Mistral: Mistral Medium 3.5?
At 1,000 input tokens and 500 output tokens per request — a typical conversational workload — Kimi K2.5 (OpenRouter) costs $0.001550 per request and Mistral: Mistral Medium 3.5 costs $0.005250 per request. At 100,000 requests/month, that translates to $155.00 and $525.00 respectively. Use the interactive calculator to adjust these parameters for your actual workload.
Kimi K2.5 (OpenRouter) vs Mistral: Mistral Medium 3.5: Summary
When comparing Kimi K2.5 (OpenRouter) and Mistral: Mistral Medium 3.5 for API cost, the right choice depends on your workload's token profile, required features, and tolerance for latency. Kimi K2.5 (OpenRouter) offers lower total cost at standard usage volumes (1,000 input + 500 output tokens per request at 100,000 requests/month) at $155.00/month, compared to $525.00/month for Mistral: Mistral Medium 3.5.
Both models are priced in USD per million tokens, the standard unit across all major AI API providers. Kimi K2.5 (OpenRouter) charges $0.45/M for input tokens and $2.20/M for output tokens. Mistral: Mistral Medium 3.5 charges $1.50/M input and $7.50/M output. If your workload is output-heavy (more tokens generated than consumed as input), the model with the lower output price compounds cost savings significantly at scale.
Context window capacity differs between the two: Both models support 262,144 tokens per request. A larger context window is essential for document summarization, large codebase analysis, and multi-document retrieval-augmented generation (RAG) applications.
Use the interactive calculator at the top of this page to enter your actual token usage and monthly request volume for a precise cost comparison tailored to your workload. Adjust for batch API discounts and prompt caching to find the most cost-effective option for your specific deployment.
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Relevant Use Cases
See cost recommendations for workloads where Kimi K2.5 (OpenRouter) or Mistral: Mistral Medium 3.5 is recommended.