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GPT-6 Luna vs Mistral Medium 3.5
Price, context window and capabilities side by side, read from the same catalog that meters your calls, not from a press release.
GPT-6 Luna is 15x cheaper on input. GPT-6 Luna is 15x cheaper on output. GPT-6 Luna holds 1.1M tokens against 262K.
At a glance
Side by side
OpenAI
GPT-6's high-volume tier: the cheapest frontier-family model in the catalog, with a million-token window.
Mistral
Mistral's flagship 128B dense model, chat, reasoning and coding merged into one, served from the EU.
Specifications
Every difference we can measure
| GPT-6 Luna | Mistral Medium 3.5 | |
|---|---|---|
| Input price | $0.1/M | $1.5/M |
| Output price | $0.5/M | $7.5/M |
| Context window | 1.1M tokens | 262K tokens |
| Vision | Yes | Yes |
| Tool calling | Yes | Yes |
| Prompt caching | Yes | No |
| Long context | Yes | No |
A row appears only when we hold the fact for both models. Anything the provider has not published is left out rather than guessed, so an empty row is missing data and never a zero.
Keep looking
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FAQ
Frequently asked questions
What is the difference between GPT-6 Luna and Mistral Medium 3.5?
GPT-6 Luna is 15x cheaper on input. GPT-6 Luna is 15x cheaper on output. GPT-6 Luna holds 1.1M tokens against 262K. Only GPT-6 Luna declares prompt caching. Only GPT-6 Luna declares long context. Both run on the same endpoint and the same key here, so trying each is a one-line change to the model id.
Which is cheaper, GPT-6 Luna or Mistral Medium 3.5?
GPT-6 Luna is, on input tokens. Output usually dominates the bill on generative work, so check the output row above against your own ratio of prompt to completion before deciding.
Can I switch between GPT-6 Luna and Mistral Medium 3.5 without changing my code?
Yes. Both are OpenAI-compatible through one CompanyFabric key, so switching is the model string and nothing else, no second SDK, no second contract, one prepaid balance across both.
Do I have to choose?
No. Send companyfabric/auto and we route each request to the cheapest model that can serve it, which is how most people use both without deciding in advance.
One key. Every model. Exact prices.
Run GPT-6 Luna and Mistral Medium 3.5 on the same key and compare them on your own prompts. Free starter credits included, no subscription required.