We've added support for @MistralAI chat completions and streaming chat completions in AIProxySwift release 0.43.0.

Chat completions:

import AIProxy

let mistralService = AIProxy.mistralService(
    partialKey: "partial-key-from-your-developer-dashboard",
    serviceURL: "service-url-from-your-developer-dashboard"
)

do {
    let response = try await mistralService.chatCompletionRequest(body: .init(
        messages: [.user(content: "Hello world")],
        model: "mistral-small-latest"
    ))
    print(response.choices.first?.message.content ?? "")
    if let usage = response.usage {
        print(
            """
            Used:
                \(usage.promptTokens ?? 0) prompt tokens
                \(usage.completionTokens ?? 0) completion tokens
                \(usage.totalTokens ?? 0) total tokens
            """
        )
    }
}  catch AIProxyError.unsuccessfulRequest(let statusCode, let responseBody) {
    print("Received non-200 status code: \(statusCode) with response body: \(responseBody)")
} catch {
    print("Could not create mistral chat completion: \(error.localizedDescription)")
}

Streaming chat completion:

import AIProxy

let mistralService = AIProxy.mistralService(
    partialKey: "partial-key-from-your-developer-dashboard",
    serviceURL: "service-url-from-your-developer-dashboard"
)

do {
    let stream = try await mistralService.streamingChatCompletionRequest(body: .init(
        messages: [.user(content: "Hello world")],
        model: "mistral-small-latest"
    ))
    for try await chunk in stream {
        print(chunk.choices.first?.delta.content ?? "")
        if let usage = chunk.usage {
            print(
                """
                Used:
                    \(usage.promptTokens ?? 0) prompt tokens
                    \(usage.completionTokens ?? 0) completion tokens
                    \(usage.totalTokens ?? 0) total tokens
                """
            )
        }
    }
} catch AIProxyError.unsuccessfulRequest(let statusCode, let responseBody) {
    print("Received non-200 status code: \(statusCode) with response body: \(responseBody)")
} catch {
    print("Could not create mistral streaming chat completion: \(error.localizedDescription)")
}