psllm.ps1

<#
    .EXAMPLE
    llm "what is the capital of spain" -provider openai

    .EXAMPLE
    llm "what is the capital of spain" -provider anthropic

    .EXAMPLE
    llm "what is the capital of spain" -provider gemini
#>
param(
    [Parameter(Mandatory)]
    $prompt,
    [ValidateSet('openai', 'anthropic', 'gemini')]
    $provider = 'openai'
)

if ($null -eq $model) {
    switch ($provider) {
        'openai' {
            if ($null -eq $env:OpenAIKey) {
                throw "OpenAIKey environment variable not set"
            }
            $params = @{
                Headers     = @{Authorization = "Bearer $($env:OpenAIKey)" }
                Uri         = 'https://api.openai.com/v1/chat/completions'
                Method      = 'POST'
                ContentType = 'application/json'
                body        = [ordered]@{
                    model      = 'gpt-3.5-turbo'                    
                    max_tokens = 1024
                    messages   = @(
                        @{
                            role    = 'user'
                            content = $prompt
                        }
                    )
                } | ConvertTo-Json -Depth 10
            }

            $r = Invoke-RestMethod @params
            [pscustomobject][ordered]@{
                provider = $provider
                Response = $r.choices[0].message.content
            }
                
        }
        'anthropic' {
            if ($null -eq $env:AnthropicAPIKey) {
                throw "AnthropicKey environment variable not set"
            }

            $headers = @{
                'x-api-key'         = $env:AnthropicAPIKey
                'anthropic-version' = '2023-06-01'
                'Content-Type'      = 'application/json'
            }

            $body = @{
                model      = "claude-3-opus-20240229"
                max_tokens = 1024
                messages   = @(
                    @{
                        role    = "user"
                        content = $prompt
                    }
                )
            }

            $r = Invoke-RestMethod -Uri 'https://api.anthropic.com/v1/messages' -Method Post -Headers $headers -Body ($body | ConvertTo-Json -Depth 10)

            [pscustomobject][ordered]@{
                provider = $provider
                Response = $r.content.text
            }
        }
        'gemini' {
            if ($null -eq $env:GeminiKey) {
                throw "GeminiKey environment variable not set"
            }

            $params = @{
                Uri         =	"https://generativelanguage.googleapis.com/v1beta/models/gemini-pro:generateContent?key=$($env:GeminiKey)"
                Method      =	"Post"
                ContentType =	'application/json'
                body        = @{
                    contents = @(
                        @{
                            "parts" = @(
                                @{
                                    "text" = $prompt
                                }
                            )
                        }
                    )
                } | ConvertTo-Json -Depth 10
            }

            $r = Invoke-RestMethod @params
            [pscustomobject][ordered]@{
                provider = $provider
                Response = $r.candidates[0].content.parts[0].text
            }
        }
    }
}

'openai', 'anthropic', 'gemini' | % { psllm.ps1 'capital of spain' -provider $_  }

provider  Response
--------  --------
openai    Madrid
anthropic The capital of Spain is Madrid.
gemini    Madrid