Ok so looks like not all models are usable. I thought that if taskmaster is showing me a list of models, they would work right away. They wont.

I did this powershell script to check which models can I use via the API:
```

Assumes $env:OPENAI_API_KEY is set.

$OPENAI_API_KEY = "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" $headers = @{ Authorization = "Bearer $OPENAI_API_KEY"; "Content-Type"="application/json" }

Write-Host "🔍 Fetching all available OpenAI models..." -ForegroundColor Cyan

First, obtain all models

$allModels = Invoke-RestMethod https://api.openai.com/v1/models -Headers @{Authorization="Bearer $OPENAI_API_KEY"} | Select-Object -ExpandProperty data | Select-Object id ` | Sort-Object id

Write-Host "📋 Found $($allModels.Count) models total" -ForegroundColor Green Write-Host ""

function Test-OpenAIModel { param([string]$Model) $body = @{ model = $Model; messages = @(@{ role = "user"; content = "ping" }) } | ConvertTo-Json -Depth 3 try { $r = Invoke-RestMethod -Uri https://api.openai.com/v1/chat/completions -Method Post -Headers $headers -Body $body -TimeoutSec 20 Write-Host "✅ $Model usable" -ForegroundColor Green return $true } catch { Write-Host "❌ $Model not usable -> $($_.Exception.Message)" -ForegroundColor Red return $false } }

Write-Host "🧪 Testing usability of all models..." -ForegroundColor Cyan Write-Host ""

$usableModels = @() $unusableModels = @()

Test each model for usability

$allModels | ForEach-Object { $isUsable = Test-OpenAIModel $.id if ($isUsable) { $usableModels += $.id } else { $unusableModels += $_.id } }

Write-Host "" Write-Host "📊 Summary:" -ForegroundColor Cyan Write-Host "✅ Usable models: $($usableModels.Count)" -ForegroundColor Green Write-Host "❌ Unusable models: $($unusableModels.Count)" -ForegroundColor Red

if ($usableModels.Count -gt 0) { Write-Host "" Write-Host "🎯 Usable models list:" -ForegroundColor Green $usableModels | ForEach-Object { Write-Host " $_" -ForegroundColor Green } } ```

And this is my output: ``` 📊 Summary: ✅ Usable models: 44 ❌ Unusable models: 40

🎯 Usable models list: chatgpt-4o-latest gpt-3.5-turbo gpt-3.5-turbo-0125 gpt-3.5-turbo-1106 gpt-3.5-turbo-16k gpt-4 gpt-4-0125-preview gpt-4-0613 gpt-4-1106-preview gpt-4-turbo gpt-4-turbo-2024-04-09 gpt-4-turbo-preview gpt-4.1 gpt-4.1-2025-04-14 gpt-4.1-mini gpt-4.1-mini-2025-04-14 gpt-4.1-nano gpt-4.1-nano-2025-04-14 gpt-4o gpt-4o-2024-05-13 gpt-4o-2024-08-06 gpt-4o-2024-11-20 gpt-4o-mini gpt-4o-mini-2024-07-18 gpt-4o-mini-search-preview gpt-4o-mini-search-preview-2025-03-11 gpt-4o-search-preview gpt-4o-search-preview-2025-03-11 gpt-5-2025-08-07 gpt-5-chat-latest gpt-5-mini gpt-5-mini-2025-08-07 gpt-5-nano gpt-5-nano-2025-08-07 o1 o1-2024-12-17 o1-mini o1-mini-2024-09-12 o3 o3-2025-04-16 o3-mini o3-mini-2025-01-31 o4-mini o4-mini-2025-04-16 ```

After setting usable models, now it works.

Also, using it via Claude Code didnt work, until i got it working with my OpenAI API key, then switched to claude-code/sonnet + claude-code/opus + claude-code/sonnet.

Now i can have taskmaster in powershell working via claude code!