How to Start: Recommended Order

1. Start with Claude Platform if you want the fastest direct access to Fable 5. The credit is small but immediate and simple to use.

2. If you want more free compute, open a Google Cloud Free Trial and enable Vertex AI with Claude models. The $300 credit over 90 days gives you the longest and most generous testing window.

3. If you have an existing AWS account or can join AWS Activate, try Amazon Bedrock after confirming your specific credit (new account, Activate, etc.) covers Bedrock and third-party model usage.

4. Use Microsoft Foundry only if you have an enterprise Azure subscription (e.g., EA or MCA-E) where Marketplace billing is managed and you are not relying on startup or free-trial credits.

Critical Warnings & What to Double-Check

• Microsoft Foundry billing trap: Multiple independent sources and user reports confirm that Microsoft for Startups and Azure sponsorship credits do not apply to Claude Marketplace charges. You risk being billed directly to your credit card without realizing it.
• AWS credit coverage: While AWS Activate credits can be used for third-party Bedrock models, not all AWS credit programs include this. Always check your AWS Billing & Cost Management dashboard before heavy usage.
• Anthropic new-user credit: The amount is typically around $5 (reported consistently by multiple third-party sources), but it is a one-time trial credit, not a recurring free tier. It works on all Claude models including Fable 5.
• Google Cloud credit confirmation: The $300 credit is explicitly documented for new Google Cloud accounts and works with Vertex AI, which includes Claude models.

What's Still Uncertain

• Whether AWS Free Tier credits ($100–$200) cover Bedrock specifically depends on your account creation date and region. Some new accounts after July 2025 get Bedrock-specific onboarding incentives.
• Google Cloud's $300 credit covering all Vertex AI usage is well-documented, but if you use other GCP services (Compute Engine, Cloud Storage), those will also draw from the same $300 pool.

Trusted Sources

• Anthropic official docs for Claude Fable 5 availability and platform access.
• Google Cloud Free Program / Vertex AI docs for the $300 credit and Claude pathway.
• AWS Activate and Bedrock pricing docs for credit applicability to third-party models.
• Microsoft documentation and community Q&A for the critical warning about Foundry Marketplace billing.

Bottom line: Google Cloud Vertex AI is your best bet for a large, reliable free credit ($300 for 90 days). Claude Platform is your fastest option (small instant credit). Do not enter API keys or personal information into unknown 'free Claude' websites — only use official platforms with transparent pricing.

How to Start: Recommended Order

1. Start with Claude Platform if you want the fastest direct access to Fable 5. The credit is small but immediate and simple to use.

2. If you want more free compute, open a Google Cloud Free Trial and enable Vertex AI with Claude models. The $300 credit over 90 days gives you the longest and most generous testing window.

3. If you have an existing AWS account or can join AWS Activate, try Amazon Bedrock after confirming your specific credit (new account, Activate, etc.) covers Bedrock and third-party model usage.

4. Use Microsoft Foundry only if you have an enterprise Azure subscription (e.g., EA or MCA-E) where Marketplace billing is managed and you are not relying on startup or free-trial credits.

Critical Warnings & What to Double-Check

• Microsoft Foundry billing trap: Multiple independent sources and user reports confirm that Microsoft for Startups and Azure sponsorship credits do not apply to Claude Marketplace charges. You risk being billed directly to your credit card without realizing it.
• AWS credit coverage: While AWS Activate credits can be used for third-party Bedrock models, not all AWS credit programs include this. Always check your AWS Billing & Cost Management dashboard before heavy usage.
• Anthropic new-user credit: The amount is typically around $5 (reported consistently by multiple third-party sources), but it is a one-time trial credit, not a recurring free tier. It works on all Claude models including Fable 5.
• Google Cloud credit confirmation: The $300 credit is explicitly documented for new Google Cloud accounts and works with Vertex AI, which includes Claude models.

What's Still Uncertain

• Whether AWS Free Tier credits ($100–$200) cover Bedrock specifically depends on your account creation date and region. Some new accounts after July 2025 get Bedrock-specific onboarding incentives.
• Google Cloud's $300 credit covering all Vertex AI usage is well-documented, but if you use other GCP services (Compute Engine, Cloud Storage), those will also draw from the same $300 pool.

Trusted Sources

• Anthropic official docs for Claude Fable 5 availability and platform access.
• Google Cloud Free Program / Vertex AI docs for the $300 credit and Claude pathway.
• AWS Activate and Bedrock pricing docs for credit applicability to third-party models.
• Microsoft documentation and community Q&A for the critical warning about Foundry Marketplace billing.

Bottom line: Google Cloud Vertex AI is your best bet for a large, reliable free credit ($300 for 90 days). Claude Platform is your fastest option (small instant credit). Do not enter API keys or personal information into unknown 'free Claude' websites — only use official platforms with transparent pricing.