AI Anthropic To Bedrock

Loaded by design-ai.md when ai_source == "anthropic". The user is already on Claude via the Anthropic SDK. Migration is a client swap only. No model change, no prompt rewriting, no retraining required.

Step 1: Map model IDs to Bedrock

† Claude Sonnet 5 intro pricing through Aug 31, 2026; then $3 / $15 (same as Sonnet 4.6). Prefer the us. inference-profile prefix for on-demand invoke. Sonnet 4.6 (anthropic.claude-sonnet-4-6) remains Active if the customer must stay on the 4.6 SKU.

Older Claude models — Claude 3.5 Haiku, Claude 3 Sonnet, Claude 3.5 Sonnet (v1/v2), Claude 3 Haiku, and Claude 3.7 Sonnet — are past EOL or within the 90-day exclusion window. Do not recommend them as migration targets. See references/vendored/ai/ai-model-lifecycle.md for authoritative status (recomputed each run).

Recommendation: Default new Bedrock targets to Claude Sonnet 5 (flagship) / Claude Opus 4.8 (hardest reasoning) / Claude Haiku 4.5 (cost/speed). Converse API call shape is identical across generations. Do not default to Claude Fable 5 (frontier / Mythos-class pricing — opt-in only).

Step 2: Rewrite client

Before: anthropic.Anthropic(api_key=...) After: boto3.client("bedrock-runtime", region_name="us-east-1")

Remove ANTHROPIC_API_KEY. Use IAM role with bedrock:InvokeModel.

Step 3: Rewrite API calls

Before: client.messages.create(model=..., max_tokens=1024, messages=[{"role": "user", "content": "Hello"}])

After: client.converse(modelId="anthropic.claude-sonnet-5", messages=[{"role": "user", "content": [{"text": "Hello"}]}], inferenceConfig={"maxTokens": 1024})

Key differences:

• content is typed blocks [{“text”: “…”}] not a plain string
• max_tokens moves to inferenceConfig.maxTokens
• response text at response["output"]["message"]["content"][0]["text"]

Step 4: System prompts

Before: system="You are helpful" as a string param After: system=[{"text": "You are helpful"}] as a list of blocks

Step 5: Streaming

Before: client.messages.stream() context manager After: client.converse_stream() — iterate response["stream"] for contentBlockDelta events

Step 6: IAM permissions

Add bedrock:InvokeModel and bedrock:InvokeModelWithResponseStream on arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-*

Step 7: Request Bedrock quota

Request TPM increases via Service Quotas. Cross-region inference profiles (us.* prefix) have higher shared limits.

Validation checklist

• Not done: anthropic.Anthropic() replaced with boto3.client(“bedrock-runtime”)
• Not done: client.messages.create() replaced with client.converse()
• Not done: content blocks use typed format [{“text”: “…”}]
• Not done: max_tokens moved to inferenceConfig.maxTokens
• Not done: Streaming uses converse_stream with contentBlockDelta events
• Not done: ANTHROPIC_API_KEY removed from environment/secrets
• Not done: IAM role has bedrock:InvokeModel permission
• Not done: Model IDs updated to Bedrock format (Claude 4.x recommended)