Skip to main content
Watch: I Built an AI App Without Leaving Databricks

Amazon Bedrock (Runtime API) error

Amazon Bedrock 429 ThrottlingException: what it means and how to fix it

Error message
429 ThrottlingException

Retry? YesLast verified 4 documented fixes3 sources

What it means

Your request was denied due to exceeding the account quotas for Amazon Bedrock.

Causes

  • Exceeding Amazon Bedrock account quotas

How to fix it

  1. Fix 1.

    Check the Amazon Bedrock service quotas to learn the limits allotted to your account.

  2. Fix 2.

    Use retries with exponential backoff and random jitter. AWS SDKs classify ThrottlingException as a throttling error and retry it in standard mode (default max_attempts 3).

  3. Fix 3.

    For predictable, sustained throughput, consider Reserved Tier or Provisioned Throughput where the model supports it.

  4. Fix 4.

    Request a quota increase through your account manager or AWS Support if your workload exceeds your account quotas.

More Amazon Bedrock errors

All 22 Amazon Bedrock errors

HTTP 429 at other providers

Compare 429 across providers

FAQ

What does the Amazon Bedrock error "429 ThrottlingException" mean?

Your request was denied due to exceeding the account quotas for Amazon Bedrock.

How do I fix Amazon Bedrock "429 ThrottlingException"?

There are 4 documented fixes. Start with the first: Check the Amazon Bedrock service quotas to learn the limits allotted to your account.

Should I retry Amazon Bedrock "429 ThrottlingException"?

Yes. The official docs treat this error as retryable.

Which other AI APIs return HTTP 429?

Per their official error docs: Anthropic API (429 rate_limit_error; 429 rate_limit_error (enforced_spend_limit_reached)), Azure OpenAI (429 Too Many Requests (Rate limit is exceeded); 429 Too Many Requests (System is experiencing high demand); 429 Too Many Requests (temporary rate limit adjustment); 429 Too Many Requests (token budget exceeded by request parameters)), Cohere API (429 Too Many Requests), DeepSeek API (429 - Rate Limit Reached), Gemini API (429 rate_limit_exceeded; 429 quota_exceeded; 429 too_many_requests; 429 RESOURCE_EXHAUSTED), Groq API (429 Too Many Requests), Mistral API (429 Too many requests), OpenAI API (429 credit_balance_exhausted; 429 Rate limit reached for requests; 429 rate_limit_error slow_down; 429 organization_spend_limit_exceeded; 429 project_spend_limit_exceeded; 429 organization_usage_limit_exceeded), OpenRouter (429 rate_limit_exceeded), Vertex AI (429 RESOURCE_EXHAUSTED; 429 Resource exhausted, please try again later; 429 Too many requests. Exceeded the Provisioned Throughput), xAI API (429 Too Many Requests).

Sources

Last verified against 3 sources: Amazon Bedrock's official docs and official SDK repositories.

Newsletter

Know when the APIs change

One email per week. New model releases, API changes, what broke, and how developers are working around it.