## Support semantics
This is a **candidate / unverified** Solution from the KFA Solution Factory Tier-2 gate. It is source-grounded research material, not an Outcome, and does **not** claim independent reproduction or confirmed field success.
## Cause
_calculate_nonstreaming_timeout estimates expected duration from max_tokens and raises ValueError when it exceeds 600s or max_tokens exceeds model-specific non-streaming caps; messages.create invokes this when not streaming and no custom timeout is provided.
## Steps
1. Prefer client.messages.stream(...) and consume get_final_message() for long generations.
2. Alternatively pass stream=True on create or set timeout explicitly on the request or Anthropic client.
3. If staying non-streaming, lower max_tokens below the SDK threshold for the model.
## Expected result
SDK proceeds to send the HTTP request instead of raising the streaming-required ValueError locally.
## Misleading approaches
- Retrying the same non-streaming call expecting transient failure.
- Increasing max_tokens without enabling streaming while keeping default timeout.
## Limitations
- Explicit timeout override disables the guard but does not remove server/network long-request risks documented by Anthropic.
- Error may be misreported upstream as API 400 though no HTTP request is sent.
## Unknowns
- Exact MODEL_NONSTREAMING_TOKENS map per model id in the installed SDK version (read from source at deploy time).
## Evidence claims
- (documented_platform_behavior) The Python SDK raises ValueError with the streaming-required message when estimated non-streaming duration exceeds ten minutes based on max_tokens. — https://raw.githubusercontent.com/anthropics/anthropic-sdk-python/main/src/anthropic/_base_client.py
- (documented_platform_behavior) messages.create calls _calculate_nonstreaming_timeout for non-streaming requests when no explicit timeout is set and the client uses DEFAULT_TIMEOUT. — https://raw.githubusercontent.com/anthropics/anthropic-sdk-python/main/src/anthropic/resources/messages/messages.py
- (documented_workaround) Official Python SDK documentation states stream=True or timeout override disables the ValueError guard. — https://platform.claude.com/docs/en/cli-sdks-libraries/sdks/python
Proposed approach
- Problem id
- 52a27814-e135-4237-b9ca-b0ded593d3e9
- Proposed action
- Use messages.stream() / stream=True for large outputs; or set an explicit per-request or client timeout to bypass the guard; or reduce max_tokens to stay within non-streaming limits.
- Applicability
- State
- partial
- Text
- support: candidate_unverified (not an Outcome; no reproduction claim); Python SDK messages.create with stream=False, client timeout left at default (10 minutes), and max_tokens large enough that 3600*max_tokens/128000 > 600 seconds (~21333 tokens) or above MODEL_NONSTREAMING_TOKENS for the model.; fix_status: PARTIAL
- Limitations
- State
- partial
- Text
- Explicit timeout override disables the guard but does not remove server/network long-request risks documented by Anthropic. Error may be misreported upstream as API 400 though no HTTP request is sent.
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
Needs revalidation
LOW EVIDENCE
This exact knowledge revision needs ordinary execution evidence.
Useful environment or version
- State
- partial
- Text
- support: candidate_unverified (not an Outcome; no reproduction claim); Python SDK messages.creat
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