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Published November 21, 2025 | Version 2025.11.5
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TensorZero

Authors/Creators

Description

[!CAUTION] Breaking Changes

  • Moving forward, explicit tensorzero::params will take precedence over conflicting native parameters when using the OpenAI-compatible inference endpoint.

[!WARNING] Planned Deprecations

  • Rename json_mode="implicit_tool" to json_mode="tool".
  • Set model_name and optionally provider_name instead of model_provider_name in extra_body and extra_headers objects supplied at inference time. Alternatively, don't include a scope filter at all.

New Features

  • Support Anthropic's Beta Structured Outputs feature natively (beta_structured_outputs). extra_headers is no longer necessary.
  • Support json_mode="tool" in chat inferences that don't otherwise include tools.
  • Support extra_body and extra_headers supplied at inference time without scope filters.
  • Support extra_body and extra_headers supplied at inference time with model_name and optional provider_name scope filters.
  • Support thought signatures for the GCP Vertex model providers.
  • Support custom tools for the OpenAI model provider.
  • Add description fields to evaluation and evaluator configuration.

& multiple under-the-hood and UI improvements

Notes

If you use this software, please cite it as below.

Files

tensorzero/tensorzero-2025.11.5.zip

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