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This page includes release notes for the Weave Python SDK (weave package). For the W&B Models Python SDK (wandb package), see W&B SDK releases. Release packages and per-commit history are on GitHub Releases for wandb/weave.
These entries summarize user-facing SDK and trace server changes, and omit details about Internal-only test, CI, and refactor work. For every merged change, see the GitHub release entry for that tag.
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0.52.37
April 17, 2026

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Added

  • OpenTelemetry integrations follow the latest semantic conventions.
  • Cost calculations and provider integrations include cache token usage.

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Changed

  • Improved performance for some call queries by optionally skipping a nested subquery.
  • ClassifierMonitor is exported from the top-level weave package.
  • The calls API accepts an optional query parameter for richer filtering.

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Fixed

  • Fixed the evaluation results API SQL for some filter combinations.
  • Fixed a bug where the TypeScript SDK could drop the URL scheme from WANDB_BASE_URL.
  • Fixed a bug where calls with multiple feedback rows could appear multiple times in list results.
  • Fixed ISO-8601 timestamp handling for ClickHouse-backed queries.
  • Fixed distributed ClickHouse mutations that incorrectly appended a _local suffix to table names.
  • Fixed missing spans when tracing OpenAI Agents SDK flows.
  • Fixed Google GenAI tracing when responses include non-text parts.
  • Fixed path sanitization for in-memory trace file artifacts and provider hostname handling in HTTP clients.
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0.52.36
April 1, 2026

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Added

  • Call queries can resolve human-readable usernames.
  • ref.get() works without explicitly initializing the client in some flows.
  • APIs and storage paths for text-based evaluation results, including improved handling of large evaluation sets.

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Changed

  • LiteLLM is pinned for compatibility with bundled integrations.
  • Moonshot is available as a model provider.
  • Underlying write-ahead logging infrastructure improves durability of trace writes.

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Fixed

  • Fixed a bug where abandoning a streaming generator could surface GeneratorExit incorrectly.
  • Fixed deserialization when stored objects include extra metadata fields.
  • Fixed feedback filters when a call has multiple feedback rows.
  • Fixed SQLite-backed call cost tracking and invalid trace_id handling in batch upserts.
  • Improved ClickHouse migration behavior, including retries on transient errors and clearer migrator exit status.
  • Fixed a bug where evaluation runs with more than 1000 calls could fail to load for prediction and scoring.
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0.52.35
March 19, 2026

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Added

  • Write-ahead log support for trace ingestion.
  • Feedback statistics queries for analytics over feedback data.

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Changed

  • Ref.uri can be read as a property (ref.uri) without calling ref.uri().
  • You can configure the maximum size of debounced scoring history via environment variables.

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Fixed

  • Fixed ClickHouse casting for negative numeric filter values.
  • Fixed replicated database engine errors during on-cluster migrations.
  • Fixed DelegatingTraceServerMixin not forwarding some ServiceInterface methods.
  • Fixed retries when calling the W&B API during weave.init().
  • Fixed a bug where EvaluationLogger could crash when WEAVE_DISABLED is set.
  • Fixed RefJSONEncoder edge cases and classmethod instantiation for subclasses.
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0.52.33
March 12, 2026

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Added

  • Python SDK methods and HTTP models for object tags and aliases.
  • Instrumentation for the OpenAI Realtime API, including tool calls plus optional audio, text, and voice capture (see the TypeScript examples in the upstream release notes).

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Fixed

  • Fixed accumulation of Anthropic streaming completions in traces.
  • Fixed authenticated PUT requests in RemoteHTTPTraceServer.
  • Fixed cost query handling for calls_complete projections.
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0.52.31
March 10, 2026

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Added

  • Trace server support for tags and aliases on stored objects.
  • Claude Agents tracing integration.
  • Timestamps and time-to-first-token metrics for Realtime sessions.
  • Monitors can use merged scorers.

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Changed

  • Improved OpenTelemetry performance with a cross-request operation reference cache.

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Fixed

  • Fixed multiple issues in cost query construction, including escaping of internal fields and distributed ClickHouse setups.
  • Fixed LangChain integration handling for Pydantic v2 Run objects.
  • Fixed edge cases in prediction and scorer resolvers when inputs or metadata are missing.
  • Fixed Vertex AI text accumulation and thread visibility in calls_complete queries.
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0.52.30
March 10, 2026

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Added

  • Score backfill API for recomputing stored scores.
  • Gemini request tracking in the TypeScript SDK.

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Changed

  • Sharded distributed calls tables by trace_id or project_id for better query performance.
  • Simplified calls_complete query plans for lower latency.

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Fixed

  • Fixed a bug where Gemini media could fail to render in the Weave UI.
  • OpenTelemetry batch inserts now use async ClickHouse inserts.
  • Fixed NO_PROXY handling in HTTP clients.
  • Fixed entity versus team naming in some error messages.
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0.52.29
February 27, 2026

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Added

  • Usage APIs expose metadata for unfinished calls.
  • Optional python-magic integration for richer MIME detection.
  • Realtime threads participate in usage summaries.
  • Schema support for tags and aliases on Weave objects.
  • Structured eval_results query API for evaluation tables.

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Changed

  • Improved indexing by storing timestamps as strings in ClickHouse.
  • Reduced duplicate work during batched file creation on call upsert.

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Fixed

  • Fixed a bug where generators did not respect configured sampling rates.
  • Fixed buffering so streams flush immediately when a call ends.
  • Fixed sort-query index errors and deterministic JSON serialization for digest computation.
  • Fixed OpenTelemetry display names, make_safe_name handling, and LangChain serialization for Pydantic models.
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0.52.28
February 14, 2026

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Added

  • OpenTelemetry resource attributes can carry W&B run and project variables.
  • The ORM supports $lt and $lte comparisons.
  • OpenTelemetry projects can write directly into the calls_complete table.
  • General availability improvements for OpenAI Realtime tracing.

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Changed

  • Improved performance for table scans and call statistics queries.

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Fixed

  • Fixed filtering calls by thread ID, including cases where filters were incorrectly optimized away.
  • Fixed idempotent annotation queue state updates.
  • Fixed a bug where weave.finish() did not always flush pending client data.
  • Fixed iterator typing for PaginatedIterator, Dataset.select metadata preservation, and large trace size queries that could run out of memory.
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0.52.26
February 3, 2026

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Added

  • Usage statistics APIs plus /trace/usage and /calls/usage endpoints for aggregated usage.
  • Optional performance mode flag for high-throughput deployments.
  • Anthropic structured-parse patching.
  • Saved views support a column_order field.

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Changed

  • Improved PREWHERE optimization for distributed cluster queries.

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Fixed

  • Fixed a bug where failed ClickHouse inserts could leak buffered rows.
  • Fixed a bug where importing IPython at import time could slow cold starts.
  • Fixed synchronous mutation migrations, summary filtering on calls_complete, and Google GenAI token overcounting.
  • Fixed OpenTelemetry spans with monitors and duplicate upload handling for Google Cloud Storage.
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0.52.25
January 20, 2026

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Fixed

  • Removed redundant HTTP response capture in some integrations.
  • Google GenAI tracing now records system instructions.
  • Google GenAI tracing now records thinking tokens separately from completion tokens.
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0.52.24
January 15, 2026

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Added

  • TypeScript helper APIs for working with prompts in the Node SDK.
  • Trace server safely autoconverts Base64 payloads where appropriate.
  • Leaderboard schema updates for upcoming comparison features.
  • redact_pii_exclude_fields setting to fine-tune PII redaction.
  • Audio inputs in LLMAsAJudgeScorer and richer op metadata (kinds and colors) for integrations.

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Fixed

  • Fixed invalid characters blocking op creation in edge cases.
  • Fixed HTTP and HTTPS proxy handling for the HTTPX client.
  • Fixed nested tracing when wrapping generators.
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0.52.23
January 8, 2026

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Added

  • Parsing helpers for Logfire Pydantic AI instrumentation inputs and outputs.

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Fixed

  • Fixed non-deterministic ordering for large-table evaluations.
  • Fixed cost queries that omitted input and output tokens.
  • Fixed distributed replicated ClickHouse tables and guarded Kafka flush behavior behind configuration.
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0.52.22
January 8, 2026

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Added

  • Prompts and template variables on LLMStructuredCompletionModels persist through completion calls.

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Fixed

  • Fixed ClickHouse import compatibility issues in some environments.
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0.52.20
November 26, 2025

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Added

  • Completions streaming APIs accept prompts and template variables.
  • ObjectRef.from_uri reconstructs objects from Weave URIs.
  • OpenAI Responses API tracing records x-request-id headers.
  • Bedrock Agents integration coverage.
  • TypeScript SDK withAttributes helper for span metadata.

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Fixed

  • Fixed a memory leak in the OpenAI Agents tracing processor.
  • Fixed a bug where refs could still publish when Weave was disabled.
  • Fixed iterator behavior when migrating HTTP client code from requests to httpx.
For releases older than 0.52.20, see GitHub Releases for wandb/weave. Those entries use the default GitHub compare format (pull request links and commit prefixes). This docs page is updated for newer versions with customer-facing wording.