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Langfuse/Python SDK

Python SDK

$npx -y @buildinternet/releases show langfuse-python-sdk

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Releases23Avg7/moVersionsv3.12.0 → v4.4.0b1

Oct 20, 2025

What's Changed

chore: drops support for Python 3.9 (end of life)
fix(client): HTTP headers concatenated by dashes instead of snakecase by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1404
feat(langchain): add v1 support by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1411

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.7.0...v3.8.0

Oct 16, 2025

What's Changed

feat(api): update API spec from langfuse/langfuse fa2979b by @langfuse-bot in https://github.com/langfuse/langfuse-python/pull/1403
feat(observe): handle starlette.StreamingResponse by @yorickvP in https://github.com/langfuse/langfuse-python/pull/1394

New Contributors

@yorickvP made their first contribution in https://github.com/langfuse/langfuse-python/pull/1394

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.6.2...v3.7.0

Oct 10, 2025

What's Changed

feat(api): update API spec from langfuse/langfuse dee644d by @langfuse-bot in https://github.com/langfuse/langfuse-python/pull/1398
fix: ensure ingestion and media queues are always flushed by @abhishar432 in https://github.com/langfuse/langfuse-python/pull/1401

New Contributors

@abhishar432 made their first contribution in https://github.com/langfuse/langfuse-python/pull/1401

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.6.1...v3.6.2

Oct 2, 2025

What's Changed

fix(experiments): pass full evaluation to score creation by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1391

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.6.0...v3.6.1

Oct 1, 2025

What's Changed

feat(api): update API spec from langfuse/langfuse 9b8868a by @langfuse-bot in https://github.com/langfuse/langfuse-python/pull/1384
fix(client): setting OTEL span status as error on Langfuse error (#1387) by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1388

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.5.2...v3.6.0

Sep 28, 2025

What's Changed

fix(observe): handle generator context propagation by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1383

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.5.1...v3.5.2

Sep 25, 2025

What's Changed

fix(langchain): maintain async context in tool executions by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1380

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.5.0...v3.5.1

Sep 18, 2025

What's Changed

chore(deps): bump pydantic from 2.11.7 to 2.11.9 by @dependabot[bot] in https://github.com/langfuse/langfuse-python/pull/1343
fix(prompt-placeholders): don't strip tool calls from placeholder messages by @nimarb in https://github.com/langfuse/langfuse-python/pull/1346
chore(deps-dev): bump pytest from 8.4.1 to 8.4.2 by @dependabot[bot] in https://github.com/langfuse/langfuse-python/pull/1322
chore(typo): fix minor typos in langfuse client comments by @jitokim in https://github.com/langfuse/langfuse-python/pull/1350
feat: support custom export path to export spans by @yash025 in https://github.com/langfuse/langfuse-python/pull/1342
chore: test to validate multiple calls to update_trace don't drop att… by @nimarb in https://github.com/langfuse/langfuse-python/pull/1369
feat(api): update API spec from langfuse/langfuse a7d59d7b by @langfuse-bot in https://github.com/langfuse/langfuse-python/pull/1371
feat(openai): add openai embeddings api support (#1345) by @minimAluminiumalism in https://github.com/langfuse/langfuse-python/pull/1372

New Contributors

@jitokim made their first contribution in https://github.com/langfuse/langfuse-python/pull/1350
@yash025 made their first contribution in https://github.com/langfuse/langfuse-python/pull/1342
@minimAluminiumalism made their first contribution in https://github.com/langfuse/langfuse-python/pull/1372
@langfuse-bot made their first contribution in https://github.com/langfuse/langfuse-python/pull/1371

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.4.0...v3.5.0

Sep 17, 2025

What's Changed

feat(experiments): add experiment runner by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1334

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.3.5...v3.4.0

Sep 16, 2025

What's Changed

fix(langchain): set cost to zero on errors by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1328
fix(client): pass env var tracing environment to resource manager by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1331
fix(openai): handle None arguments in tool calls by @Zentorno in https://github.com/langfuse/langfuse-python/pull/1339
fix(get_client): preserve properties on client such as environment by @nimarb in https://github.com/langfuse/langfuse-python/pull/1341
chore(deps-dev): bump langgraph from 0.6.6 to 0.6.7 by @dependabot[bot] in https://github.com/langfuse/langfuse-python/pull/1327
fix(prompt-folders): update prompt in folder failed with wrong encoding by @aaguirre-rdit in https://github.com/langfuse/langfuse-python/pull/1335

New Contributors

@Zentorno made their first contribution in https://github.com/langfuse/langfuse-python/pull/1339
@aaguirre-rdit made their first contribution in https://github.com/langfuse/langfuse-python/pull/1335

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.3.4...v3.3.5

Sep 2, 2025

What's Changed

add prompt cache invalidation functionality by @cemasma in https://github.com/langfuse/langfuse-python/pull/1278
feat(client): add optional override default cache ttl capability for prompt caching by @cemasma in https://github.com/langfuse/langfuse-python/pull/1249
fix(langchain): parse tool_calls from AIMessage by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1316
fix(openai): openrouter non-streamed cost tracking by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1319

New Contributors

@cemasma made their first contribution in https://github.com/langfuse/langfuse-python/pull/1278

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.3.3...v3.3.4

Sep 1, 2025

What's Changed

chore(deps-dev): bump ruff from 0.12.10 to 0.12.11 by @dependabot[bot] in https://github.com/langfuse/langfuse-python/pull/1315
fix(langchain): token detach exceptions in async contexts by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1317

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.3.2...v3.3.3

Aug 27, 2025

What's Changed

feat(langchain): set callback spans to active in OTEL context by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1310
fix: add support for capturing usage details with ChatBedRock by @pbvignesh in https://github.com/langfuse/langfuse-python/pull/1267
feat(openai): add openrouter cost tracking by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1311
fix(langchain): do not end span on agent callbacks by @qnnn and @hassiebp in https://github.com/langfuse/langfuse-python/pull/1312
fix: resolve GCS bad request error in media uploads. by @Jay-flow in https://github.com/langfuse/langfuse-python/pull/1265
fix(span): fallback to client environment if not provided by @Digma in https://github.com/langfuse/langfuse-python/pull/1304

New Contributors

@pbvignesh made their first contribution in https://github.com/langfuse/langfuse-python/pull/1267
@Jay-flow made their first contribution in https://github.com/langfuse/langfuse-python/pull/1265
@Digma made their first contribution in https://github.com/langfuse/langfuse-python/pull/1304
@qnnn made their first contribution in https://github.com/langfuse/langfuse-python/pull/1312

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.3.1...v3.3.2

Aug 26, 2025

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.3.1...v3.3.1

What's Changed

feat(traces): add more observation types by @nimarb in https://github.com/langfuse/langfuse-python/pull/1290
chore: update default value docs for FLUSH_AT and FLUSH_INTERVAL by @qnnn in https://github.com/langfuse/langfuse-python/pull/1306
fix(langchain): capture usage on streamed gemini responses by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1309

New Contributors

@qnnn made their first contribution in https://github.com/langfuse/langfuse-python/pull/1306

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.3.0...v3.3.1

Aug 19, 2025

What's Changed

feat(langchain): add update_trace argument by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1302

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.2.8...v3.3.0

Aug 18, 2025

What's Changed

fix(openai): handle async response api input and outputs by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1301

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.2.7...v3.2.8

Aug 15, 2025

What's Changed

fix(langchain): take only int values in parsed usage by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1299

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.2.6...v3.2.7

Aug 14, 2025

What's Changed

fix(client): skip string serialization in attribute values by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1297

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.2.5...v3.2.6

What's Changed

chore: specify otlp http exporter dep by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1295

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.2.4...v3.2.5

Aug 12, 2025

What's Changed

chore(deps-dev): bump starlette from 0.40.0 to 0.47.2 by @dependabot[bot] in https://github.com/langfuse/langfuse-python/pull/1274
chore: remove unnecessary deps by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1285
fix(client): add warning message if OTEL_SDK_DISABLED by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1291
chore(deps): bump openai from 1.99.5 to 1.99.6 by @dependabot[bot] in https://github.com/langfuse/langfuse-python/pull/1287
fix(langchain): keep trace attributes on non-chain llm runs by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1293
feat(openai): add support for response.parse by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1292

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.2.3...v3.2.4

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Latest

v4.4.0b1

Source

@langfuse/langfuse-python

Tracking Since

Jan 27, 2025

Last fetched Apr 19, 2026

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