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docs: point the README at the v5 SDK and its migration guide #2009

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docs: point the README at the v5 SDK and its migration guide
jayfeng7 Oct 15, 2026
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Merge branch 'main' into docs/readme-point-at-v5-migration
jayfeng7 Oct 19, 2026
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Merge branch 'main' into docs/readme-point-at-v5-migration
jayfeng7 Oct 21, 2026
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Merge branch 'main' into docs/readme-point-at-v5-migration
jayfeng7 Oct 21, 2026
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Merge branch 'main' into docs/readme-point-at-v5-migration
jayfeng7 Oct 21, 2026
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Merge branch 'main' into docs/readme-point-at-v5-migration
jayfeng7 Oct 22, 2026
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Merge branch 'main' into docs/readme-point-at-v5-migration
jayfeng7 Oct 22, 2026
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6 changes: 3 additions & 3 deletions README.md
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Expand Up @@ -10,11 +10,11 @@
[![YC W23](https://img.shields.io/badge/Y%20Combinator-W23-orange?style=flat-square)](https://www.ycombinator.com/companies/langfuse)

> [!IMPORTANT]
> The SDK was rewritten in v4 and released in March 2026. Refer to the [v4 migration guide](https://langfuse.com/docs/observability/sdk/upgrade-path/python-v3-to-v4) for instructions on updating your code.
> The SDK was rewritten in v4 and released in March 2026, and v5 was released in October 2026. Refer to the [v5 migration guide](https://langfuse.com/docs/observability/sdk/upgrade-path/python-v4-to-v5) for instructions on updating your code.
>
> **This is the latest Langfuse Python SDK (v4, OpenTelemetry).** The legacy v2 client API (`trace()`, `span()`, `generation()`, `api.trace.list`) is **deprecated**. Do **not** use it for new instrumentation.
> **This is the latest Langfuse Python SDK (v5, OpenTelemetry).** The legacy v2 client API (`trace()`, `span()`, `generation()`, `api.trace.list`) is **deprecated**. Do **not** use it for new instrumentation.
>
> **Latest Python SDK (OpenTelemetry):** `pip install langfuse`. Use `get_client()` + `start_as_current_observation` / `@observe`. Prompts/datasets/scores: the same `langfuse` package. Docs: https://langfuse.com/docs/observability/sdk/overview. Upgrade: [v2 to v3](https://langfuse.com/docs/observability/sdk/upgrade-path/python-v2-to-v3), [v3 to v4](https://langfuse.com/docs/observability/sdk/upgrade-path/python-v3-to-v4).
> **Latest Python SDK (OpenTelemetry):** `pip install langfuse`. Use `get_client()` + `start_as_current_observation` / `@observe`. Prompts/datasets/scores: the same `langfuse` package. Docs: https://langfuse.com/docs/observability/sdk/overview. Upgrade: [v2 to v3](https://langfuse.com/docs/observability/sdk/upgrade-path/python-v2-to-v3), [v3 to v4](https://langfuse.com/docs/observability/sdk/upgrade-path/python-v3-to-v4), [v4 to v5](https://langfuse.com/docs/observability/sdk/upgrade-path/python-v4-to-v5).
>
> Query traces with [Observations API v2](https://langfuse.com/docs/api-and-data-platform/features/observations-api) (`GET /api/public/v2/observations`, [API reference](https://api.reference.langfuse.com/#tag/observationsv2)), not `GET /api/public/traces` / `api.trace.list`.
>
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